Physicshard · Past Paper
A human heart discharges 75 cc of blood at each beat against a pressure of 0.1 m of Hg. If the pulse rate is 80 per minute, the power of the heart is (density of Hg=13.6g/cc):
A1.33 W
B1.76 W
C2.0 W
D1.0 W
✓ Correct Answer: A — 1.33 W
Work per beat = Pressure * Volume. Power = (W/beat * beats/min) / 60. Converts to approx 1.33 Watts.
Share this question
More from Physics
- The KE of a body is 100 J and its mass is 2 kg. Its velocity is:
- The point on the principal axis where all rays parallel to the principal axis meet after reflection is:
- The displacement of a particle is given by x = (t - 2)^2. When will the velocity be zero?
- A body moves from A to B with 40 km/h and returns with 60 km/h. The average velocity is:
- A body moving with a speed of 36 km/h is moving with how many m/s?