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Standard XII

Physics

Equation of Continuity

[ The...

Question

$\begin{matrix} The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150 m m of mercury. If the density of mercury be 13.6 \times 10^{3} k g / m^{3} and g = 10 m / s^{2} then the power of heart in watt is: \end{matrix}$

1.5

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1.7

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2.35

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Solution

The correct option is B 1.7
$\begin{matrix} \frac{d v}{d t} = \frac{5 \times 10^{- 3}}{60} m^{3} / s = p o w e r o f h e a r t = p . \frac{d v}{d t} = ρ g h . \frac{d v}{d t} [p = ρ g h] = \frac{(13.6 \times 10^{3} k g / m^{3}) (10) \times 0.15 \times 10^{- 3}}{60} = 1.70 W H e n c e, o p t i o n B i s c o r r e c t a n s w e r . \end{matrix}$

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Similar questions

Q. The heart of a man pumps

5

litres of blood through the arteries per minute at a pressure of

150 m m

of mercury. If the density of mercury be

13.6 \times 10^{3} k g / m^{3}

and

g = 10 m / s^{2}

then the power of heart in watt is:

Q. The heart of a man pumps

5 l i t r e s

of blood through the arteries per minute at a pressure of

150 m m

of mercury. If the density of mercury be

13.6 \times 10^{3} k g / m^{3}

and

g = 10 m / s^{2}

then the power of heart in watt is

Q. The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150

m m

of mercury. If the density of mercury is

13.6 \times 10^{3} k g / m^{3}

and

g = 10 m / s^{2}

, then the power of heart in Watts is

The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150 $m m$ of mercury. If the density of mercury is $13.6 \times 10^{3} k g / m^{3}$ and $g = 10 m / s^{2}$ , then the power of heart in Watts is

Q. The heart of a man pumps 5 liters of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be 13.6×10^3 kg/m^3 and g=10 m/s^2. Then the power of heart watt is 1) 1.50 2) 1.70 3) 2.35 4) 3.0

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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 density of mercury be 13.6×103kg/m3 and g=10m/s2 then the power of heart in watt is:

The correct option is B 1.7dvdt=5×10−360m3/s=powerofheart=p.dvdt=ρgh.dvdt[p=ρgh]=(13.6×103kg/m3)(10)×0.15×10−360=1.70WHence,optionBiscorrectanswer.

$\begin{matrix} The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150 m m of mercury. If the density of mercury be 13.6 \times 10^{3} k g / m^{3} and g = 10 m / s^{2} then the power of heart in watt is: \end{matrix}$