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Standard XII

Physics

Average and Instaneous Power

If the heart ...

Question

If the heart pushes 1 cc of blood in one second under pressure 20000 $N / m^{2}$ the power of heart is:

0.02 W

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400 W

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20 mW

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0.2 W

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Solution

The correct option is A 0.02 W
Given that ,
Pressure , $P = 2000 N / m^{2}$
Change in Volume = $1 c c = 10^{- 6} L$

$Power = \frac{workdone}{time} = \frac{pressure \times change in volume}{time} = \frac{2000 \times 10^{- 6}}{1} = 0.02 W$

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When your heart beats, it contracts and pushes blood through the arteries to the rest of your body. This force creates pressure on the arteries. This is called (i)___________.

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If the heart pushes 1 cc of blood in one second under pressure 20000 N/m2 the power of heart is:

The correct option is A 0.02 WGiven that , Pressure ,P=2000N/m2Change in Volume = 1cc=10−6LPower=workdonetime=pressure × change in volumetime=2000×10−61=0.02 W

If the heart pushes 1 cc of blood in one second under pressure 20000 $N / m^{2}$ the power of heart is:

The correct option is A 0.02 W
Given that ,
Pressure , $P = 2000 N / m^{2}$
Change in Volume = $1 c c = 10^{- 6} L$

$Power = \frac{workdone}{time} = \frac{pressure \times change in volume}{time} = \frac{2000 \times 10^{- 6}}{1} = 0.02 W$