Problem 21.07 A steady device operates on the 600-W output of a motor. The devic

Question

Problem 21.07

A steady device operates on the 600-W output of a motor. The device runs at 20 Hz and can convert67 % of its input to usable power to pump water.

Part A

How much thermal energy does the device output per cycle?

Express your answer with the appropriate units.

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Part B

How much thermal energy does the device output in 8.0 h?

Express your answer with the appropriate units.

Problem 21.07

A steady device operates on the 600-W output of a motor. The device runs at 20 Hz and can convert67 % of its input to usable power to pump water.

Part A

How much thermal energy does the device output per cycle?

Express your answer with the appropriate units.

SubmitMy AnswersGive Up

Part B

How much thermal energy does the device output in 8.0 h?

Express your answer with the appropriate units.

Explanation / Answer

Part A:

Output by the motor at 67% efficiency = 600*0.67 = 402 W

Frequency = 20 Hz

Hence, thermal energy output of the equipment per cycle = 402/20 = 20.1 J

Part B:

Thermal energy output of the device in 8.0 h = 402*8 = 3216 Wh = 3.216 kWh

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