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timama [110]
3 years ago
9

A farmer uses 3450 J of energy on a wheel and axle to lift a 15 kg bucket of water 20 m to the top of her well. What is the effi

ciency of the system?
Physics
2 answers:
Anika [276]3 years ago
8 0

<span>Efficiency is the measure of how efficient a process is. It is used to assess the ability of a process in avoiding waste energy, materials, money and time in doing a desirable output. It is calculated as;

Efficiency = useful energy ouput / total energy input</span>

<span>Efficiency = 15(9.81)(20) / 3450 = 0.85</span>

faltersainse [42]3 years ago
5 0

Output= m*g*h = 15*9.8*20 = 2,940J


Input= 3450J (given)


Efficiency = output/input = 2,940/3450 = 0.85% efficient



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