(a) (i) Explain latent heat.
(ii) State two factors that affect the rate of evaporation of a liquid

                    
(b) Explain each of the following observations:
(i)  On a dry day, water in a clay pot is cooler than water in a closed plastic container;
(ii) Food gets cooked faster in a pressure cooker than in an ordinary cooking pot.                  

                                                 
(c) State two effects of heat on a substance.  

                                         
(d)  A 40 V electric heater is used to supply a current of 12 A for 1400 s to a body of mass 1.5 kg at the melting point of the body.  The body melts and its temperature rises through 60\(^o\)C in an extra 72 s.  Determine the:
(i) latent heat of fusion of the body;

(ii)specific heat capacity of the body.