| ⇦ | 
| ⇨ |
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
Related Questions: - Ohm’s law valid
- A thermodynamic system undergoes cyclic process ABCDA as shown in figure
- A potentiometer wire has length 4m resistance 8Ω. The resistance that must be connected
- A boy standing at top of a tower of 20 m height drops a stone
- A tuning fork of frequency 512 Hz makes 4 beats per second with the vibrating string
Topics: Work Energy and Power
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Ohm’s law valid
- A thermodynamic system undergoes cyclic process ABCDA as shown in figure
- A potentiometer wire has length 4m resistance 8Ω. The resistance that must be connected
- A boy standing at top of a tower of 20 m height drops a stone
- A tuning fork of frequency 512 Hz makes 4 beats per second with the vibrating string
Topics: Work Energy and Power (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply