Annual Examinations For Secondary Schools Physics Worksheet - 2012 Page 3
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123.
The figure represents a uniform concrete beam PQ resting on two identical supports X and Y.
4m
a.
Mark on the diagram with a letter ‘C’,
0.5m
the centre of gravity of the beam PQ. (1)
P
0.3m
Q
b.
Calculate the:
i.
volume of the concrete beam PQ,
Y
X
______________________________________________
(2)
ii.
density of the concrete beam PQ given that its mass is 1440 kg,
________________________________________________________________________________
(2)
c.
i.
The weight of the beam PQ carried by each support is 7200 N. Calculate the total
weight of the beam PQ ___________________________________________________
(2)
2
ii.
The total area of contact between the beam and the supports is 0.4 m
. Calculate the
total pressure exerted by the concrete beam on these supports.
________________________________________________________________________________
________________________________________________________________________________
(3)
4.
Magnets are made up of magnetic materials.
a.
i.
Magnetic materials are _______________ by both poles of a magnet.
ii.
Two common magnetic materials are _____________ and _____________.
(3)
b.
Draw the magnetic field around a bar magnet.
S
N
(3)
c.
The figure below shows a plotting compass.
i.
In which direction does a plotting compass point?
___________________________________________________________
(2)
ii.
State one use of the plotting compass.
___________________________________________________________
(2)
Physics – Secondary Schools - Track 2 – Form 5 – 2012
Page 3 of 12
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