All categories

3 years ago

A car skids to a stop. What happens to its kinetic energy?

Physics

1 answer:

Orlov [11]3 years ago

4 0

Answer:

a) it turns into thermal energy

Explanation:

Due to the law of energy conservation, an object cannot just "lose" its kinetic energy, it must become another type of energy.

This eliminates option b. because energy of any type cannot disappear.

About option c, we have that the kinetic energy becomes potential energy, but the potential energy of an object is due to its height above the ground, so we cannot have potential energy if the tires are on the floor, we discard option c.

Also, kinetic energy is the energy an object has due to its motion, this means that if the object is not moving, it cannot have kinetic energy.

This eliminates option d.

The correct option is a) it turns into thermal energy.

The option meets the characteristic that the kinetic energy does not disappear, it is transformed into another type of energy. In this case it is thermal energy or heat, generated by friction between the tires and the floor.

You might be interested in

A driver slammed on her brakes and came to a stop with constant acceleration. Measurements on her tires and skid marks on the pa

IRISSAK [1]

Answer:

u = 29.22 m/s

Explanation:

distance (s) = 58.52 m

coefficient of kinetic friction (k) = 0.75

final velocity (v) = 0 m/s

acceleration due to gravity (g) = 9.8 m/s^{2}

How fast was she driving (u)

we can get how fast she was driving by using the formula below

s = ut - $\frac{1}{2}.at^{2}$ ...equation 1

where

s = distance
u = her initial velocity
a = acceleration = $\frac{f}{m} = \frac{kmg}{m} = kg$

k = coefficient of kinetic friction
g = acceleration due to gravity

t = time

from v = u - at (recall that v = 0)

0 = u - at, therefore t = u/a = u/kg

now substituting the required values above into equation 1 we have

s = $\frac{u^{2}}{kg} - \frac{u^{2}}{2kg}$

s = $\frac{u^{2}}{2kg}$

u = $\sqrt{2kgs}$

u = $\sqrt{2 x 0.75 x 9.8 x 58.52}$

u = 29.22 m/s

8 0

3 years ago

I REALLY NEED HELP PLEASE!!! CAN SOMEONE ANSWER THIS? At 0 ºC, some amount of energy is required to change 1 kg of water from a

Nezavi [6.7K]

Answer:

C)It would require more energy to change solid water into liquid water because there are more molecules in this larger piece of ice.

8 0

3 years ago

Read 2 more answers

Can someone help me a bit on this? Will mark brainliest. ( no physical science option soooo)

Advocard [28]

Answer:

When a light wave goes through a slit, it is diffracted, which means the slit opening acts as a new source of waves. How much a light wave diffracts<em> (how much it fans out)</em> depends on the wavelength of the incident light. The wavelength must be larger than the width of the slit for the maximum diffraction. Thus, for a given slit, red light, because it has a longer wavelength, diffracts more than the blue light.

The corresponding relation for diffraction is

$d sin(\theta) \approx \lambda$ ,

where $\lambda$ is the wavelength of light, $d$ is the slit width, and $\theta$ is the diffraction angle.

From this relation we clearly see that the diffraction angle $\theta$ is directly proportional to the wavelength $\lambda$ of light—longer the wavelength larger the diffraction angle.

7 0

3 years ago

A rock at the top of a 20 meter tall hill.The rock has a mass of 10 kg. How much potentail energy does it have?

ch4aika [34]

P.E.=mgh
= 10x10x20
=2000J

6 0

3 years ago

Which would most likely cause molten rock material to become glassy igneous rock?

Ainat [17]

The cooling on earth's surface (extrusive) makes a molten rock to become glassy. The lava cools so fast that crystals don't have time to form, which makes it glassy. Hope this helps!

6 0

3 years ago