Page 174 - text book form physics kssm 2020

12. A substance has a mass of 250 g. Th e substance loses 5 625 J of heat when cooled. Th ere is
a 25°C drop in temperature.
(a) Calculate the specifi c heat capacity of the substance. Identify the substance based on
Table 4.2 on page 128.
(b) Explain the use of the substance based on its specifi c heat capacity.

13. Photograph 3 shows a bamboo steamer. Amin receives an
order from a supermarket to supply 400 steamed buns per
day. Suggest and explain the design of the steamer needed.
Th e steamer should be durable, and able to prepare a large
quantity of steamed buns in a short time.

Photograph 3

Enrinchment Corner
Enrinchment Corner

14. Khairi orders a cup of coff ee in a restaurant. He fi nds that the coff ee is too hot.
Photograph 4 shows two suggested ways to cool the coff ee.

Ice
Ice

Ice
Ice

Method A Method B

Photograph 4
(a) Discuss the suitability of methods A and B to cool the coff ee in the cup.
(b) State your choice. Give reasons for your choice.

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