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Mariana [72]
3 years ago
8

Which of the following statements most accurately differentiates potential and kinetic energy?

Physics
2 answers:
oksian1 [2.3K]3 years ago
8 0
A. Definitely this, because when I read this I exactly knew what it was, which I already did but..
lianna [129]3 years ago
8 0

Answer:

A. Any object that has motion has kinetic energy, while any object not in motion but with the potential to do work has potential energy.

Explanation:

Kinetic energy is associated to the motion energy in which object moves with certain speed.

It is given by the formula

E_k = \frac{1}{2}mv^2

Now similarly we can define potential energy as the energy stored in an object which is due to its position and the object must be at rest.

It may be of gravitational potential energy or spring potential energy or any other type

Gravitational potential energy is given as

E_p = mgh

both kinetic energy and potential energy is part of mechanical energy

so correct answer would be

A. Any object that has motion has kinetic energy, while any object not in motion but with the potential to do work has potential energy.

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What is the momentum of a 200 kg car traveling 30 m/s to the right?
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4 years ago
If you ride quickly down a hill on a bicycle your eardrums are pushed in before they pop back. Why is this?
Mice21 [21]

Answer:

<em>The difference in pressure between the external air pressure, and the internal air pressure of the middle ear.</em>

Explanation:

First of all, we should note that pressure decreases with height and increases with depth. The air within the middle ear (between the ear drum and the Eustachian tube) adjusts itself to respond to the atmospheric pressure, or when we yawn.  At a high altitude like on the hill, the air pressure in the middle ear, is fairly low (this is to balance the low air pressure at this height). While riding down the hill quickly, there is little time for the air pressure in the ear to readjust itself to the increasing external air pressure, causing the external air to push into the ear drum. Along the way, the air within the middle ear is adjusted by the opening of the Eustachian tube, allowing more air into the space in the middle ear to balance the external air pressure. This readjustment causes the ear to pop.

7 0
3 years ago
A 11kg block slides up a 30° inclined plane at a constant velocity. The coefficient of friction between the block and the plane
astra-53 [7]

Answer:

The magnitude of the applied force is 94.74 N

Explanation:

Mass of the block, m = 11 kg

Angle of inclination of the plane, \theta = 30^{\circ}

Friction coefficient, \mu_{k} = 0.2

Now,

Normal force that acts on the block is given by:

F_{N} = mgcos\theta + Fsin\theta           (1)

Now, to maintain the equilibrium parallel to ramp the forces must be balanced.

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Fcos\theta = \mu_{k}F_{N}                       (2)

From eqn (1) and (2)

Fcos\theta = \mu_{k}(mgcos\theta + Fsin\theta)

F(cos\theta - \mu_{k}sin\theta) = \mu_{k}mgcos\theta

F = \frac{\mu_{k}mgcos\theta}{cos\theta - \mu_{k}sin\theta}

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F = 94.74 N

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