﻿ The heart of a man pumps 5 L of blood through  the arteries per minute at a pressure of 150 mm of mercury . If the density of mercury be 13.6 x 103 kg/ m3 and g = 10 m/s2, then the power of heart in watt is   from Physics Work, Energy and Power Class 11 Manipur Board

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

• 1.70

• 2.35

• 3.0

• 1.50

A.

1.70

Given, pressure = 150 mm of Hg
Pumping rate of heart of a man

=

Given, pressure = 150 mm of Hg
Pumping rate of heart of a man

=

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What is watt?

SI unit of power is Watt.
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Define watt.

Power is said to be one watt if one joule of work is done in one second.
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What are different units of energy?

The different units of energy are :

(i) Joule
(ii) Erg
(iii) eV
(iv) KWh
(v) Calorie.

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Define the unit joule.

Work done is said to be one joule if one newton of  force displaces the body through a distance of one meter in the direction of applied  force .
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Is work a scalar or a vector quantity?

Work is dot product of two vectors. i.e. .

And dot product is a scalar quantity. Therefore, work is a scalar quantity.
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