9. Work & Energy
Power
5:26 minutes
Problem 20.65a
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.
(a) How much energy (kWh) is needed to do this each night?
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