Answers
The reaction force exerted by m₁ is 118.4 N.
Mass of the upper block, m₁ = 8 kg
Mass of the lower block, m₂ = 15 kg
Acceleration, a = 5 m/s₂
The normal reaction force is the force that the surfaces provide to stop solid objects from passing through one another. In touch, normal force is a force. Two surfaces cannot exert a normal force on one another if they are not in contact.
The force exerted by m₁ is,
F₁ = m₁(g + a)
F₁ = 8(9.8 + 5)
F₁ = 118.4 N
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Related Questions
when an objects speed goes up,the kinetic energy goes…
Answers
[tex]k.e. = \frac{1}{2} m {v}^{2} [/tex]
when the speed (v) goes up, the kinetic energy goes up as well.
Kinetic energy is the energy that an object possesses due to its motion. The formula for kinetic energy is:
kinetic energy = (1/2) x mass x velocity^2
As you can see from the formula, kinetic energy is directly proportional to the square of the velocity. This means that as the velocity of an object increases, the kinetic energy also increases. Conversely, if the velocity of an object decreases, the kinetic energy decreases as well.
A 90.0 kg man climbs up
a rope. At the top, his
potential energy is
8352.54 J. How high
does the man climb up
the rope?
Answers
From the given data and calculations, we can see that the man has climbed 9.46 meters
Given DataMass of the Man =90.0 kg Potential Energy at the Top of the rope = 8352.54 JHeight Climbed = ??We know that the expression for Man's potential energy at the top of the rope can be expressed as
P.E = mgh
Let us take acceleration due to gravity to be
g = 9.81 m/s^2
Substituting our given data into the expression and solving for h we have
8352.54 = 90*9.81*h
8352.54 = 882.9h
Dividing both sides by 882.9 we have
h = 8352.54/882.9
h = 9.46 meters
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object b is thrown straight up with an initial velocity v0. taking the upward direction as positive, select all the statements that describe the motion. (ignore air resistance.)
Answers
The statements that describe the motion are "The initial velocity is positive in the upward direction.", "The object's velocity decreases as it moves upward.", etc.
When object B is thrown straight up with an initial velocity v0, taking the upward direction as positive:
1. Its initial velocity is positive (v0 > 0) in the upward direction.
2. The acceleration due to gravity acts downward, making it negative (a = -g, where g is approximately 9.8 m/s²).
3. As the object moves upward, its velocity decreases due to the negative acceleration.
4. At the highest point, the object's velocity becomes momentarily zero (v = 0) before it starts falling back down.
5. The object's motion can be described using the kinematic equations, with the initial velocity v0 and acceleration -g.
Select all the statements that describe the motion:
- The initial velocity is positive in the upward direction.
- The acceleration due to gravity is negative.
- The object's velocity decreases as it moves upward.
- The object's velocity is momentarily zero at its highest point.
- Kinematic equations can be used to describe the object's motion.
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A starter cord for a generator is 1 m long. It is wound onto a drum with a diameter of 10 cm. A person starts the generator by pulling with a force of 100 N. A) What torque does he apply to the engine? b) How much work does he do?
Answers
A) To find the torque that the person applies to the engine, we need to first find the force applied at the edge of the drum. We can do this using the formula:
Force = Torque / Radius
where the radius is half the diameter of the drum.
Radius = 10 cm / 2 = 0.05 m
Force = 100 N
Therefore:
Torque = Force x Radius = 100 N x 0.05 m = 5 Nm
So the person applies a torque of 5 Nm to the engine.
B) To find the work done by the person, we need to use the formula:
Work = Force x Distance
where the distance is the length of the starter cord that is pulled out.
Length of cord = 1 m
Since the cord is wound around the drum, the distance that the person pulls is equal to the distance that the drum rotates. The circumference of the drum is:
Circumference = π x diameter = π x 10 cm = 0.314 m
So the distance that the person pulls is 0.314 m.
Therefore:
Work = Force x Distance = 100 N x 0.314 m = 31.4 J
So the person does 31.4 Joules of work
Torque = force x radius
The radius of the drum is half of its diameter, or 0.05 m. Therefore:
Torque = 100 N x 0.05 m = 5 Nm
B) To calculate the work done by the person, we need to know the distance the cord is pulled. Since the cord is 1 m long, and it is wound around the drum once, the distance it is pulled is equal to the circumference of the drum. The circumference can be calculated as follows:
Circumference = pi x diameter
Circumference = 3.14 x 0.1 m = 0.314 m
Therefore, the work done by the person is:
Work = force x distance
Work = 100 N x 0.314 m = 31.4 J
The person does 31.4 Joules of work to start the generator.
for strain measurement, we want to achieve the accuracy of 10-6. for instance, for a 1-cm-long specimen, we need to detect its length change as small as 10-8 m, i.e. 10 nm. assume the gauge factor (gf) of a strain gauge is 2. by using a wheatstone bridge, we measure the resistance change of the strain gauge (dr/r) to calculate the strain (dl/l). the smallest electrical resistance change that we can measure is 2x10-4 ohm. (a) how large does the initial resistance of strain gauge (r) need to be, so that our resistance measurement resolution (2x10-4 ohm) is sufficient for the strain measurement? (b) if the strain gauge is made of constantan and the wire diameter is 0.025 mm, how long should the wire be? hint: the resistivity of constantan is 49x10-8 wm. (c) how can this long wire be arranged to measure the average strain of a 1x1 cm small area?
Answers
(a) To achieve a resolution of 2x10-4 ohm, the initial resistance of the strain gauge must be at least 1x10⁸ ohm (2x10-4 ohm / (2 x 10⁻⁶)).
What is initial resistance?Initial resistance is the resistance to a change when it is first proposed. This resistance usually arises from a lack of trust or understanding of the proposed change, and can manifest itself in the form of skepticism, questioning, or even outright refusal. When faced with initial resistance, it is important to listen to the concerns of those who are resistant, and to provide evidence and information to help them understand the potential benefits of the proposed change. Through this process, it may be possible to win over resistant individuals and encourage them to embrace the change.
(b) The length of the wire can be calculated using the formula: Length = (Resistance * Resistivity) / (Wire Diameter). Plugging in the given values, we get: Length = (1x10⁸ ohm * 49x10-8 wm) / (0.025 mm) = 19.6 m
(c) To measure the average strain of a 1x1 cm small area, the 19.6 m wire can be arranged in a grid pattern, with each side of the grid measuring 1 cm. Then the strain gauge can be attached to the grid to measure the average strain of the area.
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the levels of radiation detected by a geiger counter when brought near a sample of radium. the amount of radiation it takes to activate a polyethylene container (turn it radioactive). the amount of radiation to which an airplane passenger is exposed on a transcontinental flight. the total amount of radiation a spacecraft computer chip can withstand before failing because of radiation damage
Answers
Radium generates high radiation levels, while polyethylene resists activation.
When a geiger counter is brought near a sample of radium, it will detect relatively high levels of radiation. Radium is a highly radioactive element, emitting alpha, beta, and gamma radiation.
The geiger counter measures these emissions and provides a reading indicating the intensity of radiation.
The amount of radiation required to activate a polyethylene container, turning it radioactive, is dependent on various factors, such as the thickness and composition of the container.
However, polyethylene is generally considered a poor candidate for activation through radiation exposure, as it is relatively resistant to becoming radioactive.
During a transcontinental flight, an airplane passenger is exposed to cosmic radiation, primarily in the form of high-energy cosmic rays. The exact amount of exposure varies based on factors like altitude, flight duration, and the flight path taken.
However, the level of radiation exposure during a typical transcontinental flight is generally considered low and poses no significant health risks.
The total amount of radiation a spacecraft computer chip can withstand before failing due to radiation damage depends on the chip's design and the radiation-hardening techniques employed.
Specialized chips used in spacecraft are typically designed to withstand higher levels of radiation than commercial chips. They can tolerate radiation doses ranging from several thousand to millions of grays, depending on the specific chip and its protective measures.
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Hurricanes that hit the east coast of the United States often start as low-pressure systems off the west coast of Africa. Which global winds move these hurricanes toward the United States?
A.
polar easterlies
B.
prevailing westerlies
C.
northeast trade winds
D.
southeast trade winds
Answers
Hurricane propagation is the process through which a hurricane moves from one location to another.
Winds from throughout the world direct hurricanes. The environmental wind field, commonly referred to as the dominant winds, is what directs a cyclone along its course. The hurricane moves in the direction of this wind field, which affects the hurricane's speed of movement.
The northeast trade winds move these hurricanes toward the United States.
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consider the force between the sun and the earth. if the sun suddenly moves two times farther away and also doubles its mass, the force, ____________
Answers
The overall effect is that the force between the sun and earth decreases by a factor of 4.
The force between the sun and the earth would decrease by a factor of 4. This is because the force of gravity between two objects is directly proportional to the mass of each object and inversely proportional to the square of the distance between them. So, if the distance between the sun and earth is doubled, the force of gravity decreases by a factor of 2 squared (or 4). However, since the sun's mass doubles, the force of gravity increases by a factor of 2.
Considering the force between the Sun and the Earth, if the Sun suddenly moves two times farther away and also doubles its mass, the force will be reduced to one-fourth of its original value. This is explained using Newton's Law of Universal Gravitation:
F = G * (m1 * m2) /[tex]r^2[/tex]
Where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses of the Sun and Earth respectively, and r is the distance between them.
When the Sun's mass doubles and the distance is doubled, the equation becomes:
F' = G * (2m1 * m2) / [tex](2r)^2[/tex]
F' = (G * 2m1 * m2) / [tex](4r^2)[/tex]
F' = (1/2) * (G * m1 * m2) /[tex]r^2[/tex]
F' = 1/4 * F
So, the new force (F') is one-fourth of the original force (F).
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A friend of yours tells you that they saw the constellation Orion high in the sky at 4 a.m. this morning. You are not particularly interested in getting out of bed so early. How many months will you have to wait until you can see Orion in the same place in the sky at midnight?
Answers
You'll have to wait for 2 months to see the constellation Orion in the same place in the sky at midnight.
To determine how many months you have to wait until you can see the constellation Orion in the same place in the sky at midnight, we can consider that constellations appear to shift westward about 4 minutes per day due to Earth's orbit around the Sun. Since there are 24 hours in a day, this amounts to a 2-hour shift in the sky each month (24 hours * 4 minutes = 2 hours).
Currently, Orion is visible at 4 a.m., which is 4 hours earlier than midnight. To see Orion at midnight, we need it to shift 4 hours westward. With a 2-hour shift each month, it will take 2 months for Orion to be in the same position at midnight (4 hours / 2 hours per month = 2 months).
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the position vector r of a particle points along the positive direction of the z axis. in what direction is the force producing the torque, if the torque on the particle is (a) zero, (b) in the negative x direction, and (c) in the negative y direction?
Answers
If the position vector r of particle points along the positive direction of the z-axis, the particle is located above the xy-plane. then answers are given below
(a) If the torque on the particle is zero, then the force producing the torque must be perpendicular to the z-axis, i.e., it lies in the xy-plane.
(b) If the torque on the particle is in the negative x-direction, then the force producing the torque must be in the negative y-direction, i.e., it lies in the xy-plane and is perpendicular to the position vector r.
(c) If the torque on the particle is in the negative y-direction, then the force producing the torque must be in the positive x-direction, i.e., it lies in the xy-plane and is perpendicular to both the position vector r and the force producing the torque in part (b).
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N2o (oxygen is terminal) draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons
Answers
In this structure, there are three atoms: two nitrogen (N) atoms and one oxygen (O) atom. The oxygen atom is terminal, meaning it is not bonded to any other atom beyond the nitrogen atoms.
The oxygen atom has two lone pairs of electrons, which are also not involved in any bonding.
N
/
/
N
|
O
A lone pair refers to a pair of valence electrons that are not involved in chemical bonding. These electrons are typically located in the outermost energy level of an atom, also known as the valence shell. Lone pairs play an important role in determining the reactivity and properties of molecules. For example, the presence of lone pairs can affect the shape of a molecule, which in turn affects its polarity and ability to interact with other molecules.
Lone pairs are often depicted as pairs of dots next to the symbol of the atom in a Lewis structure diagram. In some cases, lone pairs can participate in chemical reactions, such as in the formation of coordinate covalent bonds. However, in most cases, they are unreactive and do not participate in chemical bonding.
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a) The object is placed at a distance in front of the mirror which is a multiple of the magnitude of the focal length, d0=NF, where N is a positive integer. Recall that the focal length is given by −F where F is explicitly positive. Enter an expression for the magnitude of the distance between the image and the mirror.
b) The object remains at a distance in front of the mirror which is a multiple of the magnitude of the focal length, d0=NF, where N is a positive integer. Recall that the focal length is given by −F where F is explicitly positive. If the positive height of the object is h0, enter an expression for the magnitude of the image height, |hi|. Your expression will contain the object height.
Answers
The expression for the magnitude of the distance between the image and the mirror is di = d0/(N+1) and an expression for the magnitude of the image height is |hi| = (h0F)/(d0-F).
a) When an object is placed at a distance in front of a mirror that is a multiple of the magnitude of the focal length, d0=NF, where N is a positive integer, the image formed is a real and inverted image.
The distance between the image and the mirror can be focal length using the formula:
di = d0/(N+1)
where di is the distance between the image and the mirror.
b) If the object remains at a distance in front of the mirror which is a multiple of the magnitude of the focal length, d0=NF, where N is a positive integer, the image formed is a real and inverted image.
The magnitude of the image height, |hi|, can be calculated using the formula:
|hi| = (h0F)/(d0-F)
where h0 is the positive height of the object and d0 is the distance between the object and the mirror, which is a multiple of the magnitude of the focal length.
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an engineer is considering possible trajectories to use for emergency descent of a lunar module from low moon orbit to the lunar surface and decides to investigate one for which the vertical component of velocity as a function of time is described by vy(t)
Answers
The engineer is analyzing the possible trajectories to use for an emergency descent of a lunar module from low moon orbit to the lunar surface.
One of the trajectories that the engineer is considering involves studying the vertical component of velocity as a function of time, which is described by vy(t).
This information is essential because it helps the engineer determine the appropriate speed at which the lunar module should descend to ensure a safe landing on the lunar surface.
By analyzing the vertical component of velocity, the engineer can determine the maximum velocity at which the lunar module can safely descend without causing any damage or risking the safety of the astronauts on board.
This analysis is crucial as it helps the engineer make informed decisions about the trajectory to use, ensuring the success of the mission and the safety of the crew.
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PART OF WRITTEN EXAMINATION:
when using a digital meter, the reference electrode is
connected to
A) nothing
B) the positive side
C) depends
D) the negative terminal to obtain the proper polarity
reading.
Answers
When using a digital meter, the reference electrode is connected to D) the negative terminal to obtain the proper polarity reading. A reference electrode is used in electrochemistry to measure the potential difference between a working electrode and the solution.
In order to obtain accurate measurements, it is important to establish a consistent reference point. This is achieved by connecting the reference electrode to the negative terminal of the meter, which is also known as the ground or common terminal.
By connecting the reference electrode to the negative terminal, the polarity of the potential difference is established. The positive side of the meter is then connected to the working electrode, which allows for the measurement of the potential difference between the two electrodes.
It is important to note that different types of reference electrodes may require different connections to the meter. Therefore, it is important to consult the manufacturer's instructions or reference materials to ensure proper use of the reference electrode.
In conclusion, when using a digital meter for electrochemical measurements, it is necessary to connect the reference electrode to the negative terminal to establish a consistent reference point and proper polarity reading.
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PART OF WRITTEN EXAMINATION:
maintain a constant magnitude and direction
A) telluric currents
B) dynmaic stray currents
C) steady state stray currents
Answers
The phrase "maintain a constant magnitude and direction" refers to a specific characteristic of electrical currents. In this context, magnitude refers to the strength or intensity of the current, while direction refers to the path the current is flowing.
In order for a current to maintain a constant magnitude and direction, it must remain steady and not fluctuate.Out of the options provided, the type of current that best fits this description is steady state stray currents. These are low-frequency currents that flow through conductive materials without any intentional circuitry. Unlike dynamic stray currents, which are constantly changing and unpredictable, steady state stray currents maintain a relatively consistent magnitude and direction. Telluric currents, on the other hand, are natural currents that flow through the Earth's crust and can be influenced by factors such as weather and geological activity.In summary, when a current is said to maintain a constant magnitude and direction, it means that it remains steady and predictable. Out of the options given, steady state stray currents best fit this description.
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which of the following accurately describe some aspect of gravitational waves? select all the statements that are true. -The existence of gravitational waves is predicted by Einstein's general theory of relativity.
-The first direct detection of gravitational waves came in 2015.
-Gravitational waves carry energy away from their sources of emission.
-Gravitational waves are predicted to travel through space at the speed of light.
Answers
All of the provided statements are true and accurately describe various aspects of gravitational waves.
Here are the statements that accurately describe some aspects of gravitational waves:
1. The existence of gravitational waves is predicted by Einstein's general theory of relativity.
2. The first direct detection of gravitational waves came in 2015.
3. Gravitational waves carry energy away from their sources of emission.
4. Gravitational waves are predicted to travel through space at the speed of light.
All of the provided statements are true and accurately describe various aspects of gravitational waves.
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what is the cost of operating a 86.13-watt freezer for a month if the cost of electricity is $ 0.02 per kwh? assume we take a month as 30 days. g
Answers
The cost of operating a 86.13-watt freezer for a month, assuming the cost of electricity is $0.02 per kilowatt-hour and a month has 30 days, would be $1.24.
To calculate the cost of operating a 86.13-watt freezer for a month, we need to first calculate the amount of energy it consumes in a month. We know that the power rating of the freezer is 86.13 watts, which means it consumes 0.08613 kilowatts of electricity every hour. In a day, the freezer would consume 2.07 kilowatt-hours (0.08613 kW x 24 hours). For a 30-day month, the total energy consumption would be 62.1 kilowatt-hours (2.07 kW x 30 days).
Now that we know the total energy consumption, we can calculate the cost of electricity. The cost of electricity is $0.02 per kilowatt-hour, which means the cost of operating the freezer for a month would be 62.1 kilowatt-hours x $0.02 per kilowatt-hour = $1.24.
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The product of a wave's frequency and its period is
A: one
B: its velocity
C: its wavelength
D: Planck's constant
Answers
The product of a Wave's frequency and its period is related to its velocity. The frequency of a wave is the number of complete cycles of the wave that occur in one second. The period of a wave is the time it takes for one complete cycle to occur. The velocity of a wave is the speed at which the wave travels.
The product of a wave's frequency and its period is equal to one, as stated in option A. However, this is not the correct answer to the question. its velocity This is because the velocity of a wave is equal to its frequency multiplied by its wavelength. Since the product of frequency and period is equal to one, we can rewrite the equation as: velocity = frequency x wavelength the product of a wave's frequency and its period is related to its velocity.
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Two objects, object X and Object Y, are held together by a light string
Answers
For the Object 4s, a graph of the acceleration for the system's centre of mass as a function of time is displayed. The upward direction is regarded as the good direction. After falling for 4 seconds, the speed of item X is calculated as vx=vs by comparing its speed to that of the system. Option c is Correct.
Two items, object X and object Y, are released from rest near a planet's surface in the configuration depicted in the image while being connected by a light string.
Object X is heavier than Object Y in mass. The findings for the magnitude of the acceleration and the velocity of the bodies, according to Newton's second law, are as follows: All bodies accelerate at the same rate. Option c is Correct.
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Correct Question:
Two objects, object X and object Y, are held together by a light string and are released from rest near a planet's surface in the orientation that is shown in the figure. Object X has a greater mass than object Y. A graph of the acceleration as a function of time for the system's center of mass is shown for the 4s. The positive direction is considered to be upward. How does the speed of object X vx compare to that of the system's speed vs after the objects have fallen for 4s ?
a transformer with 4 turns in its primary coil and 20 coils in its secondary coil is connected to a 5 volt battery on its primary side. how much is the voltage raised to on the secondary side? a transformer with 4 turns in its primary coil and 20 coils in its secondary coil is connected to a 5 volt battery on its primary side. how much is the voltage raised to on the secondary side? 0 volts, transformers only work for ac voltage sources 25 volts 4 volts 1 volt
Answers
When a transformer with 4 turns in its primary coil and 20 coils in its secondary coil is connected to a 5 volt battery on its primary side, the voltage is raised to 25 volts on the secondary side.
Transformers work on the principle of electromagnetic induction, where a changing magnetic field in the primary coil induces a voltage in the secondary coil. The voltage is determined by the ratio of the number of turns in the secondary coil to the number of turns in the primary coil. In this case, the ratio is 20:4 or 5:1, which means the voltage is raised to 5 times the input voltage of 5 volts, which is 25 volts. It is important to note that transformers only work with AC voltage sources, not DC sources like batteries.
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A bomb, initially at rest, explodes into several pieces.
(a) Is linear momentum of the system (the bomb before the explosion, the pieces after the explosion) conserved?
Yes
No
insufficient information
Answers
The linear momentum of the system the bomb before the explosion, the piece after the explosion is conserved. Therefore, while linear momentum is conserved, other forms of energy are not.
The explosion, the bomb was at rest, so its momentum was zero. After the explosion, the pieces will move in different directions with different velocities, but the sum of their momenta will still be zero. This means that the total momentum of the system is conserved. However, it should be noted that the kinetic energy of the system is not conserved as some of it is lost in the form of heat, sound, and other forms of energy during the explosion. Therefore, while linear momentum is conserved, other forms of energy are not.
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a -3.0 c charge and a 2.0 c charge are placed 0.60 m apart. part a (1 points) what is the magnitude of the electric dipole moment of this charge distribution?
Answers
The magnitude of the electric dipole moment of this charge distribution is 1.2 C⋅m.
What is the magnitude of the electric dipole moment of a charge distribution?The electric dipole moment of a charge distribution is defined as the product of the magnitude of the charge and the distance between the charges multiplied by a unit vector pointing from the negative charge to the positive charge.
In this case, we have a -3.0 C charge and a 2.0 C charge placed 0.60 m apart. Let's assume that the -3.0 C charge is located at the origin and the 2.0 C charge is located at a point (0.60, 0).
The magnitude of the electric dipole moment can be calculated as:
p =q * d
where q is the magnitude of the charge and d is the distance between the charges.
In this case, q = 2.0C and d = 0.60m
Therefore:
p =(2.0C) * (0.60m)p = 1.2C.m
So the magnitude of the electric dipole moment of this charge distribution is 1.2 C⋅m.
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If it takes total work W to give an object a speed v and ki- netic energy K, starting from rest, what will be the object’s speed (in terms of v) and kinetic energy (in terms of K) if we do twice as much work on it, again starting from rest?
Answers
The object's new kinetic energy is twice its original kinetic energy.
K = (1/2)mv² (1)
W = K (2)
If we do twice as much work on the object, the new total work done on the object, W', is given by:
W' = 2W
Using equation (2), we can say that the new kinetic energy of the object, K', is:
K' = W' = 2W
Substituting this expression for K' into equation (1), we get:
K' = (1/2)mv'²
where v' is the new speed of the object. Substituting K' = 2W and solving for v', we get
v' = √(4W/m)
Thus, the object's new speed is twice its original speed:
v' = 2v
Substituting K' = 2W into equation (2), we get:
2W = (1/2)mv'²
Substituting v' = 2v, we get:
2W = (1/2)m(4v²)
Simplifying this expression, we get:
K' = 2K
Kinetic energy is a type of energy that an object possesses by virtue of its motion. In physics, it is defined as the energy an object possesses due to its motion relative to another object or reference frame. The formula for kinetic energy is 1/2 mv², where m is the mass of the object and v is its velocity. Kinetic energy is a scalar quantity, meaning it has only magnitude and no direction.
The kinetic energy of an object increases as its mass or velocity increases. This means that a heavier object moving at the same speed as a lighter object has more kinetic energy. Similarly, an object moving at a higher velocity has more kinetic energy than the same object moving at a lower velocity. Kinetic energy is a fundamental concept in physics and is used to explain many phenomena, including the behavior of particles in motion, the motion of vehicles, and the conversion of energy from one form to another. It is also a key concept in engineering, where it is used to design and optimize machines that rely on the motion.
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Will mark brainliest! See images below, please help! AP Physics
Answers
Student 1 is correct in stating that the gravitational force is an external force acting on the marble while it is in the air. However, their claim that the cannon exerts a force on the marble in the air is incorrect, as the only external force acting on the marble in the air is due to gravity. As a result, the mechanical energy of the marble is conserved while it is in the air.
Mechanical energy is the sum of potential energy and kinetic energy in a system. Potential energy is the energy an object possesses due to its position or configuration, while kinetic energy is the energy an object possesses due to its motion. In the context of this question, the mechanical energy of the marble after it has been launched by the cannon but before it reaches the ground refers to the sum of the potential and kinetic energy of the marble in the air. Since there is no air resistance, the mechanical energy of the marble is conserved while it is in the air.
(e) The underlined phrase "the gravitational force" is correct in student 1's statement.
(f) The underlined phrase "the force exerted by the cannon" is incorrect in Student 1's statement. The cannon does exert a force on the marble during launch, but once the marble is in the air, there is no force exerted by the cannon on the marble. The force on the marble in the air is due only to gravity, which is an external force. So, the mechanical energy of the marble is conserved while it is in the air.
Therefore, Inferring that the gravitational force is an outside force operating on the marble while it is in the air, Student 1 is accurate. The stone in the air is solely subject to the force of gravity; they are mistaken when they assert that the cannon also exerts a force on it. The marble's mechanical energy is thus kept in check while it is in the air.
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A magnetic object is shown here, recently broken into two pieces. The region at the point labeled "a" is the positive end of the
original magnet. Which questions are relevant to ask with regard to the magnetic object shown here? Select ALL that apply (Choose
2)
A)
8)
C
6
Dj
G
Do "a" and "d" repel each other?
Do "b" and "c" attract to each other?
Are "b' and 'e' both negative ends of the new objects?
Are "a" and "e" both positive ends of the new objects?
Do "b" and "d" create an electric current when in proximity to each other?
Answers
The relevant questions to ask with regard to the magnetic object are options B and D:
Are "b" and "c" attract to each other?
Are "a" and "e" both positive ends of the new objects?
What makes an object magnetic?When electrons in an item spin in the same direction, they form a net magnetic field. When you magnetize something, the spinning electrons align and generate a powerful magnetic field. The magnetic properties of a material are governed by its atomic and molecular structure, as well as external effects such as temperature and magnetic fields.
Some materials, such as iron, nickel, and cobalt, are magnetic by nature, whereas others may be magnetized by a number of means, such as exposure to high magnetic fields or electric currents.
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The solid cylinder and cylindrical shell in the figure have the same mass, same radius, and turn on frictionless, horizontal axles. (The cylindrical shell has lightweight spokes connecting the shell to the axle.) A rope is wrapped around each cylinder and tied to a block. The blocks have the same mass and are held the same height above the ground. Both blocks are released simultaneously. Which hits the ground first? Or is it a tie? Must explain why
Answers
The solid cylinder and cylindrical shell have the same mass, and radius, and turn-on frictionless, horizontal axles. Both blocks tied to the ropes also have the same mass and are held at the same height above the ground.
When released simultaneously, the block tied to the solid cylinder will hit the ground first. This is because the solid cylinder has a larger moment of inertia compared to the cylindrical shell. The moment of inertia for a solid cylinder is (1/2), while for a cylindrical shell, it is MR^2, where M is the mass and R is the radius. Since the solid cylinder has a larger moment of inertia, it will take more time to accelerate and rotate, causing the block tied to it to fall faster. Therefore, the block tied to the solid cylinder will hit the ground first.
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A wheel of radius 15cm has a rotational inertia of 2.3 kg.m^2. The 0/5 wheel is spinning at a rate of 6.5 revolutions per second. A frictional force is applied tangentially to the wheel to bring it to a stop. The work done by the torque to stop the wheel is most nearly * A. Zero B.-50 J C.-100 J D.-1920J E. -3840 J.
Answers
The work done by the torque to stop the wheel can be calculated using the formula:
Work = Change in rotational kinetic energy
The initial rotational kinetic energy of the wheel can be calculated using the formula:
Rotational kinetic energy = 1/2 * rotational inertia * angular velocity^2
Plugging in the given values, we get:
Rotational kinetic energy = 1/2 * 2.3 kg.m^2 * (2π * 6.5 rev/s)^2
= 1/2 * 2.3 kg.m^2 * (2π * 6.5/60 rad/s)^2 (since 1 revolution = 2π radians)
= 16.54 J
The final rotational kinetic energy of the wheel is zero since it has been brought to a stop.
Therefore, the work done by the torque to stop the wheel is:
Work = Change in rotational kinetic energy
= Final rotational kinetic energy - Initial rotational kinetic energy
= 0 - 16.54 J
= -16.54 J
Note that the negative sign indicates that the work done by the torque is in the opposite direction of the applied force (i.e., it is dissipative). Therefore, the answer is E. -3840 J is not a possible answer since work done cannot be negative in such a scenario.
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select all the options that correctly describe the radial probability distribution plot of the electron in the ground-state hydrogen atom.
Answers
The radial probability distribution plot for the ground-state hydrogen atom shows the highest probability of finding the electron near the nucleus, with no radial nodes. The electron occupies the 1s orbital, and the radial distribution function indicates a single maximum.
The radial probability distribution plot for the electron in the ground-state hydrogen atom can be best understood by considering the following terms:
1. Ground-state hydrogen atom: This refers to the lowest energy state of the hydrogen atom, in which the electron occupies the n=1 energy level. In this state, the electron is closest to the nucleus and has the least energy.
2. Radial probability distribution: This is a graph that represents the probability of finding the electron at different distances from the nucleus. It accounts for both the size of the electron cloud (the volume it occupies) and the electron density within the cloud.
3. s-orbital: In the ground-state hydrogen atom, the electron is found in the 1s orbital. This spherically symmetrical orbital has the highest probability of electron presence at the center and decreases gradually as we move away from the nucleus.
4. Radial distribution function: This function describes the electron density as a function of distance from the nucleus. For the ground-state hydrogen atom, the radial distribution function shows a single maximum, indicating the highest probability of finding the electron near the nucleus.
5. Radial node: A radial node is a region in the radial probability distribution plot where the probability of finding an electron is zero. In the ground-state hydrogen atom, there are no radial nodes, as the electron is in the 1s orbital.
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Nicole is playing for her school hockey team. During the game she passes the ball to her teammate Josie, who is some distance away. To do this she has to raise the ball high enough to give it flight and low enough to keep it safe. She hits the ball with a velocity of 22ms–1 at an angle of 30°.
Answers
Nicole is playing for her school hockey team;
(a) Initial vertical velocity of the ball is 11 ms⁻¹.
(b) 42.98 m
(c) 2.25 s
How to find initial vertical velocity?(a) The initial velocity of the ball can be resolved into its horizontal and vertical components as follows:
Horizontal component: vx = v cos θ = 22 cos 30° = 19.1 ms⁻¹
Vertical component: vy = v sin θ = 22 sin 30° = 11 ms⁻¹
Therefore, the initial vertical velocity of the ball is 11 ms⁻¹.
(b) The ball's motion is defined as projectile motion, which is the movement of an item that is thrown or propelled into the air and subsequently moves solely under the effect of gravity.
The ball encounters two primary forces as it goes through the air: gravity, which operates vertically downwards and causes the ball to accelerate downhill at a rate of 9.81 ms⁻², and air resistance, which resists the motion of the ball and depends on its speed, shape, and size.
At any given time t, the ball has a horizontal displacement x and a vertical displacement y. The equations for these displacements are:
x = vx t
y = vy t - 0.5 g t²
where g = acceleration due to gravity.
As the ball reaches its maximum height, its vertical velocity becomes zero. The time taken to reach this maximum height can be found by setting vy = 0 in the second equation above:
0 = vy - g t_max
t_max = vy / g = 11 / 9.81 = 1.12 s
The maximum height reached by the ball, substitute this time into the second equation:
y_max = vy t_max - 0.5 g t_max² = 6.18 m
The total time of flight of the ball, y = 0 in the second equation above:
0 = vy t - 0.5 g t²
t = 2 vy / g = 2 x 11 / 9.81 = 2.25 s
Find horizontal range of ball by substituting this time into the first equation:
x = vx t = 19.1 x 2.25 = 42.98 m
(c) To determine whether the ball will reach Josie before it bounces, calculate the time taken for the ball to travel the 44 m distance and compare it with the total time of flight calculated in part (b). The time taken for the ball to travel a horizontal distance of 44 m is:
t = x / vx = 44 / 19.1 = 2.30 s
Since this time is greater than the total time of flight calculated in part (b), which is 2.25 s, the ball will not reach Josie before it bounces.
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a '29er' mounbtain bike wheel has a diameter of 29.0 in . what is the moment of inertia of this wheel (expressed in standard units)? the rim and tire have a combined mass of 0.850 kg . remember that 1in
Answers
The moment of inertia of the wheel is 0.0564 kg [tex]m^{2}[/tex]
To calculate the moment of inertia of the 29er mountain bike wheel, we need to know the mass distribution of the wheel. Let's assume that the mass of the wheel is concentrated in the rim and tire, which is a reasonable approximation.
The moment of inertia of a hoop (or a circular rim) is given by the formula:
I = \frac{1}{2} m r^{2}[/tex]
where I is the moment of inertia, m is the mass of the hoop, and r is the radius of the hoop. Since we know the diameter of the wheel is 29.0 inches, the radius is 14.5 inches (which is equal to 0.3683 meters, using the conversion factor you provided).
The mass of the rim and tire is given as 0.850 kg. To convert this mass to the mass of the hoop, we need to subtract the mass of the hub and spokes, which we do not have information about. Let's assume that the mass of the hub and spokes is negligible compared to the mass of the rim and tire. In this case, the mass of the hoop is equal to the mass of the rim and tire.
Therefore, the moment of inertia of the 29er mountain bike wheel is:
I = \frac{1}{2} m r^{2}[/tex]
= (1/2) * 0.850 kg * (0.3683 m)^2[tex]= \frac{1}{2} *0.850 kg * (0.3683)^{2} m\\= 0.0564kg m^{2}[/tex]
So the moment of inertia of the wheel is 0.0564 kg [tex]m^{2}[/tex], expressed in standard units.
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