Physics Worksheet - Annual Examinations For Secondary Schools, 2015 Page 11
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12b) Name the instrument they need to find the mass of the sea water.
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c) Explain what they need to do to find the mass of the sea water.
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d) Name the instrument they need to find the temperature of the sea water.
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e) What is the use of the stirrer?
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f) The initial temperature of the sea water is 20 °C and the final temperature is 35 °C. Calculate the
change in temperature.
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g) What is assumed during the experiment regarding heat losses?
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h) Give any two precautions related to this experiment.
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i) The mass of sea water is 0.30 kg and the joulemeter reading is 18000 J. Calculate the specific heat
capacity of sea water.
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j) Nadia reads in a physics book that the specific heat capacity of pure water is 4200 J/kg °C.
i) Salt (increases / decreases) the specific heat capacity of pure water.
[1]
ii) Which boils more quickly from the same temperature, 1 kg of pure water or 1 kg of salt water?
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Physics – Form 5 Secondary – Track 2 – 2015
Page 11 of 12
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