You drop a 2.40 kg textbook to a friend who stands on the ground 10.0 m below th

Question

You drop a2.40kg textbook to a friend who stands on the ground 10.0 m below the textbook with outstretched hands 1.50 m above the ground (Fig. 8-24).

You drop a2.40kg textbook to a friend who stands on the ground 10.0 m below the textbook with outstretched hands 1.50 m above the ground (Fig. 8-24). (a) How much workWgis done on the textbook by its weight as it drops to your friend's hands? (b) What is the change?Uin 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 energyUwhen the textbook is released? (d) If the gravitational potential energy of that system is zero at ground level, what is its potential energyUwhen the textbook reaches the hands? (e) How much workWgis done on the textbook by its weight as it drops to your friend's hands ifUis 100 J at the ground level. (f) What is the change?Uin the gravitational potential energy of the textbook-Earth system during the drop ifUis 100 J at the ground level. (g) FindUat the release point whenUis 100 J at the ground level. (h) FindUat the hands whenUis 100 J at the ground level.

Explanation / Answer

W=Fd F=mg W=mgd=(2.4)(9.8)(10-1.5) = 199.92J PE=mgh note this is the same formula as work above. so the answer is 315.2J a swell

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