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Work, Energy, and Power · Paper 2 — Free Physics HL Practice Questions

1FoundationSAQ-SPower and efficiency5 marksPaper 2~8 min

Data

g=9.81 m s−2g = 9.81 \text{ m s}^{-2}
A pump is used to lift water from a well 25 m deep at a rate of 200 kg per minute. The water is discharged at ground level with a speed of 4.0 m s−14.0 \text{ m s}^{-1}. The pump has an overall efficiency of 70%.
(a)
State the useful energy conversions that take place as the pump operates. [1 mark]
(b)
Identify one source of energy loss in the pump system and state the form in which this energy is dissipated. [1 mark]
(c)
Calculate the electrical power input required to operate the pump. [3 marks]
diagram

Solutions

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