ch08-p003 - 3. (a) The force of gravity is constant, so the...

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3. (a) The force of gravity is constant, so the work it does is given by W Fd =⋅ G G , where G F is the force and G d is the displacement. The force is vertically downward and has magnitude mg , where m is the mass of the flake, so this reduces to W = mgh , where h is the height from which the flake falls. This is equal to the radius r of the bowl. Thus Wm g r == × × −− (. ) ( . 200 10 220 10 32 kg)(9.8 m s m) 4.31 10 J. 23 (b) The force of gravity is conservative, so the change in gravitational potential energy of
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