Answer:
0.3km/min
Explanation:
2.4/8=24/80=3/10=0.3
this type of force is applied to a moving object. it causes the object to slow down or stop because it acts in the opposite direction of motion.
(I'm genuinely so confused, the notes the teacher gave us in class sucks, and he never responds to his emails.)
Energy must be transferred for motion, which is displacement, between the item and its system or environment. The energy's direction might either be toward or away from the object.
In your case, the energy must originate from the item itself in order for the force and subsequent movement to be in the opposite direction. For instance, rocket propulsion and jet engines. Propellers operate on a totally different mechanism that may be stated simply as "big pull, tiny push," therefore you cannot think of them in this way. Because they combine gasoline sparking to provide more thrust in turbojet engines (hence turbo).
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sketch a velocity -time graph for a body thrown vertically upward to a maximum height
The velocity time graph for a body thrown vertically upward to a maximum height is given below:
What is velocity?
The pace at which an object's position changes as perceived from a particular point of view and as measured by a particular unit of time (for example, 60 km/h northbound) is defined as its velocity. Velocity is a fundamental concept in kinematics, the branch of classical mechanics that deals with the motion of bodies.
In order to be defined, the physical vector quantity known as velocity needs to have both a magnitude and a direction. Speed is a coherent derived unit whose quantity is measured in metres per second (m/s or m/s1) in the SI. Speed is the scalar absolute value (magnitude) of velocity (metric system). "5 metres per second," for example, is a scalar as opposed to "5 metres per second east," which is a vector.
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the speed of sound in air at room temperature is approximately 343 m/s. calculate this speed in miles per hour, given that 1 mi
The speed of sound in miles per hour is 767.33 miles/h when the speed of sound in air at room temperature is approximately 343 m/s.
What do you mean by speed of sound?The distance a sound wave travels through an elastic material in one unit of time is measured as its speed of sound. At 20 °C, the speed of sound in air is approximately 343 m/s, or 2.91 or 4.69 seconds for a mile.
The properties of the medium itself determine the speed of a sound wave because sound needs a medium to travel through (such as density, stiffness, and temperature). For every degree, the velocity of sound drops by roughly 6 meters per second. Compression waves, which at a small scale rely on molecules transmitting energy one to another, are used to convey sound through the air.
We are given that 1 mi = 1609 m.
Also we know that 1 hour = 3600 s
Therefore,
343m/s*3000s/h*(1/1609mi/h)=767.433mi/h
Thus, the speed of sound in miles per hour is 767.33 miles/h.
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At the position of the stop-light 4 s after the light had turned green. what is the slowest constant speed which the green car can maintain and still catch up to the blue car? answer in units o
The green car must travel at least 3 m/s in order to catch up to the blue car.
The blue automobile might go slower if the green car is moving faster than it is at the point where the distance between them equals 0. Furthermore, the green automobile will never catch up to the blue car if the blue car moves faster than the green car before they collide.
The blue car's speed as a function of time is given by v(T) = 0.3T. The equation for the position of the green automobile can be rewritten as g(T) = (T-5) *0.3T given the justification for the ideal speed. Set the equations to be equal to one another since we want the distance between the green and blue automobiles to be the same. (T-5) *0.3T = 0.15*T^2 Then, calculate T (T-5) *0.3T = 0.15*T2, where 0.3T2 - 1.5T equals 0.15T2 and 1.5T - 0.15T2 = 0. Our quadratic equation now has the values A = 0.15, B = -1.5, and C = 0.
To determine the roots, which are -4.5 and 10, use the quadratic formula. The interception will happen at T=10 because the number of 10 implies that it will, hence the velocity must be v(T) = 0.3T v (10) = 0.3*10 = 3 m/s. The green car must travel at least 3 m/s in order to catch up to the blue car.
The complete question is- A blue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.2 m/s². A green car arrives at the position of the stop-light 7.5 s after the light had turned green. What is the slowest constant speed which the green car can maintain and still catch up to the blue car? Answer in units of m/s.
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when a man returns to his well-sealed house on a summer day, he finds that the house is at 35°c. he turns on the air conditioner, which cools the entire house to 20°c in 30 min. if the cop of the air-conditioning system is 2.8, determine the power drawn by the air conditioner. assume the entire mass within the house is equivalent to 80
Answer:
The power drawn by the air conditioner assuming the entire mass within the house is equivalent to 800 kg cv= 0.72 kJ/kgK and c_{p}cp = 1.0 kJ/kgK is 1.71 kW
Explanation:
The entire amount of heat that needs to be removed from the house is given by the expression:
QL = mCvT
m = mass = 800kg
dT = 35-20oC
QL = 800 * (0.72 Kj/Kb.oC) * 15
QL= 8640Kj
To calculate the average rate of heat removal from the house, we use
QL = Ql/dt
QL = 8640Kj/30*60
QL = 4.8 Kw
The total power input to the AC is calculated by;
Win = QL/COP
Substituting in the given value
Win = 4.8 Kw/2.8
Win = 1.71 Kw
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calculate the de broglie wavelength of a subatomic particle that is moving at 351 km/s, if its mass is 9.11 x 10–31 kg. λ
De Broglie wavelength of the subatomic particle is 0. 0020 * (10 )^ -3 nm.
What do you mean by a subatomic particle?Any of the multiple self-contained units of matter or energy that are the building blocks of all matter are considered subatomic particles, also known as elementary particles. They include the heavier constituents of the small but extremely dense atom's nucleus, the positively charged protons and the electrically neutral neutrons, as well as the electrons, the negatively charged, nearly massless particles that nonetheless make up the majority of the atom's size. The only known subatomic particles, however, are not these fundamental atomic building blocks. The electron is just one member of a class of fundamental particles that also includes the muon and the neutrino. Protons and neutrons, for example, are composed of quarks.
Let the De Broglie wavelength be Λ.
Λ = h/p
= (6.626 * 10^-34) / (351 * 9.11 * 10^-31)
Λ = 0.0020 * 10^-3 nm
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With what speed (in feet/second) must a ball be thrown vertically upward in order to rise to a height of 37.8 ft, neglecting air resistance?
The ball in order to rise to a height of 37.8 ft was launched with a speed of: 49.3158 ft
The formula for the vertical launch upward and the procedure we will use is:
y max = v₀²/(2*g)
Where:
v₀ = initial velocityg = gravityy max = maximum heightInformation about the problem:
g = 32.17 ft/s²y max= 37.8 ftv₀ = ?Applying the maximum height formula and clearing the initial velocity we get:
y max = v₀²/(2*g)
v₀ = √(y max * (2*g))
v₀ = √( 37.8 ft * (2 * 32.17 ft/s²))
v₀ = √( 37.8 ft * 64.34 ft/s²)
v₀ = √2432.052 ft²/s²
v₀ = 49.3158 ft
What is vertical launch upwards?In physics vertical launch upwards is the motion described by an object that has been launched vertically upwards in which the height and the effect of the earth's gravitational force on the launched object are taken into account.
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Question 12 an earth satellite has a speed of 7.5 km/s and a flight path angle of 10 degrees when its radius is 8000 km. what is the angular momentum (in km 2/s)?
-21.7 km²/s is the angular momentum (in km 2/s) of the earth's satellite.
What is a satellite?
An object that has been sent into orbit in space on purpose is known as a satellite or artificial satellite.Most spacecraft, with the exception of passive satellites, contain a means of generating power for the technology they carry, such as solar panels or radioisotope thermoelectric generators (RTGs).The majority of satellites also feature transponders, which are a type of ground station communication system.The most common satellites, tiny CubeSats, employ a standardized bus to reduce costs and labor. Satellites are made to be as light and durable as feasible due to the high expense of space launch.To learn more about satellites and angular momentum, visit: https://brainly.com/question/19579165
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Identify the circuit for a light fixture controlled by four switches, where flipping one of the switches turns the light on when it is off and turns it off when it is on.
the circuit for a light fixture controlled by four switches, where flipping one of the switches turns the light on when it is off and turns it off when it is on is given as: ([tex]\overline {x}[/tex]yzw) + (x[tex]\overline {y}[/tex]zw) + (xy[tex]\overline {z}[/tex]w) + (xyz[tex]\overline {w}[/tex])
Here, overlined x , y , z and w represents the switch of the circuit(see the image)
So if one of the four switches is flipped the light turn on when it is off and turns it off when it is on.
What is a circuit?A circuit in electronics is a fully enclosed circle through which electricity travels. A load, conductors, and a current source make up a basic circuit. Any fixed path that electricity, data, or a signal can go through can be referred to as a circuit in a broad sense.
Electrons in an electronic circuit leave the power source, move along conductors, pass through a load to do work, and then return to the power source. The circular course that the electrons take through it gives it the name "circuit." Ohm's Law provides a description of the connection between electrical flow and load. In a circuit, electrons move from the negative to the positive side of the power supply.
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Two vectors of the same magnitude are added; one pointing east, one west. the magnitude of the resultant vector is :_________
Answer:
The magnitude of the resultant vector, two vectors of the same magnitude are added; one pointing east, one west is Zero.
Explanation:
Vector resolution is the process of identifying the magnitude and direction of a vector's components visually or trigonometrically. The magnitudes of the aforementioned vector are due to the fact that the vector sum of all forces must still be zero.
A resultant force can be found by adding two forces together. A single force can be resolved (divided) into two component forces that are at right angles to one another.
A vector quantity with magnitude and direction can be used to represent a force. The pulling force may be resolved using vector diagrams into a horizontal component acting to the right and a vertical component acting upwards (or forces acting in opposite directions).
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a rigid tank is divided into two equal parts by a partition. one part of the tank contains 2.5 kg of compressed l
Complete question
A rigid tank is divided into two equal parts by a partition. One part of the tank contains 2.5 kg of compressed liquid water at 400 kPa and 60
60 ∘ C while the other part is evacuated. The partition is now removed, and the water expands to fill the entire tank. Determine the entropy change of water during this process, if the final pressure in the tank is 40 kPa.
Water expands to fill the entire tank. For a final pressure of 10 kPa, the final water temperature is 60°c and the tank volume is 2245.4.
The energy balance:
[tex]E_{in} -E_{out} =[/tex] Δ[tex]E_{system}[/tex]
So, therefore
0 = ΔU [tex]mm(u_{2} -u_{1} )[/tex]
[tex]u_{1} =u_{2}[/tex]
Water's characteristics are listed in tables A = 4 and A-6.
[tex]p_{1} = 600 kpa[/tex]
[tex]T_{1}[/tex] = 60°c
⇒ [tex]v_{1} = v_{f}[/tex]
⇒ 60°c = 0.001017
⇒ [tex]u_{1} =u_{f}[/tex]
⇒ 60°c = 251.16
Confirmed whether we receive quality between 0 and 1.
[tex]P_{2}[/tex] = 10kpa
[tex](u_{2}-u_{1} )[/tex]
We have [tex]v_{f}[/tex] = 0.001010,
v = 14.670
[tex]u_{f}[/tex] = 191.79,
[tex]v_{f}[/tex] = 2245.4
So, therefore, water expands to fill the whole tank. For a final pressure of 10 kPa, the very last water temperature is 60°c and the tank quantity is 2245.4.
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____ is a process by which organisms with characteristics suited to the environment will survive and reproduce.
Answer:
Natural selection is a process by which organisms with characteristics suited to the environment will survive and reproduce
HOPE IT'S HELPS YOUshot from a cannon in 1998, david "cannonball" smith set the distance record for being shot from a cannon (56.64 m). during a launch in the cannon’s barrel, his speed increased from zero to 80 km/h in 0.40 s. while he was being stopped by the catching net, his speed decreased from 80 km/h to zero with an average acceleration of 180 m/s2m/s2. what can you determine about smith’s flight using this information? homework
The final velocity of the cannon camera is 22m/s
This question informs us that David will depart on a voyage at his maximum speed. Consequently, the speed is 80 km/h. So we have to convert. At a 2 m/s rate, listen. We must multiply our number of 80 by the quantity of meters in a club in order to convert it to units. His final velocity therefore equals 22.2
a= v/ t = 56m/sec square dec acceleration = 80km/h converting into final velocity m /s sec its 22.2m/s
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What happens to the time to complete a movement if angular velocity is increased?
The time to complete a movement if angular velocity is increased is Angular speed
Angular speed is the price of speed at which an object or a particle is rotating round a middle or a specific factor in a given time period. it's also referred to as rotational pace. Angular pace is measured in attitude in keeping with unit time or radians per second (rad/s). The fee of alternate of angular speed is angular acceleration. let us analyze in extra element approximately the relation among angular speed and linear pace, angular displacement and angular acceleration.Angular pace plays an eminent position within the rotational movement of an item. We already understand that in an item showing rotational movement all the particles circulate in a circle. The linear pace of each collaborating particle is without delay associated with the angular velocity of the entire item.those become as vector products relative to each other. basically, the angular velocity is a vector amount and is the rotational speed of an object. The angular displacement of in a given period of time gives the angular velocity of that item.
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In the metaphor of the bottle for theory of constraints, which part of the bottle represents the constraint?
In the metaphor of the bottle for theory of constraints, the part of the bottle represents the constraint is neck.
What is metaphor?A metaphor is a figure of the speech that describes an object or action in a way that isn’t literally true, but helps explain an idea or make a comparison.
Here are the basics:
A metaphor states that one thing is the another thing. It equates those two things not because they actually are the same, but for the sake of comparison or symbolism and if you take a metaphor literally, it will probably sound very strange (are there actually any sheep, black or otherwise, in your family?). Metaphors are used in the poetry, literature, and anytime someone wants to add some color to their language
The uses of metaphor, and the official definition:
A word or phrase for one thing that is used to refer to the another thing in order to show or suggest that they are similar
An object, activity, or idea that is used as a symbol of the something else
Metaphors are a form of the figurative language, which refers to words or expressions that mean something different from their literal definition. In the case of metaphors, literal interpretation would often be pretty silly.
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In the metaphor of the bottle for theory of constraints, the part of the bottle represents the constraint is neck.
What is metaphor?A metaphor is a figure of the speech that describes an object or action in a way that isn’t literally true, but helps explain an idea or make a comparison.
Here are the basics:
A metaphor states that one thing is the another thing. It equates those two things not because they actually are the same, but for the sake of comparison or symbolism and if you take a metaphor literally, it will probably sound very strange (are there actually any sheep, black or otherwise, in your family?). Metaphors are used in the poetry, literature, and anytime someone wants to add some color to their language
The uses of metaphor, and the official definition:
A word or phrase for one thing that is used to refer to the another thing in order to show or suggest that they are similar.
An object, activity, or idea that is used as a symbol of the something else
Metaphors are a form of the figurative language, which refers to words or expressions that mean something different from their literal definition. In the case of metaphors, literal interpretation would often be pretty silly.
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a speeding bullet the fastest commercially available rifle bullet claims a muzzle velocity of 4225 ft/s .
Complete Question
The fastest commercially available rifle bullet claims a muzzle velocity of 4225 ft>s.
(a) what is this speed in miles per hour
The fastest rifle bullet reportedly has a muzzle velocity of 4225 feet per second. This speed is equivalent to 2880.68274 miles per hour in miles per hour.
Given Data:
1 foot = 0.000189394 miles4225 feet = 0.000189394 × 4225 milesNow allow us to locate the space covered by way of the bullet in one secondDistance included via a bullet in 1 second = 0.000189394 × 4225 milesDistance traveled by means of a bullet in 1/3600 hour = zero.000189394 × 4225 milesNow let us find the gap included by way of the bullet in a single hourDistance protected with the aid of a bullet in 1 hour = 0.000189394 × 4225 × 3600 milesthe velocity of the bullet is 2880.68274 miles/hour.Know more about bullet velocity:
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calculate charlie's displacement on his bicycle if he travels a constant velocity of 8km/h north for 30 minutes
a, 240 km north
b, 4 km north
c, 22 km north
d, 16 km north
e, 38 km north
pls help
Answer:
B 4km north
Explanation:
A boy heard the thunder 18.74998 seconds after the lightening of a storm which is at a distance 6km , so the speed of sound in air equals .....( Where the speed of light in air = 3000000)
I already checked the answer in the answer book it's velocity= 320 m/s but I don't understand how
If anyone can help me please do
If a boy heard the thunder 18.74998 seconds after the lightening of a storm which is at a distance 6km , so the speed of sound in air is 320m/s.
As we know that,
Speed = Distance / Time
Firstly we calculate the time taken by light to travel distance 6 Km.
Given,
Distance = 6Km
Speed = 3000000m/s
Time = D/ S
= 6000/ 3000000
= 0.002s
So, the time taken by light to reach the ground is 0.002s.
Now,
Time taken by sound to reach the ground = time taken by light + 18.749.
0.002 + 18.749
= 18.75
Now, t = 18.75
d = 6km
Speed = 6000/18.75
= 320m/s
Thus, we concluded that if boy heard the thunder 18.74998 seconds after the lightening of a storm which is at a distance 6km , so the speed of sound in air is 320m/s.
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Enter your answer in the provided box.an empty vial weighs 63.28 g. if the vial weighs 436.33 g when filled with liquid mercury (d = 13.53 g/cm3), what volume of mercury is in the vial?
when filled with liquid mercury (density = 13.53 g/cm3) volume of mercury is in the vial is 88.41 cm3
Once you are aware of the mass of the mercury, you may calculate the volume of the vial by using the density of the mercury to determine its mass. You are aware that the vial including the mercury weighs 439.31 grams.
The vial weighs vial = 50.90 g.
This indicates that the mercury's mass will be 439.31 g - 50.90 g = 388.41 g.
You now understand that the density of mercury is 13.53 g/cm.
Density is the substance's mass per unit of volume. The symbol most often used for density is ρ although the Latin letter D can also be used.
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a horizontal directed force of 252 n is needed to keep a 555-n box sliding on a level wooden floor at a constant speed. what is the coefficient of sliding friction μ?
The coefficient of sliding friction μ is 0.45
Frictional force
The frictional force is a force that prevents an object from sliding. The formula for calculating the frictional force is expressed asl
Ff = μR
where
μ is the required coefficient of friction
R is the normal reaction
Given the following parameters
Ff = 252N
R = 555N
substitute
μ = Ff//R
μ = 252/555
μ = 0.45
Hence the coefficient of sliding friction μ is 0.45
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A lithium atom combines with a helium atom to make a new larger atom this is an example of
Answer
Fission.
Explanation:
Fission occurs when a neutron slams into a larger atom, forcing it to excite and split into two smaller atoms, also known as fission products.
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which of the following are the 2 postulates of relativity? (the other choices are consequences of relativity) a. the laws of nature are the same for all observers in uniform motion. b. the length of a moving object is not the same as when it is at rest. c. the speed of light is constant for all observers in uniform motion. d. two events that happen at the same time in one frame, can happen at different times in another frame. e. e
The correct answer is Option A and C.
The idea that the rules of physics are the same and can be expressed in their most basic form in all inertial frames of reference is the first postulate of special relativity. The assumption that the speed of light, or c, is a constant regardless of the source's relative motion is known as the second postulate of special relativity.
What are Albert Einstein postulates?
In all inertial reference frames, the rules of physics take the same form. Independent of the observer's speed, light moves across empty space at a specific speed (or source). The gravity formalism should be consistent with Newtonian gravity at low speeds.To learn more about postulates of relativity refer the link:
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What two factors determine the speed of a transverse wave? Explain how these two factors affect the speed of the wave.
Linear mass density and tension are the two factors on which the speed of the transverse waves on a string depends.
The square root of the linear mass density determines the speed of a wave on a string, with larger speeds occurring when the linear mass density is lower.
The linear density divided by the square root of the tension determines the wave's speed on a taut string.
The qualities of the medium affect a wave's speed. For instance, the sound of a guitar is created by the vibration of the strings. The wavelength and wave speed on the strings influence the frequency of the sound that is produced. A guitar's strings can be composed of materials that are similar in composition but varied in thickness.
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Angela runs 30 minutes every day, but her 5k race time is staying the same, and she is not having fun anymore. What should she do to improve?
She should add diversity to her exercise program to keep her from getting bored or lazy.
Because if you are not having fun with it anymore then you stop doing it.Your weekly exercise running mileage should drop the week before the event. Your training now mostly focuses on "saving up" rest so that your legs are prepared for the marathon.
To keep your legs fresh throughout the week, fit in two to three quick runs with a few quick pick-ups—short, snappy portions that get your legs working faster and get you ready for the faster tempo of the race. Take a day off to completely rest two days before the marathon. Do a quick exercise(20-minute) run with up to five 45-second pick-ups the day before the race to tone your legs.
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Please help! I’ve been doing this for 2 hours I want to be done!
Answer:
Both are chemical changesBoth conserve massExplanation:
please answer cause im not sure thx
Answer: B
Explanation:
R=A+B
A goes south
B goes east
R=
A+B=
South+East=Southeast ==> B
Answer:
B
Explanation:
Vectors are drawn as lines with arrowheads on them.
Vectors can be added together by drawing the arrows nose to tail.
To add vectors A and B, place the tail of vector B at the nose of vector A (see attached diagram).
The single vector that goes from the start to the end of the combined vectors is called the resultant vector.
As R = A + B, then R is the resultant vector of A and B.
R starts at the tail of vector A and goes to the nose of vector B.
a person travels by car from one city to another. she drives for 27.6 min at 62.7 km/h, 9.6 min at 115 km/h, 46.1 min at 45.2 km/h, and spends 12.3 min along the way eating lunch and buying gas.
The total distance between the cities is 60.1 Km.
We have a person driving between cities.
We have to calculate the distance between the cities.
What is the formula to calculate Distance travelled ?The formula to calculate the distance travelled is -
D = speed x time = v x t
According to the question -
When she drives at 62.7 km/h, her distance travelled will be -
d(1) = 62.7 x (27.6 / 60) = 28.8 Km
When she drives at 115 km/h, her distance travelled will be -
d(2) = 115 x (9.6 / 60) = 18.4 Km
When she drives at 45.2 km/h, her distance travelled will be -
d(3) = 62.7 x (12.3 / 60) = 12.9 Km
The total distance between the cities -
D = d(1) + d(2) + d(3) = 28.8 + 18.4 + 12.9 = 60.1 Km
Hence, the total distance between the cities is 60.1 Km.
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[ The given question is incomplete. You can access complete question down below -
" a person travels by car from one city to another. she drives for 27.6 min at 62.7 km/h, 9.6 min at 115 km/h, 46.1 min at 45.2 km/h, and spends 12.3 min along the way eating lunch and buying gas. Determine the distance between the cities along this route. ]
the g string on a guitar is a 0.42-mmmm-diameter steel string with a linear density of 1.1 g/mg/m . when the string is properly tuned to 196 hzhz, the wave speed on the string is 250 m/sm/s. tuning is done by turning the tuning screw, which slowly tightens-and stretches-the string.
So, by 1.86 mm, the G string on guitar string stretches, when it is first turned which then slowly tightens and stretches the string while the string is properly tuned to 196 hz, then the wave speed on this string is 250 m/s.
What is wave speed?The amount of space that a wave covers in a certain amount of time, such as the number of meters it covers in a second, is known as its wave speed.
Speed = Wavelength x Frequency is the exact equation that describes how this wave speed can be related to wavelength and wave frequency. When the wavelength and frequency are known, this equation can be used to determine the wave speed.
What is the wave speed equation?Wave speed is calculated using the equation wavelength/ time period. Since the S.I. unit for time is the second and the unit for wavelength is the meter (s). M/s is the S.I. unit for wave speed.
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you walk 6 meters to the east. then turn around and walk 4 meters west. find the distance travelled and find the displacement
Answer:
ffghccvvghcgjvccvb
Explanation:
gmvfjbcgijcfub cjjcv
jhggjvchivvvhj
A basketball player jumps vertically off the ground 5.6m/s how long were they in the air?
A basketball player jumps vertically off the ground 5.6m/s how long were they in the air
His total time in the air is 0.58s.Given that
A basketball player jumps vertically off the ground 5.6m/sTo find
Total time in the air.So, according the question
We have,
preliminary velocity u = five.6 m/s
and acceleration due to gravity g = - 9.81 m/s² ( - signal for upward movement )
( ∴ basketball participant jumps vertically and he travelled inside the air on the action of gravity so we recall his acceleration as g. )
Now, from first equation of motion.
v = u + at
velocity at highest point will be zero so
v = 0 , u = 5.6 m/s and a = g = - 9.81 m/s²
Now, putting the all values on first equation of motion.
0 = 5.6 - 9.81 × t
-5.6 = -9.81 × t
[tex]t = \frac{5.6}{9.81}[/tex]
t = 0.58 s.
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