Question

Please help! I'm begging anyone! This is urgent! These are the problems in physics I am having difficulty with!

1) While helping a friend move, you lift a 189 N box full of books and perform 174 J of work to do so. What distance, directly upward, do you lift the box? Show all of your work.

2) A bungee jumper with a weight of 613 N leaps off a bridge. He is in free fall for a distance of 22.6 m before the cord begins to stretch. How much work, in kilojoules, does the force of gravity do on the jumper before the cord begins to stretch? Show all of your work.

3) You and your neighbor are shoveling snow. If your neighbor pushes a shovel four times as far as you do, but exerts only half the force, which one of you does more work and by how much? Show all of your work.

Answer 1

Answer:

1.

Distance = 0.921 meters

2.

Work = 13.9 kJ

3.

The neighbor

Double your work

Explanation:

1.

Work = Force × Distance

Distance = Work / Force

Distance = 174J /189 N

Distance = 0.921 meters

2.

Work = force × distance

Work = (613 N) (22.6 m)

Work = 13,900 J

Work = 13.9 kJ

3.

Work is a product of force and distance, expressed as W=Fd where W is work in Nm, F is applied force and d is the distance in m

Since your neighbor pushes 4 times then you just push 1m when he pushes 4m, that is an example. Also, since the neighbor only exerts half the force i.e. 0.5N then you exert full force of 1N

Work from your neighbor will be 4d*0.5F=2dF

Work from you will be dF

Clearly, 2dF=2(dF) hence the neighbor exerts double work

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