Track 2 Form 3 Physics Worksheet - Annual Examinations For Secondary Schools, 2014 Page 10
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i) Given that the density of sea water is 1050 kg/m
, calculate the water pressure at that depth.
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Figure 12
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ii) The pilot window has an area of 0.15 m
. Calculate the force due to the water acting on it.
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iii) Whilst going down the pressure inside the submersible was kept unchanged at
atmospheric pressure. Explain why.
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8. This question is about specific heat capacity.
a) The iron block and the aluminium block in Figure 13 have a mass of 1 kg each.
Iron block
Aluminium block
Figure 13
i) Explain in terms of ‘density’ why the iron block is smaller in size.
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ii) Identical heaters are used to heat each block. Calculate the power of the heater if it
changes 900 J of electrical energy into heat energy every 20 seconds.
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iii) The specific heat capacity of iron is 450 J/kg°C while that of aluminium is 900 J/kg°C.
When both blocks that are initially at room temperature are heated for five minutes it is
noted that the iron block reaches a higher temperature than the aluminium one. Explain.
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Physics – Secondary Schools – Track 2 – Form 3 – 2014
Page 10 of 12
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