# Physical Science

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When you do 100 J of work on the handle of a bicycle pump, the pump does 40 J of work pushing the air into the tire. What is the efficiency of the pump?

• Physical Science -

• Physical Science -

Efficiency is "Efficiency = (useful work output / work input)"

So the problem would look like:
EC = (40/100)

Divide 40 by 100, and you get 0.4 - which is 40%.

• Physical Science -

A river does 6,500 J of work on a water wheel every
second. The wheel’s efficiency is 12%.
a. How much work in joules can the axle of the
wheel do?
b. What is the power output of the wheel in 1 s?

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