Which statement best compares potential and kinetic energy?. . A) Objects always have more potential energy than kinetic energy..
B)Only kinetic energy increases when the velocity of an object increases. .
C)Only potential energy decreases when an object’s height increases..
D)Objects always have more kinetic energy than potential energ

Answers

Answer 1

Answer: Which statement best compares potential and kinetic energy?

Answer: Out of all the options shown above the one that represents the statement that best compares potential and kinetic energy is answer choice B) Only kinetic energy increases when the velocity of an object increases. The reason being that kinetic energy is the energy of any object in motion while potential energy is the stored energy.

I hope it helps, Regards.

Answer 2

Answer:

Taking into account the definition of kinetic and potencial energy, only kinetic energy increases when the velocity of an object increases.

Kinetic energy

Kinetic energy is a form of energy. It is defined as the energy associated with bodies that are in motion and this energy depends on the mass and speed of the body.

Kinetic energy is defined as the amount of work necessary to accelerate a body of a given mass and at rest, until it reaches a given speed. Once this point is reached, the amount of accumulated kinetic energy will remain the same unless there is a change in speed or the body returns to its state of rest by applying a force.

Kinetic energy is represented by the following formula:

Ec= ½ mv²

where:

Ec is the kinetic energy, which is measured in Joules (J).
m is the mass measured in kilograms (kg).
v is the speed measured in meters over seconds (m/s).

Potential energy

On the other hand, potential energy is the energy that measures the ability of a system to perform work based on its position. In other words, this is the energy that a body has at a certain height above the ground.

Gravitational potential energy is the energy associated with the gravitational force. This will depend on the relative height of an object to some reference point, the mass, and the force of gravity.

So for an object with mass m, at height h, the expression applied to the gravitational energy of the object is:

Ep= m×g×h

where:

Ep is the potential energy in joules (J).
m is the mass in kilograms (kg).
h is the height in meters (m).
g is the acceleration of fall in m/s² (approximately 9.81 m/s²).

Statement that best compares potential and kinetic energy

In this case, considering all of the above, the correct answer is option B) Only kinetic energy increases when the velocity of an object increases.

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A speeder passes a parked police car at a constant speed of 23.3 m/s. At that instant, the police car starts from rest with a uniform acceleration of 2.75 m/s 2 . How much time passes before the speeder is overtaken by the police car? Answer in units of s.

Answers

Answer:

32s

Explanation:

We must establish that by the time the police car catches up to the speeder, both have travelled a certain distance during the same amount of time. However, the police car experiences accelerated motion whereas the speeder travels at a constant velocity. Therefore we will establish two formulas for distance starting with the speeder's distance:

$x=vt=23.3(m)/(s)t$

and the police car distance:

$x=vt+(at^(2))/(2)=0+(2.75(m)/(s^(2)) t^(2))/(2)=0.73(m)/(s^(2))$

Since they both travel the same distance x, we can equal both formulas and solve for t:

$0 = 0.73(m)/(s^(2))t^(2)-23.3(m)/(s) t\n\n0=t(0.73(m)/(s^(2))t-23.3(m)/(s) )\n\n$

Two solutions exist to the equation; the first one being $t=0$

The second solution will be:

$0.73(m)/(s^(2))t=23.3(m)/(s)\n\nt=(23.3(m)/(s))/(0.73(m)/(s^(2)))=32s$

This result allows us to confirm that the police car will take 32s to catch up to the speeder

A(n) _____ wave best describes a wave whose direction of travel is perpendicular to the displacement of the medium.

Answers

A(n) Transverse wave best describes a wave whose direction of travel is perpendicular to the displacement of the medium.

Answer:

Explanation:

defenettly right

Please help me! In a collision, Kara Less who was traveling at 11 m/s while texting in her 1300 kg car, is struck by another vehicle and finds herself and her phone suddenly moving 2.5 m/s in the opposite direction. What impulse does she experience? SHOW WORKAnswer Choices

A. -12,000
B. -14,000
C. -16,000
D. -18,000

Answers

Answer:

D. -18,000

Explanation:

Let's define impulse :

Impulse is defined as the product of Force ( N ) applied on the body and the time of impact ( s ) or
The change in momentum

hence in this question ,

kara is initially moving with the :

velocity $v_(i)$ = 11 $ms^(-1)$

finally moving with velocity $v_(f)$ = -2.5 $ms^(-1)$ (minus as she moves in the opposite direction )

therefore the initial momentum $p_(i)$ = $m*v_(i) = 1300*11 = 14300 kgms^(-1)$

and the final momentum $p_(f)$ = $m*v_(f) = 1300*-2.5= 3250 kgms^(-1)$

thus the change in momentum : $p_(f)$ - $p_(i)$

= -3250-14300 = -17550 $kgms^(-1)$ ≅ -18000 $kgms^(-1)$

Alice and Tom dive from an overhang into the lake below. Tom simply drops straight down from the edge, but Alice takes a running start and jumps with an initial horizontal velocity of 25 m/s. Neither person experiences any significant air resistance. Just as they reach the lake below.A) Alice reaches the surface the lake first. B) Tom of reaches the surface of the first. C) Alice and Tom will reach the surface of the lake at the same time. D) Information is not enough

Answers

Answer:c

Explanation:

Given

Alice launches with horizontal velocity $u=25\ m/s$

Tom simply drops straight down from the edge

Time taken by both the person is same as they have same initial vertical velocity i.e. zero so the time taken to reach the ground is zero.

Although Alice will travel more horizontal distance compared to Tom.

Thus option c is correct

Sound waves in air are a series ofa. periodic disturbances.
b. periodic condensations and rarefactions.
c. high- and low-pressure regions.
d. all of the above E. none of the above

Answers

Sound waves in air are a series of periodic disturbances, periodic condensations and rarefactions, and high- and low-pressure regions. It is all of the above. The answer is letter D.

Final answer:

Sound waves in air are a series of periodic condensations and rarefactions.

Explanation:

Sound waves in air are a series of periodic condensations and rarefactions. When a sound is produced, it creates compression regions (areas of high pressure) and rarefaction regions (areas of low pressure) that propagate through the air. These alternating regions of high and low pressure create the characteristic waveform of the sound wave.

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