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The heart of man pumps 5 litres of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be 13.6 × 10³ kg/m³ and g = 10 m/s² then the power of heart in watts is

1. 2.35
2. 3.0
3. 1.50
4. 1.70

Correct answer: 2.35

Solution

The power of the heart is calculated using the formula Power = Pressure × Volume flow rate. First, convert the pressure from mm of mercury to Pascals: P = 150 × 13.6 × 10³ × 10 = 2.04 × 10⁵ Pa. The volume flow rate is 5 L/min = 5/60 m³/s. Thus, Power = 2.04 × 10⁵ × (5/60) = 2.35 W.

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