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3 years ago

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What's the kinetic energy of an object that has a mass of 30 kilograms and moves with a velocity of 20 m/s? O A60000 OB 12000 O

C.5.680J O D. 2.9400

1 answer:

Anna007 [38]3 years ago

3 0

Answer:

D is the answer

Explanation: Because I did this

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A child has a toy car on a horizontal platform. The car starts from rest and reaches a maximum speed in 4 s. If the mass of the

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A spaceship is moving at 0.74 c (0.74 times the speed of light) with respect to the earth. An observer on the spaceship measures

olya-2409 [2.1K]

Answer:

The time interval is 22.76 hr.

Explanation:

Given that,

Time = 30 hrs

Speed = 0.74c

We need to calculate the time interval measured in earth frame

Using formula of time dilation

$\Delta t=\dfrac{\Delta t_{0}}{\sqrt{1-\dfrac{v^2}{c^2}}}$

Where, $\Delta t$ = time interval measured in earth frame

$\Delta t_{0}$ =proper time interval

Put the value into the formula

$\Delta t=\dfrac{30}{\sqrt{1-\dfrac{0.74c^2}{c^2}}}$

$\Delta t=\dfrac{30}{\sqrt{1-(0.74)^2}}$

$\Delta t=\dfrac{30}{0.6726}$

$\Delta t=44.60\ hr$

We need to calculate the proper time interval when the velocity is 0.86c

Using formula of time dilation

$44.60=\dfrac{\Delta t_{0}}{\sqrt{1-\dfrac{0.86c^2}{c^2}}}$

$\Delta t_{0}=44.60\times\sqrt{1-(0.86)^2}$

$\Delta t_{0}=22.76\ hr$

Hence, The time interval is 22.76 hr.

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3 years ago

What is the frequency of this wave<br> 1<br> 2<br> 3<br> 4

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The frequency of this wave is 3

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Sound energy is considered a form of kinatic energy because it's carried as vibrating waves. o T. True o F False

lana [24]

Answer:

True

Explanation:

Sound kinetic energy produces moving energy by using longitudinal waves. Sound is caused by the vibrations on or from an object, which is how it is considered a kinetic energy form.

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