ch08-p115 - 115. (a) During one second, the decrease in...

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115. (a) During one second, the decrease in potential energy is −=−=× ΔΔ Um g y () ( . 55 10 6 kg) 9.8m s (50 m) 2.7 10 J 2 9 di where + y is upward and Δ y = y f y i . (b) The information relating mass to volume is not needed in the computation. By Eq. 8-40 (and the SI relation W = J/s), the result follows: P = (2.7
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