Physics Annual Examination Worksheet '- Educational Assessment Unit, 2014 Page 8
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107. This question is about density and pressure in liquids.
a) Explain in terms of density why a plastic spoon floats in water while a steel spoon sinks in
water.
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b) Tim is asked to find the density of a liquid. He is given a beaker filled with liquid, a
measuring cylinder and a digital balance. Describe how he carries out this experiment.
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c) Tank A is a large wide tank which is filled with water. Tank A needs to be painted and all
the water needs to be transferred into tank B.
i) Will the water pressure at the bottom of
tank B be greater than, smaller than or
tap
equal to the water pressure at the bottom
of tank A? Give a reason for your answer.
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Tank B
Tank A
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Figure 9
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ii) Tank B has two taps as shown in the diagram. Draw (on Tank B) how water would flow
out of each tap when turned on at the same time.
[1]
d) On March 26, 2012, film director James Cameron reached the deepest known underwater
point on Earth inside a special submersible. The depth of the sea at this point was 10 900 m.
3
i) Given that the density of sea water is 1050 kg/m
, calculate the water pressure at that depth.
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Physics – Form 3 Secondary – Track 3 – 2014
Page 8 of 10
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