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stellarik [79]
3 years ago
13

Your family is moving to a new house. While lifting the box 1.5 m straight up you exerted a force of 200 N for 1 second. How muc

h work is required?
Physics
1 answer:
AlladinOne [14]3 years ago
6 0

If you lifted 200 Newtons 1.5 meters straight up, you did 300 joules of work no matter how fast or slow you did it.

If you did it in 1 second, then you did it at the rate of 300 watts.

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A car initially at rest accelerates at 10m/s^2. The car’s speed after it has traveled 25 meters is most nearly... A.) 0.0m/s B.)
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The car traverses a distance x after time t according to

x=\dfrac12at^2

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25\,\mathrm m=\left(5\dfrac{\rm m}{\mathrm s^2}\right)t^2\implies t=\sqrt 5\,\mathrm s

5 is pretty close to 4, so we can approximate the square root of 5 by 2. Then the car's velocity v after 2 s of travel is given by

v=\left(10\dfrac{\rm m}{\mathrm s^2}\right)(2\,\mathrm s)\approx20\dfrac{\rm m}{\rm s}

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Since protons and neutron are massive bodies occupying a small space, they make the nucleus very dense.

learn more:

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