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Work done by the heart, W = PΔV where pressure P = ρgh and h = 150 mm = 0.15 m, g = 10 m/sec², ρ = 13.6 × 10³ kg/m³. Find the power.

1. Power = W/t = PΔV/t
2. Power = ρgh × 5 × 10⁻³/60
3. 13.6 × 10³ × 10 × 0.15 × 5 × 10⁻³/60
4. 1.7 watt

Correct answer: 1.7 watt

Solution

The work done by the heart is calculated using W = PΔV, where P = ρgh. Substituting the given values and dividing by time gives the power. The final result simplifies to 1.7 W.

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