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A candy bar supplies your muscles with energy. If your muscles are 40% efficient, how much work can they perform if the candy contains 800 J?

User Dhorat
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1 Answer

5 votes

Answer:

The muscles can perform 320 J of work.

Step-by-step explanation:

Let the work performed by the muscles be
W_(out) J.

Efficiency of a body is given as the ratio of useful work to that of work supplied.

Here, the work provided by the candy bar is,
W_(in)=800\ J

Efficiency of the muscles is,
\eta =40\%=0.40

Now, we know that,


\textrm{Efficiency,}\ \eta=(W_(out))/(W_(in))\\0.40=(W_(out))/(800)\\W_(out)=0.40* 800=320\ J

Therefore, the work performed by the muscles is 320 J.

User Shinkou
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