First slide

Power

Question

If the heart pushes 1 cc of blood in one second under pressure 20000 N/m² the power (in W) of heart is

Moderate

Solution

$Power = \frac{workdone}{time} = \frac{pressure \times change in volume}{time}$
$= \frac{20000 \times 1 \times 10^{- 6}}{1} = 2 \times 10^{- 2} = 0 .02 W$

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