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# HW 6 - HW 6 1 A The string in the figure is L = 140.0 cm...

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HW 6 1) The string in the figure is L = 140.0 cm long, and the distance d to the fixed peg at point P is 87.5 cm . When the initially stationary ball is released with the string horizontal as shown, it will swing along the dashed arc. A. What is its speed when it reaches its lowest point? B. What is its speed when it reaches its highest point after the string catches on the peg?

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2) In the figure, a block slides along a track from one level to a higher level, by moving through an intermediate valley. The track is frictionless until the block reaches the higher level. There a frictional force stops the block in a distance d. The block's initial speed is 6.3 m/s ; the height difference h is 0.92 m ; and the coefficient of kinetic friction is 0.60. Find d.
3) Each second, 1050 m 3 of water passes over a waterfall 115 m high. Three-fourths of the kinetic energy gained by the water in falling is transferred to electrical energy by a hydroelectric generator.

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