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Question

Each time the heart beats, it requires 5 J of energy. If it beats 72 times in one minute then the power consumed by the heart is 360 W. State true or false.


  1. 4W

  2. 2W


Solution

The correct option is A

4W


Power is defined as the work done per unit time.
The heart beats 72 times in one minute. So, in one second it would beat 7260 times and in one beat it consumes an energy of 5J, so in 7260 times it would consume 7260×5=6 J
Hence, Power =6 W

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