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Brut [27]
3 years ago
10

An ECE110 student decides to "go off the grid" and powers his house by batteries. On the first day, the electric power usage for

the household was 29 kW-h. He must recharge his batteries using a bicycle-powered generator with 92 % efficiency. For how many hours must he now pedal the bicycle at a peak power of 560 W in order to recharge to the batteries?
Engineering
1 answer:
-Dominant- [34]3 years ago
6 0

Answer:

47.6 hours

Explanation:

Efficiency = energy output/energy input

Efficiency = 92% = 0.92

Energy output = power × time = 560/1000 kW × t = 0.56t kW-h

Energy input = 29 kW-h

0.92 = 0.56t/29

0.56t = 0.92×29

0.56t = 26.68

t = 26.68/0.56 = 47.6 hours

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Answer:  Fracture will not occur since Kc (32.2 MPa√m) ∠ KIc (35  MPa√m).

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