O-LevelPhysicsEnergy & Work5054/12 · Oct/Nov 2017 · Q91 Mark
In a hydroelectric power station, 4.2 × 10⁵ kg of water passes through the turbines every second. The turbines are at a height of 50m below the surface of the reservoir. The gravitational field strength g is 10N/kg. Assuming there are no energy losses, what is the power output of the power station?
A8.4 x 10³ W
B8.4 x 10⁴ W
C2.1 x 10⁷ W
D2.1 × 10⁸ W
✓ Correct answer
D: 2.1 × 10⁸ W
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