Question

a rickshaw puller pulls the rickshaw by applying a force of 100N. If the rickshaw moves with constant velocity of 36km/h, find the power of man.

Answer 1

It will be helpful to you....

Answer 2

Given:

• Force applied = 100 N
• Velocity = 36 km/hr

To find:

• Power of the man ?

Calculation:

First of all, convert the unit of velocity from km/hr to m/s:

• 1 km/hr = 5/18 m/s
• 36 km/hr = 36 × 5/18 = 10 m/s.

Now, we can say :

$P = \dfrac{work}{time}$

• Work can be written as the product of force and displacement.

$\implies P = \dfrac{ F\times d}{t}$

$\implies P = F\times \dfrac{ d}{t}$

$\implies P = F\times v$

• Putting necessary values in SI UNITS:

$\implies P =100 \times 10$

$\implies P =1000 \: watt$

So, power of the man is 1000 watt or 1 kilowatt.