Physics 9702 · AS & A Level · Gravitational potential energy and kinetic energy

Gravitational potential energy and kinetic energy — practice question

At a hydroelectric power station, a turbine is located $30\,\text{m}$ beneath the surface of a large lake. Water flows through the turbine at a rate of $340\,\text{m}^3$ per minute. The turbine and generator system has an overall efficiency of $90\%$. Determine the output power of the power station. (The density of water is $1000\,\text{kg m}^{-3}$.)

  • A$0.15\,\text{MW}$
  • B$1.5\,\text{MW}$
  • C$1.7\,\text{MW}$
  • D$90\,\text{MW}$

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