Physics Half-Yearly Examinations Form 3 - Kullegg Maria Regina, 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 mass.
_______________________________________________________ [1]
(ii) Calculate their total weight in Newtons.
________________________________________________________ [2]
(iii) 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]
(iv) Ryan then stands on one leg with Isaac still on his shoulders.
Underline the correct words:
• Their weight (remains the same, increases, decreases).
• The area in contact with the ground (remains the same, increases, decreases).
• The pressure exerted on the ground (remains the same, increases, decreases).[3]
b) Ryan’s favourite hobby is scuba diving.
Pressure in liquids is calculated by: P = h ρ g
(i)
What do the following symbols mean?
h = __________________________
ρ = __________________________
g = __________________________
[3]
3
(ii)
If the density of sea water is 1050 kg/m
, calculate the pressure caused by sea
water on Ryan at a depth of 14 m.
_________________________________________________________________ [2]
(iii) What happens to the pressure on Ryan when he starts to rise to the surface?
_________________________________________________________________ [2]
Physics Half yearly exam 2013 – Track 2 - Form 3
Page 8 of 10
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