You drop a 2.30 kg textbook to a friend who stands on the ground at distance...

You drop a 2.30 kg textbook to a friend who stands on the ground at distance D = 10.0 m below. Your friend's outstretched hands are at distance d = 1.50 m above the ground.

(a) How much work W_g does the gravitational force do on the book as it drops to her hands?
(b) What is the change ΔU in the gravitational potential energy of the textbook-Earth system during the drop?
(c) If the gravitational potential energy of that system is zero at ground level, what is its potential energy U when the textbook is released?
(d) If the gravitational potential energy of that system is zero at ground level, what is its potential energy U when the textbook reaches the hands?
(e) How much work W_g is done on the textbook by its weight as it drops to your friend's hands if U is 100 J at the ground level.
(f) What is the change ΔU in the gravitational potential energy of the textbook-Earth system during the drop if U is 100 J at the ground level.
(g) Find U at the release point when U is 100 J at the ground level.
(h) Find U at the hands when U is 100 J at the ground level.

Expert Solution

genius_generous answered 2 years ago

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