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Classical Mechanics Level 2

The lungs perform 2.4 J of work during expansion . How many times per minute do they expand if their power is 2 W?


The answer is 50.

Kartik Arjaria by Kartik Arjaria , 21, India

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3 solutions

Noel Lo
May 27, 2015

2 W × 1 m i n = 2 J s − 1 × 60 s = 120 J 2 W \times 1 min = 2 Js^{-1} \times 60 s = 120 J

120 2.4 = 50 \frac{120}{2.4} = \boxed{50}

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Tushar Malik
Sep 6, 2014

Remember the formula P=E/T i.e Power=work in Joules/Time( in seconds) and you will be able to solve it.

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Kartik Arjaria
Aug 29, 2014

work done in one expansion = 2.4 J , time=60 sec. let number of expansion be x , so work=2.4*x

power=work/time 2=2.4*x/60 x=50

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