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A Level Specific Heat Capacity Questions

 

Q7. A bicycle and its rider have a total mass of 95 kg. The bicycle is travelling along a horizontal road at a constant speed of 8.0ms-1.

(a) Calculate the kinetic energy of the bicycle and rider.

(2 marks)

(b) The brakes are applied until the bicycle and rider come to rest. During braking, 60% of the kinetic energy of the bicycle and rider is converted to thermal energy in the brake blocks. The brake blocks have a total mass of 0.12 kg and the material from which they are made has a specific heat capacity of 1200 J kg-1 K-1.

(i) Calculate the maximum rise in temperature of the brake blocks.

(ii) State an assumption you have made in part (b)(i).

(4 marks)

(Total 6 marks)