Physics Half Early Exam - Maria Regina College, Mosta Secondary School Zokrija, 2012/2013 Page 8
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107.
This question is about pressure.
Isaac
a) Ryan is lifting his younger brother Isaac on his shoulders. Ryan has a
mass of 60 kg while Isaac has a mass of 30 kg.
Ryan
(i) Calculate their total weight in Newtons.
________________________________________________________ [2]
(ii) The total area of contact of Ryan’s shoes while standing on both legs
2
2
is 360 cm
. Calculate the total pressure on the ground in N/cm
.
_________________________________________________________________ [2]
(iii) Ryan tries to stand on one leg with Isaac still on his shoulders. Work out the
new pressure he exerts.
_________________________________________________________________ [2]
b) Ryan’s favourite hobby is scuba diving.
(i)
Name the three factors which affect the pressure in liquids.
_______________________________________________________
_______________________________________________________
_______________________________________________________
[3]
3
(ii)
If the density of sea water is 1050 kg/m
, calculate the:
• pressure caused by sea water at a depth of 14 m.
_________________________________________________________________
_________________________________________________________________ [2]
total pressure at a depth of 14 m, if the atmospheric pressure is 101 kPa.
•
_________________________________________________________________ [2]
(iii) Why should Ryan rise to the surface very slowly?
_________________________________________________________________
_________________________________________________________________ [2]
Physics Half yearly exam 2013 – Track 3 - Form 3
Page 8 of 10
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