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The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150mm of mercury. If the intensity of mercury be 13.6 x 10³ kg/m³ and g=10 m/s² then the power of heart in watt is
Options
(a) 3
(b) 1.5
(c) 1.7
(d) 2.35
Correct Answer:
1.7
Explanation:
WORK DONE W = F X D
F = PA (PRESSURE X AREA)
OR W = P A.D = P (AD) = P V
OR WORK DONE = PRESSURE X VOLUME
Given P = 150mm OF Hg = 105 * 150/760
= 15 x 105 / 76 Pa
Volume, V = 5L = 5000 cm3 = 5×10-3 m3
So, W = PV = (15 x 105 / 76 ) x 5×10-3
Work Done = 98.68 Joules
Now pumping of 5L of blood is done in 1 min = 60 seconds
So, Power = Work done / time
OR POWER = 98.68 /60 = 1.64 watts
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Topics: Work Energy and Power
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A gas of monoatomic hydrogen is bombarded with a stream of electrons
- A student measures the terminal potential difference (V) of a cell
- What is the value of Ā+A in the Boolean algebra?
- Electrons used in an electron microscope are accelerated by a voltage of 25 kV
- A body of mass 2 kg is moved by a force F=3x where x is the distance covered.
Topics: Work Energy and Power (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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