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Calculate the power of the human heart, which beats $72$ times per minute and does $1.5 J$ of work every beat?

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1.8 W

1.5 W

3 W

2 W

answer is A.

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Detailed Solution

The power of the human heart, which beats

72

times per minute and does

1.5 J

of work every beat is

1.8 W

.
In general, power is given by

P = nW / t

where n is the number of times, W is the work done and t is the time.

Work done, W = 1.5 J; Number of beats = 72; Time taken, t = 1 minute = 60 s

Therefore,

P = (72 \times 1.5) / 60

= > P = 1.8 W

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