Physics · Oct / Nov 2017 · Paper 12 · Question 9

In a hydroelectric power station, 4.2 × 10^5 kg of water passes through the turbines every second. The turbines are at a height of 50 m below the surface of the reservoir. The gravitational field strength g is 10 N / kg. Assuming there are no energy losses, what is the power output of the power station?

1. A8.4 × 10^3 W
2. B8.4 × 10^4 W
3. C2.1 × 10^7 W
4. D2.1 × 10^8 W

As printed in the paper