Question

The heart of man pumps 4000 c.c. of blood through the arteries per minute at a pressure of 130 mm Hg. If the density of mercury is 13.6 × 10³ kg/m³, what is the power of the heart?

• A. 1.15 watt
• B. 2.30 watt
• C. 1.15 h.p.
• D. 0.115 h.p

Answer 1

Answer: (A)

1.15 watt

Answer 2

Power = Av³d

= (Av) (v²d)

= (volume per sec) × (pressure)

= $\frac{4000 \times 10^{–6}}{60}$ × (130 × 10^–3 × 13.6 × 10³ × 10)

= 1.15 watt