Question

A car of total mass 1000 kg is moving horizontally, with the engine o ,
at initial speed 10 m s?1. The brakes are applied, causing the nal speed to
be 8 m s?1 and the brakes to increase in temperature by 2 K. If the mass of
the brakes is 10 kg, nd the speci c heat capacity of the brakes, assuming
no energy transfer to or from the car, and ignoring additional e ects.

Answer 1

Here we use energy conversion from mechanical to heat, and concept of specific heat,

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lost energj athears a heat Sb = [400 J/kg. K -specific hat cabac of the brakes