Answer to Question 3

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(a) The time taken is only relevant if we are interested in power.

 

(b)  Formula first:  Q = mcDq

Temperature change = 58 o C - 23o C = 35 o C (= 35 K)

Energy = 43120 J - 31225 J = 11895 J

11895 J = 1.25 kg Specific heat 35 K 

Specific heat =     11895 J           =  272 J kg-1 K-1 

                       1.25 kg 35 o C