Physics Annual Examination Worksheet '- Educational Assessment Unit, 2014 Page 9
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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) The pressure inside the submersible was kept at around 100 kPa. Explain why.
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8. This question is about specific heat capacity.
a) An iron block and an aluminium block have a mass of 1 kg each.
Iron block
Aluminium block
Figure 10
i) Explain why the two metal blocks have the same mass even though 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.
Given that initially the two blocks are at room temperature, which one will reach the
higher temperature after being heated for five minutes. Explain.
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iv) Name the process by which heat is transferred through each block.
_____________________________________________________________________ [1]
v) A liquid-in-glass thermometer is used to measure the temperature of each block. Name
the process through which the liquid inside the thermometer rises when heated.
_____________________________________________________________________ [1]
Physics – Form 3 Secondary – Track 3 – 2014
Page 9 of 10
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