Physics Worksheet - Annual Examinations For Secondary Schools, 2013 Page 9

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(vi) The specific heat capacity of water is 4200 J/kg
C. Calculate the energy transferred
when 50 kg of water pass through the heat exchanges assuming that the most efficient
material is used.
___________________________________________________________________________
___________________________________________________________________________
(3)
(b)
The diagram shows a heat exchanger used in an
industrial laundry.
What is the advantage of
having a coiled pipe ?
____________________________________________
____________________________________________
__________________________________________ (2)
8.(a) Heavy furniture sometimes marks the floor on which it stands. Four tables A, B, C and
D of the same weight, have legs of different shapes as shown below.
(i)
Which leg is least likely to mark the floor underneath it? Explain your answer.
___________________________________________________________________________
(2)
2
(ii)
Leg A has an area of 30 cm
in contact with the ground. Calculate the total area of the
table in contact with the ground if the table has four legs.
__________________________________________________________________________
(1)
(iii) The mass of table A is 20 kg. Calculate the pressure exerted by the table on the floor.
___________________________________________________________________________
___________________________________________________________________________
(2)
Physics – Secondary Schools – Track 3 – Form 3 – 2013
Page 9 of 10

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