Physics 9702 · AS & A Level · Energy conservation

Energy conservation — practice question

A small diesel engine consumes a volume of $1.5 \times 10^{4}\,\text{cm}^3$ of fuel per hour and delivers a useful power output of $40\,\text{kW}$. It may be assumed that $34\,\text{kJ}$ of energy is transferred to the engine when it uses $1.0\,\text{cm}^3$ of fuel. Determine the rate at which energy is transferred from the engine as wasted energy.

  • A$102\,\text{kW}$
  • B$142\,\text{kW}$
  • C$182\,\text{kW}$
  • D$470\,\text{kW}$

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