cameroon gce ordinary level June 2021 physics 2

cameroon gce ordinary level June 2021 physics 2

cameroon gce ordinary level June 2021 physics 2

Define
(
i) Energy
( ii) Power
. (2 marks)
(b) A waterfall is 80 m high. If at a certain instant, 220 kg of water fall to the bottom of the waterfall:
(i) Calculate the potential energy of this
mass of water at the top of the water fall.
(ii) Explain why the water at the bottom of the waterfall is warmer than that at the top.
(
iii)Name any machine used at a building site and state its use.
(2 marks)
(1 mark)
(2
marks)
2. A simpleweighing machine was constructed from a uniform metal bar of length 1J m and of mass 7.0 kg. It was
pivoted at 0.4
m from one end, as shown in Figure 1. A bag of cocoa of mass 80 kg was placed at

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