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Physics Worksheet - Half-Yearly Examination - Kullegg Maria Regina Boys' Secondary School - 2013-2014 Page 5

ECTION

This section carries 45 marks.

6. This question is about the pressure in liquids.

A fish is swimming in the sea at a depth of 18 m. The density of

sea water is 1100 kg/m

and atmospheric pressure is 101 kPa.

a) Calculate the pressure exerted by the sea water on the fish at that depth.

_______________________________________________________________

[2]

b) What is the value of the atmospheric pressure in pascals (Pa)?

_______________________________________________________________

[1]

c) Calculate the total pressure exerted on the fish.

_______________________________________________________________

[1]

d) The fish swims to a different point and the total pressure on it becomes 255 000 Pa.

(i) What is the pressure due to the water only?

_______________________________________________________________

[1]

(ii) Show (through calculation) that at that point the water is 14 m deep.

_______________________________________________________________

[2]

e) The table below shows how the water pressure increases with depth as the fish

swims from the water surface to the sea bed.

Depth (m)

Water pressure (kPa)

110

165

220

275

(i) On the graph paper, plot a graph of water pressure (kPa) on the y-axis against

depth (m) on the x-axis.

[5]

(ii) What is the relationship between water pressure and depth?

________________________________________________________________

[1]

(iii) Using the graph, find the:

 water pressure at a depth of 9 m ____________________________

[1]

 depth at which the water pressure is 132 kPa ___________________

[1]

Page 5 of 9

Physics Half yearly exam 2014 – Track 3 - Form 3

Physics Worksheet - Half-Yearly Examination - Kullegg Maria Regina Boys' Secondary School - 2013-2014 Page 5