ch07-p019 - 19(a We use F to denote the magnitude of the...

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(b) The force of gravity is in the same direction as the displacement, so it does work g WM g d = . (c) The total work done on the block is −+ = 34 4 Mgd . Since the block starts from rest, we use Eq. 7-15 to conclude that this 4 bg is the block’s kinetic energy K at the moment it has descended the distance d . (d) Since 2 1 2 , KM v = the speed is v K M Mgd M gd == = 22 4 2 (/ ) at the moment the block has descended the distance d . 19. (a) We use F to denote the magnitude of the force of the cord on the block. This force
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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