b) Energy may be stored for use during peak demand by pumping water to a high reservoirwhen needed. Suppose water is pumped to a lake 135 m above the turbines and at a rate of1.35 x 10 kgs" for 10 hrs at night.) How much energy (kWh) is needed to do this each night.i) If all this energy is released during a-14 h day, at 75% efficiency, what is the average poweroutput?e) State three forms of environmental polution and how they can be prevented.

Given: The height is h=135 m. The time is t=10 h. The rate is r=1.35X105 kg/s. Part (i) The…

b) Energy may be stored for use during peak demand by pumping water to a high reserveir when needed. Suppose water is pumped to a lake 135 m above the turbines and at a rate of 1.35 x 10 kgs" for 10 hrs at night. i) How much energy (kWh) is needed to do this each night. ii) If all this energy is released during a-14 h day, at 75% efficiency, wvhat is the average power output?

b) Energy may be stored for use during peak demand by pumping water to a high reserveir when needed. Suppose water is pumped to a lake 135 m above the turbines and at a rate of 1.35 x 10 kgs" for 10 hrs at night. i) How much energy (kWh) is needed to do this each night. ii) If all this energy is released during a-14 h day, at 75% efficiency, wvhat is the average power output?

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter18: Heat Engines, Entropy, And The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 42P

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Question

b) Energy may be stored for use during peak demand by pumping water to a high reservoir
when needed. Suppose water is pumped to a lake 135 m above the turbines and at a rate of
1.35 x 10 kgs" for 10 hrs at night.
) How much energy (kWh) is needed to do this each night.
i) If all this energy is released during a-14 h day, at 75% efficiency, what is the average power
output?
e) State three forms of environmental polution and how they can be prevented.

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