9. Work & Energy
Power
Problem 20.65b
Textbook Question
Textbook Question(II) Energy may be stored by pumping water to a high reservoir when demand is low and then releasing it to drive turbines (Fig. 20–15) during peak demand. Suppose water is pumped to a lake 105 m above the turbines at a rate of 1.00 x 10⁵ kg/s for 10.0 h at night.
(b) If all this energy is released during a 14-h day, at 75% efficiency, what is the average power output?
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