Question

From a water fall, water is pouring down at the rate 100 kg per see on the blade of a turbine . If the height of the fall be 100 m, the power delivered to the turbine is approximately equal to

• A. 100 kW
• B. 1 W
• C. 1 kW
• D. 100 W

Answer 1

The correct option is A 100 kW

Given,

Rate of water fall, $\dot{m}=100kg{s}^{-1}$

Height of fall, $h=100m$

Energy on blade = potential energy of water fall

$E=\dot{m}gh=100\times 10\times 100=100kW$

Hence, energy is $100kW$