Answer:
25.13274 W (WATT) (Sound Power of the Sound Source)
134.002 dB (Sound Power Level)
consider the prpositions p anmd q where pis you can paddle one canoe down the river and q is you can paddle one kayak down the river
The propositions P and Q are both true. P states that you can paddle one canoe down the river, and Q states that you can paddle one kayak down the river. Both of these activities are possible, making both statements true.
What is propositions?A proposition is a statement or assertion that expresses a judgment or opinion about a particular topic or issue. It is a type of argument used in logic and critical thinking, and is typically expressed in a declarative sentence. Propositions can be either true or false and can be used to support or reject a claim. In philosophy, propositions can also be used to explain and justify a particular belief or set of beliefs. Propositions are often used in academic and scientific discourse to communicate ideas and arguments in a concise and logical manner.
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Air moves across a warm body of water and rises in the atmosphere. This heat is most likely transmitted by which of the following? • Convection only • Radiation only • Convection and conduction • Radiation and conduction
This heat is most likely transmitted by Convection only. The first option is the correct answer.
What is Convection?Convection is the transfer of heat by the movement of a fluid or gas. When air moves across a warm body of water, it is heated by the water through convection and rises in the atmosphere. This process is called a sea breeze.
Heat convention in materials can be calculated using the formula:
Q = h A ΔT
Where,
Q = heat transfer rate
h = convection heat-transfer coefficient
A = exposed surface area
ΔT = temperature difference
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A 75-kg object traveling 25 m/s collides with and sticks to a 315-kg object initially at rest. What is the final velocity of the two objects?
19 m/s
12 m/s
4.8 m/s
2.9 m/s
The final velocity of the two objects is 4.8m/s.
What does the word "velocity" mean?
The displacement that an object or particle experiences with respect to time is expressed vectorially as velocity. The meter per second (m/s) is the accepted unit of velocity magnitude (also known as speed). Alternately, the magnitude of velocity can be expressed in centimeters per second (cm/s).
The change in velocity between the objects following a collision is known as the relative velocity. When particles collide, momentum and energy are transferred, which results in a change in velocity. It abides under the rule of conservation of energy and momentum.
m1 = 75kg
m2 = 75+315kg = 390kg
v1 = 25m/s
v2 = ?
Initial momentum = m1*v1
Final momentum = m2*v2
Initial momentum = Final momentum
m1v1 = m2v2
75*25 = 390 *v2
v2 = 75*25/390
v2 = 4.8m/s
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according to hfsd, multiplying the number of work-days (people-days) in an iteration by the velocity is necessary because:
Multiplying the number of work-days (people-days) in an iteration by the velocity is necessary in order to calculate the amount of work that can be completed in an iteration.
What is iteration?Iteration is a process in which a sequence of actions or steps is repeated to achieve an intended outcome. It is an efficient programming practice that helps to simplify complex tasks and achieve desired results. Iteration is also known as looping and is an integral part of computer programming. Iteration helps to repeat a set of instructions until a certain condition is met, saving time and effort. It is a powerful tool that can be used to solve complex problems and create efficient algorithms.
The velocity is a measure of how much work can be completed by a team in a given time frame, and thus multiplying it by the number of work-days in an iteration gives an indication of the total amount of work that can be completed in that iteration. This helps teams plan their work and set realistic expectations for what can be accomplished in a given iteration.
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A pendulum that consists of a 2kg mass swings a maximum vertical displacement of 10 cm above its rest position. At its lowest point, the KE of the mass is equal to
F. 0.196 J
G. 1.96 J
H. 19.6 J
J. 196 J
K. 1960 J
The kinetic energy at the lowest point is 1.96 Joule. The result is obtained by using the concept of Conservation of mechanical energy.
What is the conservation of mechanical energy?The Conservation of mechanical energy states that the total mechanical energy of a system is conserved. It can be expressed as
E initial = E final
KE₁ + U₁ = KE₂ + U₂
½mv₁ + mgh₁ = ½mv₂ + mgh₂
Where
E = mechanical energyKE = kinetic energyU = potential energym = mass of an objectv = speed of objecth = height of objectThe index 1 and 2 shows at point 1 (initial) and 2 (final).
A pendulum that consists of
m = 2 kgh max = 10 cm (0.1 m) above its rest position.At its lowest point, find kinetic energy!
The lowest point is at the mean position where h = 0.
Let's say, point 1 is at the highest point and point 2 is at the lowest point.
E initial = E final
½mv₁ + mgh₁ = ½mv₂ + mgh₂
At the highest, the speed is zero. h max means highest position. It would be
½m(0) + mgh₁ = ½mv₂ + mg(0)
mgh₁ = ½mv₂
U₁ = KE₂
The kinetic energy is
KE₂ = mgh₁
KE₂ = 2 (9.8) (0.1)
KE₂ = 1.96 Joule
Hence, the kinetic energy at the lowest point is 1.96 Joule.
The correct option is (G).
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a conducting bar moves to the left at a constant speed v on two conducting rails joined at the left as shown. as a result of the bar moving through a constant magnetic field, a current i is induced in the indicated direction. which one of the following directions is that of the magnetic field?
As a result of the bar moving through a constant magnetic field, a current i is induced in the indicated direction. The field is pointing downwards as a result of this.
Option E is correct.
How does a magnetic field work?A moving electric charge or an electric current can produce a magnetic field, which is a physical phenomenon. It is a field of force that is hard to see that surrounds an object and has the power to attract or repel other magnets. Tesla or Gauss units are used to measure magnetic field strength. Magnetic resonance imaging (MRI), electricity generation, and navigation are just a few examples of the many applications for magnetic fields.
The magnetic field is oriented out of the plane of the page and is perpendicular to the plane of the conducting rails. The field is pointing downwards as a result of this. If a compass needle were placed in the field, its north-seeking pole would point in the same direction as the current that was induced in the rails because of the field's direction.
Question incomplete:a conducting bar moves to the left at a constant speed v on two conducting rails joined at the left as shown. as a result of the bar moving through a constant magnetic field, a current i is induced in the indicated direction. which one of the following directions is that of the magnetic field?
A. towards the right
B. towards the left
C.parallel along the axis
D. into the page
E. out the page
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Two vectors ⃗
and ⃗
are shown in the figure. Vector ⃗
has a magnitude of =24.5
and an angle of =33.5∘.
Vector ⃗
has a magnitude of =46.9
and an angle of =57.5∘.
The figure is not to scale.
Express each vector in the figure using
unit vector notation,
⃗ =+
⃗ =+
where ,
,
,
and
are the calculated values of the
‑ and
‑components of vectors ⃗
and ⃗ ,
respectively.
A x y coordinate system with the positive x axis pointing horizontally to the right and the positive y axis pointing vertically upwards. Vector A extends from the origin into the first quadrant, has length r subscript A, and makes an angle theta subscript a with the positive x axis. Vector B extends from the origin into the third quadrant, has length r subscript b, and makes an angle theta subscript b with the negative x axis.
Explanation:
To express each vector in the figure using unit vector notation, we can use the following equations:
⃗ =
⃗ =
where is the x-component of the vector and is the y-component of the vector.
For vector :
x = 24.5cos(33.5) = 20.8
y = 24.5sin(33.5) = 14.2
So
⃗ =
For vector :
x = -46.9cos(57.5) = -31.8
y = -46.9sin(57.5) = -38.4
So
⃗ =
Note that the negative sign on the x-component of vector is due to the fact that it is in the third quadrant.
It is important to take into account that the angle provided on the question is in degrees, and in this case trigonometric functions are used to calculate the x and y component of the vector.
pls answer it
thanks
(a) The change in the length of the bar is 0.012 m.
(b) The new length of the bar is 10.012 m.
What is the change in length of the bar?The change in the length of the bar is calculated by applying the following formula.
ΔL = αLΔθ
where;
α is the linear expansivityL is the original length of the barΔθ is the change in lengthΔL = ( 24 x 10⁻⁶ x 10) x ( 40 - -10)
ΔL = ( 24 x 10⁻⁶ x 10) x ( 50)
ΔL = 0.012 m
The new length of the bar is calculated as follows;
L₁ = L + ΔL
L₁ = 10 m + 0.012 m
L₁ = 10.012 m
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Introduction to forces. Identify the situations that have an unbalanced force. Check all that apply.
The situations that have an unbalanced force are:
A. A baseball speeds up as it falls through the air D. A bumper car hit by another car moves off at an angleE. A balloon flies across the room when the air is released What are the forces about?These situations have an unbalanced force because in all of them an object is either accelerating (speeding up or changing direction) or moving with a force acting on it. In the first one, the baseball is accelerating due to gravity. In the second one, the bumper car is hit by another car and moves off at an angle. In the third one, the balloon flies across the room when the air is released, which is a force acting on it.
On the other hand, a soccer ball at rest on the ground and an ice skater gliding in a straight line at a constant speed, are both examples of balanced forces, as there is no net force acting on the objects and they are not accelerating.
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See full question below
Identify the situations that have an unbalanced force. Check all that apply. A baseball speeds up as it falls through the air. A soccer ball is at rest on the ground. An ice skater glides in a straight line at a constant speed. A bumper car hit by another car moves off at an angle. A balloon flies across the room when the air is released.
sunlight reflects from a concave piece of broken glass, converging to a point 15 cm from the glass. part a what is the radius of curvature of the glass? express your answer using two significant figure
The radius of curvature of the broken glass from a concave piece is calculated to be 30 cm.
As the Sun's light rays are parallel to one another, they focus into the concave piece of glass's focus, which is f = 15 cm, when it serves as a concave mirror and reflects them.
It is known that, the radius of curvature of a concave mirror is twice its focal length, so in this case it is,
Radius = 2 × Focal length = 2 × 15 = 30 cm.
Thus, the required radius of curvature of the broken glass from a concave piece is calculated to be 30 cm.
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1. Two balls with masses of 2.0kg and 60kg traveling at 12ms and 4.0 m/s, respectively. They have a
head-on inelastic collision (not perfectly). The 2.0kg moves in the opposite direction with a speed of 8.0
m/s.
a. Find the speed of the 6.0kg ball after the collision.
B. Find the KE for each ball before and after the collision
C. Find the amount of KE that is lost during the collision.
a) The speed of the 60 Kg ball is 4.1 m/s
b) The KE before and after collision is 144 J and 64 J respectively
c) The KE lost is 80 J
What is the momentum?We know that when we talk about the momentum, our minds would go to the collision of the objects that we have in this case which are the balls in the question.
a) Momentum before collision = Momentum after Collison
(2 * 12) + (4 * 60) = (8 * 2) + (60 * v)
v is the velocity of the 60Kg ball
24 + 240 = 16 + 60v
v = 4.1 m/s
b) KE before collision
1) 0.5 * 2 * (12)^2 = 144 J
2) 0.5 * 60 * 4^2 = 480 J
KE after collision;
1) 0.5 * 2 * 8^2 = 64 J
2) 0.5 * 60 * (4.1)^2 = 504.3 J
c) The KE lost in the collision is; 144 J - 64 J = 80 J
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examine the graphs below, which show salinity, temperature, and density with depth from the atlantic ocean. which letter on the graphs represents the halocline?
Of the five oceans, the Atlantic Ocean has the highest salinity. Near the equator and at both poles, salinity clearly decreases.
The amount of dissolved salts in water is known as salinity. This explains not just sodium chloride but all salts (table salt). Because salinity interferes with nitrate uptake, stunts development, and prevents plant reproduction, it has an impact on the production of pastures, trees, and crops. Some ions, most notably chloride, are poisonous to plants, and when their concentration rises, the plant becomes poisoned and perishes.
Due to changes in solar radiation and the physical characteristics of water, the temperature of ocean water fluctuates depending on location, both in terms of latitude and depth. The majority of the lightest water in the Pacific has densities under 26.0, while the majority of the densest water in the Atlantic has densities between 27.5 and 28.0.
A halocline is a layer that separates two water masses by difference in density, albeit it does not occur because of temperature this time. When two bodies of water—one containing freshwater and the other saltwater—converge, it happens.
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during the spin cycle, a clothes washer, with a radius of 1.5 feet, rotates at a rate of four revolutions per second when at maximum speed. if the velocity of the outside wall of the washer follows the function ft/s when starting from rest, determine the time it takes to get the washer to maximum speed. also, find the magnitude of the acceleration of the outside wall the instant before it reaches maximum speed. (7.54 s, 948 ft/s^2)
The magnitude of the acceleration of the outside wall the instant before it reaches maximum speed is 948 ft/s^2.
What is acceleration?Acceleration is the rate of change of velocity over time. It is the increase in speed or the decrease in the time taken to cover a particular distance.
The equation describing the velocity of the outside wall of the washer is a linear one, given by the equation:
v(t) = at
where a is the acceleration of the wall and t is the time.
We know that the velocity of the wall when it reaches maximum speed is 4 revolutions per second. We can convert this to linear velocity by multiplying it by the circumference of the washer, 2πr, where r is the radius of the washer (1.5 feet). This gives us a final velocity of 9π ft/s
We can now solve for the acceleration of the wall. We know the final velocity and we can set the initial velocity to 0 due to the fact that the washer is starting from rest. So we can solve for the acceleration using the equation:
a = v(t) / t
Plugging in our values, we get:
a = 9π ft/s / t
Now we can solve for the time it takes to get the washer to maximum speed. We know that the final velocity is 9π ft/s and the acceleration is a. So we can solve for the time by rearranging the equation to get:
t = v(t) / a
Plugging in our values, we get:
t = 9π ft/s / a
Solving for t, we get:
t = 9π ft/s / 948 ft/s^2
Simplifying, we get:
t = 7.54 s
Therefore, it takes 7.54 seconds for the washer to reach its maximum speed. The magnitude of the acceleration of the outside wall the instant before it reaches maximum speed is 948 ft/s^2.
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Two conductors have the following initial charges: conductor A
has a negative charge QA = - 39.8 x 10-16 C and conductor B has a
positive charge qB = + 10.4 x 10-16 C. The two conductors are
brought in contact with one another (i.e., they touch) until they
reach electrostatic equilibrium (equal charges) and then
separated. Each conductor has now one-half of the sum of the
initial charges. How many excess electrons does conductor A has
after the equilibrium (after separation)? Please round your answer
to the nearest whole number (integer).
Equation: n=
Inet
e
where qnet is the absolute value of the net charge on conductor
A after separation and
e = 1.6 x 10-19 C.
The excess electrons that the conductor A has
after the equilibrium (after separation) is n = |qA + qB|/e = (39.8 + 10.4) x 10-16 C/1.6 x 10-19 C = 3000 electrons.
How do you calculate the excess electrons on a conductor after the electrostatic balance?The number of excess electrons on a conductor after the electrostatic balance can be calculated using the equation n=|Qnet|/e, where Qnet is the absolute value of the net charge on the conductor after the separation and e is the elemental charge (1.6 x 10-19 C). By using the formula and plugging in the values, we realize the value 3000 electrons
Therefore, conductor A has 3000 excess electrons after balance. It can then be concluded that the one the correct answer is as given.
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two objects are located on an airtrack. the magnitude of the charge on object a is 3 times higher than on object b, and object a also has a 6 times higher mass than object b. which one of the following is true for the magnitudes of the accelerations (not drawn to scale or necessarily in the correct direction)? |aa|
The correct statement is:
"The magnitude of the acceleration of object A is 6 times less than the magnitude of the acceleration of object B"
The magnitude of the acceleration for an object can be calculated using Coulomb's law, which states that the force between two charges is proportional to the product of the charges and inversely proportional to the square of the distance between them. The formula for the force between two charges is:
F = (k * q1 * q2) / r^2
where F is the force, k is the Coulomb constant, q1 and q2 are the charges, and r is the distance between the charges.
Since the acceleration is the force divided by the mass, we can use the formula:
a = F / m
where a is the acceleration, F is the force, and m is the mass.
Given that the charge on object A is 3 times higher than on object B, and object A has a 6 times higher mass than object B, we can determine that:
The force acting on object A is 3 times greater than the force acting on object B (due to the difference in charges)
The mass of object A is 6 times greater than the mass of object B
So, the acceleration of object A is 6 times less than the acceleration of object B.
Therefore, the correct statement is:
"The magnitude of the acceleration of object A is 6 times less than the magnitude of the acceleration of object B"
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classify each of the following substances as an element, compound, or mixture using the dropdown menus in the classification table.
Each sort of atom in an element is unique. The joining of two or more distinct atoms results in a compound. In a mixture, two or more distinct substances are combined but not chemically bonded.
Is CO2 a combination of elements or a compound?With two oxygen atoms and one carbon atom, carbon dioxide, or CO2, is a chemical molecule.Each sort of atom in an element is unique. The joining of two or more distinct atoms results in a compound. In a mixture, two or more distinct substances are combined but not chemically bonded.A crystal-like lattice of the two ions Na+ and Cl- makes up the ionic compound salt, which is composed of two ions. Many sodium chloride molecules can be found in salt water.Carbon, Hydrogen, and Oxygen, which are joined by covalent bonds, make up the organic molecule known as vitamin D. Any chemical species that consists of two or more components is called a compound.To learn more about compound refer to:
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A certain lightning bolt moves 22.7 C of charge. How many fundamental units of charge is this? Your answer will be in the form of: N x 1019 and you need to indicate the number N, do not include the unit.
Hint: e = 1.6 x 10-19 C.
The fundamental units of charge is 14.18 C for moving 22.7C of charge.
An object's ability to feel an attractive or repulsive force toward another is determined by its electric charge, also known as charge for short. The coulomb is the primary measure of charge (C). There are two forms of charge: protons exhibit positive charge, while electrons exhibit negative charge (exhibited by electrons). The electric forces between charged particles are described by Coulomb's law; if the charges shift, the electromagnetic force becomes more complex.
fundamental charge=[tex]\frac{q}{e}[/tex]
Now, n=[tex]\frac{22.7}{1.6\times10^{-19} }[/tex]
n=[tex]1.418\times10^{20}[/tex]
and according to question,
the value of fundamental unit charge is 14.18.
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How far does the object travel between 5 and 10 s
The distance travelled by the object between 5 and 10 seconds is 25 m.
What is the distance travelled by the object?The area under velocity time graph gives the distance travelled by the object.
The distance travelled by the object between 5 and 10 seconds is calculated from the area of curve within this time range.
Area of the curve between 5 and 10 seconds = Area of triangle
Distance travelled between 5 and 10 seconds = Area of triangle formed between 5 and 10 seconds
Area of triangle = ¹/₂bh
where;
b is the base of the triangleh is the height of the triangleA = ¹/₂ x (10 - 5 ) x ( 10 )
A = 25 m
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A fisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. It takes 3.0 s for
the boat to travel from its highest point to its lowest, a total distance of
0.69 m. The fisherman sees that the wave crests are spaced 8.0 m apart.
(a) How fast are the waves traveling
Longitudinal waves takes the boat 2.5 seconds to move from the highest point to the lowest point and the total distance is 0.62 m. A fisherman confirms that the summit he is 6.0 off.
What is longitudinal waves?In the deep waters far offshore, the slowest wave components with the shortest periods and the smallest wave-to-height intervals can travel at less than 5 miles per hour. The component with the longest period could be moving at 35 miles per hour or more. Longitudinal waves, like sound, travel through a medium at a velocity that depends on the density and elasticity of the material. The speed of sound is 0.33 km/sec (0.2 miles/sec) in air, 1.5 km/sec in water, and 5 km/sec in steel.Longitudinal waves, like sound, travel through a medium at a velocity that depends on the density and elasticity of the material. The speed of sound is 0.33 km/sec (0.2 miles/sec) in air, 1.5 km/sec in water, and 5 km/sec in steel.To learn more about longitudinal waves from the given link:
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3) for the following measurements, underline the digits that are known with certainty and highlight in color the digits that are estimated. if a number is ambiguous, that is, the number of significant figures is uncertain, state so. in each case, explain your reasoning.
Measurements with precise numbers underlined and estimated numbers highlighted are a) 4.35 m, b) 0.009340 g, c) 3400 km, and d) 1.38 x 103 m/s. An extrapolation using scientific notation is used to create the final figure in d).
A) 4.35 m - Since they can be measured directly or read from a meter, the numbers 4, 3, and 5 are well-known.
B) 0.009340 g - The numbers 0, 0, 9, 3, 4, and 0 are known for sure because they can be measured or read from a scale.
C) 3400 km - The numbers 3, 4, 0, and 0 can be read directly from a measuring device, so they are known for sure.
D) 1.38 x 103 m/s - Numbers 1, 3, and 8 can be measured or read directly from the instrument, so they are known for sure. Since the number "3" is written in scientific notation, it qualifies as an estimate and thus approximates the true value.
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The question is -
For the following measurements, underline the digits that are known with certainty and highlight in color the digits that are estimated. If a number is ambiguous, that is, the number of significant figures is uncertain, state so. In each case, explain your reasoning. 3) a) 4.35 m b) 0.009340 g c) 3400 km d) 1.38 x 103 m/s
find the largest natural number m such that n 3 - n is divisible by m for all n e n. prove your assertion.
Since the sum of the odd term coefficients and the even term coefficients must both be zero, the expression a0+a1k+a2k2++ankn is divisible by 3 for all kN.
What is the greatest integer that can divide each natural number n by n3?Number `n3n is divisible by 6 because there is a multiple of two in a pair of consecutive numbers and a multiple of three in a triplet of consecutive integers.Since the sum of the odd term coefficients and the even term coefficients must both be zero, the expression a0+a1k+a2k2++ankn is divisible by 3 for all kN.Equation n3−n=n(n2−1)=n(n+1)(n−1). There must be at least one even number among these three consecutive integers. Furthermore, 3 must divide one of the integers using the same reasoning. As n3n is divisible by 2 and 3, it follows that it is divisible by 6, too.To learn more about consecutive numbers refer to:
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a simply supported beam has a concentrated moment ma applied at the left support and a concentrated force f applied at the free end of the overhang on the right. using superposition, determine the deflection equations in the regions ab and bc.
To determine the deflection equations in the regions AB and BC of the simply supported beam using superposition, we first need to find the deflection equations for the beam under each load separately and then add them together.
Deflection due to the concentrated moment M_A at the left support:
The deflection equation for this case can be found using the equation:
δ(x) = (M_A * x²) / (6 * E * I)
Where δ(x) is the deflection at a distance x from the left support, M_A is the concentrated moment at the left support, E is the modulus of elasticity, and I is the moment of inertia.
Deflection due to the concentrated force F at the free end of the overhang on the right:
The deflection equation for this case can be found using the equation:
δ(x) = (F * (L - x)³) / (3 * E * I)
Where δ(x) is the deflection at a distance x from the right support, F is the concentrated force at the free end of the overhang, L is the length of the beam, E is the modulus of elasticity, and I is the moment of inertia.
SuperpositionBy the principle of superposition, the total deflection at any point is the sum of the deflections caused by each load.
Therefore,
δ(x) = (M_A * x²) / (6 * E * I) + (F * (L - x)³) / (3 * E * I)
Where x is the distance from the left support (AB) and
δ(x) is the total deflection in AB
And,
δ(x) = (F * (L-x)³) / (3 * E * I)
Where x is the distance from the right support (BC) and
δ(x) is the total deflection in BC
Note: The concentrated moment M_A has no effect on deflection in BC as it is on the left side of the support.
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You have the option of making a two-point turn, U-turn or going counter-clockwise around the block to reverse your direction. You will likely best minimize your risk by:
a. Making a U-turn
b. Going around the block
c. Making a two-point turn
d. The risk is likely to be the same for all three options given
You will likely best minimize your risk by making a two-point turn.
The greatest strategy to reduce your danger when changing lanes on a two-way street is to do a two-point turn by retreating into a driveway on your right before moving forward into the roadway.
Turnabouts are turning maneuvers in which a driver reverses the direction of a moving vehicle by making a series of motions. A turnabout accomplished by first backing into a driveway or an alley is known as a two-point turnabout. A turnabout can also be accomplished by backing into a roadway after entering an alley or driveway, albeit this method is riskier.
Turning your car around to travel in the opposite direction is known as a turnabout. When deciding to use a turnabout, take the appropriate precautions.
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question an object of mass 0.5 kg experiences a force that is associated with the potential energy function u(x)
a. The sketch graph of U(x) versus x is in the attachment.
b. The force function that associate with the potential energy function is F(x) = 8.0 (2.0 + x)⁻²
c. The speed of the particle at x = 2 is 2 m/s.
The full question is in the attachment. To create a graph, substitute some values of x into the equation of the function to determine the pair of point coordinates.
a. Graph of U(x) = 4.0/(2.0 + x) versus x making a curve because the function is a fraction function and the curve will not intersect the x-axis.
If x = 0From these coordinates a graph is created in the image.
b. A conservative force is a force that works on an object depends only on the initial and final position of the object and not on the path of the object. The total work from a conservative energy is always the same with the changes in potential energy
W = - ΔU
F × Δx = - ΔU
W = the total work (J)Δx = the distance (m)ΔU = the potential energy (J)The conservative force acting on the object is the derivate of the potential energy function for the objects
F = - dU/dx
U(x) = 4.0/(2.0 + x) = 4.0 (2.0 + x)⁻¹
F = - 4.0 × - 2 (2.0 + x)⁻² × 1
F(x) = 8.0 (2.0 + x)⁻²
c. The kinetic energy Ke = 0.5 mv²
m = the massv = the speedKe = kinetic energyWhen the object is released from rest at the origin to x = 2
The initial speed = v₁ = 0According to law of conservation of energy
Ke₁ + U(0) = Ke₂ + U(2)
0 + 2.0 = Ke₂ + 1.0
Ke₂ = 2.0 - 1.0
Ke₂ = 1.0 J
0.5 mv₂² = 1.0
0.5 × 0.5 × v₂² = 1.0
v₂² = 1.0 ÷ 0.25
v₂² = 4
[tex]v_2 \:=\: \sqrt{4}[/tex]
v₂ = 2 m/s
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an object of mass initially at rest on a surface has both kinetic and potential energies equal to zero. it is then lifted under the influence of both nonconservative forces and the conservative force of gravity. the nonconservative forces do of work on the object. the conservative force does of work. 25. the potential energy of the object after the motion is
Speed of the object after motion is finished will be 3.0 m/s if surface has kinetic and potential energy as zero.
The speed of the object at the end of the motion can be calculated using the work-energy principle, which states that the work done on an object is equal to the change in its kinetic energy.
First, we need to calculate the final kinetic energy of the object. The work done by non-conservative forces is positive, so it increases the kinetic energy of the object. The work done by the conservative force of gravity is negative, so it decreases the kinetic energy of the object.
Final kinetic energy = initial kinetic energy + work done by nonconservative forces + work done by conservative forces
Final kinetic energy = 0 + 40 J - 22 J
Final kinetic energy = 18 J
Next, we can use the formula for kinetic energy (1/2mv^2) to calculate the final velocity of the object.
Final kinetic energy = 1/2mv^2
18 J = 1/2 (4 kg) v^2
v^2 = 18 J / (1/2)(4 kg)
v^2 = 72 J/kg
v = √(72 J/kg)
v = √(72 J/kg)
v ≈ 3.0 m/s
Therefore, the speed of the object at the end of the motion is most nearly 3.0 m/s.
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Answer:
+ 22 J
Explanation:
This one is quite short.
We are told that -22 J of conservative work was done. Thus, the work by gravity was - 22J.
Since we know energy is conserved, that energy would now be positive as it is now stored.
Thus, we would have +22J stored as potential energy (gravity) after the motion.
Hope this helped :)
which of the following sketches and choice of coordinate axis best describe the physical situation presented in this problem?
A negative acceleration indicates that you will reduce the velocity's present value, while a positive acceleration indicates that you will increase it.
How can one tell whether an acceleration is positive or negative?According to mathematics, a negative acceleration indicates that you will reduce the velocity's present value, while a positive acceleration indicates that you will increase it.A horizontal line can be seen on the acceleration-time graph in its negative area (negative acceleration).The slope of a line is positive (+) if it slopes uphill from left to right. The slope of a line is negative if it slopes downward from left to right (-). A positive slope in our pizza example indicates that as we add more toppings (x), the overall price of the pizza (y) also rises.To learn more about acceleration refer to:
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What is the average speed of the car during the first hour of the trip? (2 point
O 1 miles/hour
5 miles/hour
40 miles/hour
O 25 miles/hour
Answer:40 miles/hour
You’re at the ice-skating rink with a 5kg bowling ball. The two of you (you and the bowling ball) stand motionless in the middle of the rink so that your combined momentum is zero. You then throw the bowling ball and begin to slide backward. If your momentum is then 12 kg • m/s backward, what is speed does the bowling ball have?
The speed of the bowling ball is 2.4 m/s forward.
What is the speed of the bowling ball?
The speed of the bowling ball is calculated by applying the principle of conservation of linear momentum as shown below.
P1 = -P2
where;
P1 is your momentumP2 is the momentum of the bowling ballP1 = -mv
-P1 = mv
where;
m is the mass of the bowling ballv is the speed of the bowling ballThe speed of the bowling ball is calculated as;
v = ( - 12 kgm/s ) / ( 5 kg )
v = -2.4 m/s
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if the current i is .6 a for an air gap length of 1 mm, calculate the magnetic field density in the air gap
Magnetic field density in the air gap = mmf/area of air gap = 0.6/1 mm2 = 0.6 Tesla
What is Magnetic field?A magnetic field is an invisible force field created by an electric current or a permanent magnet. It is a vector field that surrounds a magnetically charged object and exerts a force on other objects in its vicinity. The strength of a magnetic field is measured in amperes per meter (A/m).
The magnetic field density in the air gap is equal to the magnetomotive force (mmf) divided by the area of the air gap.
mmf = i x (1 mm) = 0.6
Area of air gap = 1 mm x 1 mm = 1 mm2
Magnetic field density in the air gap = mmf/area of air gap = 0.6/1 mm2 = 0.6 Tesla
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a 60 g tennis ball with an initial speed of 39 m/s hits a wall and rebounds with the same speed. (figure 1) shows the force of the wall on the ball during the collision.
Fmax is calculated from Fmax = (pulse change) / peak time.
The maximum contact force Fmax on impact can be calculated using the impulse-impulse theorem.
Momentum - The momentum theorem states that the momentum (change in momentum) of an object is equal to the force on the object multiplied by the time the force is applied. In this case, the momentum of the ball is equal to the wall force on the ball multiplied by the time of the collision.
Momentum is also equal to the ball's momentum change, which is the final momentum minus the initial momentum.
Since the ball has a known mass (60 g) and a constant velocity, the momentum of the ball is equal to the mass multiplied by the velocity (60 g) (37 m/s).
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The question is -
A 60 g tennis ball with an initial speed of 37 m/s hits a wall and rebounds with the same speed. Shows the force of the wall on the ball during the collision.
What is the value of Fmax, the maximum value of the contact force during the collision?