First slide

Power

Question

The power of a heart which pumps $5 \times 10^{3} cc of blood per minute at a pressure of 120 mm of mercury (g = 10 {ms}^{- 2})$ and density of Hg = $13.6 \times 10^{3} kg / m^{3}) is$

Moderate

Solution

Work done = PV
Here P = $ρgh$
P = 13.6 $\times 10^{3}$ $\times 10 \times 120 \times 10^{- 3}$
W = PV = 16320 $\times 5 \times 10^{- 3}$
P = $\frac{w o r k}{t i m e}$ = $\frac{16320 \times 5 \times 10^{- 3}}{60}$

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