Question

The work done by the heart is $1J$ per beat. Calculate the power of the heart if it beats $72$ times in a minute.

• A. $1.2hp$
• B. $1.2eV{s}^{-1}$
• C. $1.2W$
• D. None of these

Answer 1

Answer: (C)

$1.2W$

Number of beats in a minute = $72$
So, number of beats per second$=\frac{72}{60}=1.2$
Power of heart = work done per second = work done per beat $\times$ number of beats in a second $=1J\times 1.2s^{-1}=1.2W$