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The average work done by a human heart w...

The average work done by a human heart while it beats once is `0.5 J`. Calculate the power used by heart if it beats `72` times in a minute.

A

0.4W

B

0.6w

C

0.8W

D

0.2W

Text Solution

Verified by Experts

The correct Answer is:
B
No. of bullets/sec `=(240)/(60)=4, m =10xx10^(-3)kg`
Power `=("Work done")/("sec.")=("Total K.E.")/("sec.")`
`=(1)/(2)nmv^(2)=(1)/(2)xx4xx10xx10^(-3)xx600xx600`
`=72xx10^(2)W=7.2xx10^(3)W=7.2 KW`
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