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1.7 Energy, work and power

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Question 206

A crane of constant power P P\,P is used to lift a crate of mass m m\,m vertically through a height h h\,h in a time ttt. The acceleration of free fall is ggg. Which equation can be used to calculate the height hhh?

A

h=Ptmgh = \frac{Pt}{mg}h=mgPt​

B

h=Pmgth = \frac{P}{mgt}h=mgtP​

C

h=tPmgh = \frac{t}{Pmg}h=Pmgt​

D

h=mgtPh = \frac{mgt}{P}h=Pmgt​

Markscheme

1.7 Energy, work and power Questions

  1. IGCSE
  2. /Physics
  3. /1.7 Energy, work and power

533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.

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