Answer to Question #332162 in Molecular Physics | Thermodynamics for Charlton

Question

A car mass 1.0x105g travelling at 20m/s is brought to rest by applying the brakes. Assuming that the kinetic energy of the car becomes transferred to internal energy in four steel brake drum of equal mass, find the rise in temperature the drum if the total mass is 20kg, the specific heat capacity of the steel is 450J/kg and the work done is equal on all four drum

Answer 1

$\frac{mv^2}2=cm_1∆T,$

$∆T=\frac{mv^2}{2cm_1}=2 .2°C.$