The work done by the heart to beat one time is 1.2 J. If it beats 72 times in 1 minute, calculate the power of heart.

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0 watt

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1.2 watt

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Solution

The correct option is B
4W

Given, number of beats in one minute = 72

$∴$ Number of beats per second = $\frac{72}{60} = 1.2$

Power of heart = work done per second

= work done per beat x number of beats per second

= $1.2 J \times 1.2 s^{- 1}$

= $1.44 J s^{- 1} = 1.44 w a t t$

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