Question

the power of a motor pump is 2 kilowatt how much water per minute the pump can raise to a height of 10 metre takes G is equal to 10 metre per second square

(is question Mein potential energy hi Kyon Lenge)​

Answer 1

We take Potential Energy, Because we are given height to calculate energy and Potential energy is a measure of g, mass,and height.

Given:

• power, P = 2 KW or 2000 W
• acceleration due to gravity, g = 10 m/s²
• height, h = 10 m

We know,

$\qquad P = \frac{Energy \: consumed}{Time \: taken} \\ \quad 2000 = \frac{E}{60} \\ \quad Energy = 2000 \times 60 = \bold{120000 \: Joules}$

We know,

$\qquad \boxed{E_{P.E} = mgh} \\ \qquad 120000 = m \times g \times h \qquad$

( Because the water motor can work 120000 Joules per minute )

$\qquad 120000 = m \times 10 \times 10 \\ \qquad 120000 = 100 \times m \\ \qquad m = \frac{120000}{100} = 1200$

We get mass = 1200 Kg

Since 1 Kg = 1 L

Therefore, 1200 Liters of water will be raised by the motor in one minute.