A-LevelPhysicsWork, energy and power9702/12 · May/June 2015 · Q161 Mark
The diagram shows a hydroelectric power station. [Figure showing a reservoir, a pipe (penstock) leading down to a turbine house, and points X (in reservoir) and Y (just before turbine).] The reservoir is linked to the turbines by a pipe of uniform cross-sectional area. Water flows from X to Y at constant speed. Which statement about the change of energy of the water as it moves from X to Y is correct?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
AIt gains both gravitational potential energy and kinetic energy.
BIt loses both elastic potential energy and kinetic energy.
CIt loses both elastic potential energy and gravitational potential energy.
DIt loses gravitational potential energy and gains elastic potential energy.
✓ Correct answer
D: It loses gravitational potential energy and gains elastic potential energy.
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