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Genrish500 [490]
3 years ago
5

Why is lifing a box a form of work

Physics
2 answers:
vodomira [7]3 years ago
3 0
Because you are moving down to up
almond37 [142]3 years ago
3 0
Because you moved form down to up
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A boxer punches a sheet of paper in midair and brings it from rest up to a speed of 30 m/s in 0.060 s .
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Answer:

Force exerted, F = 1.5 N

Explanation:

It is given that, a boxer punches a sheet of paper in midair and brings it from rest up to a speed of 30 m/s in 0.060 s.

i.e. u = 0

v = 30 m/s

Time taken, t = 0.06 s

Mass of the paper, m = 0.003 kg

We need to find the force the boxer exert on it. The force can be calculated using second law of motion as :

F=m\times a

F=m\times (\dfrac{v-u}{t})

F=0.003\times (\dfrac{30}{0.06})

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The 68-kg crate is stationary when the force P is applied. Determine the resulting acceleration of the crate if (a) P = 0, (b) P
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Explanation:

Mass of the crate, m = 68 kg

We need to find the resulting acceleration if :

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a=\dfrac{181\ N}{68\ kg}

a=2.67\ m/s^2

(c) P = 352 N

a=\dfrac{P}{m}

a=\dfrac{352\ N}{68\ kg}

a=5.17\ m/s^2

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A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. We may conclude that the mag
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