Question

The lungs perform 3.6J of work during each expansion then the number of times per minute do they expand if their power is 3W​

Answer 1

Answer:50

Explanation:

Work done /time =power

(3.6 x no. Of times expanded)/time=3watt

3.6 x n/60sec =3

Therefore

n=50

Answer 2

Given :

Work done by lungs during each expansion (W) = 3.6 J

Power (P) = 3 W

To Find :

The number of times per minute do the lungs expand.

Solution :

We know,

      Power (P) =  $\frac{Work Done (W)}{Time (T)}$

⇒        3           = $\frac{3.6}{Time (T)}$

⇒    Time (T)    =  1.2 sec

In 1.2 seconds, number of times the Lungs expand = 1

In 60 seconds, number of times the Lungs expand = $\frac{1}{1.2}$ × 60

                                                                                     =  50

∴ The number of times per minute the lungs expand if their power is 3W is 50.