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)