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May 22, 2015

Homework Help: Thermodynamic Physics

Posted by Kristal on Sunday, January 13, 2013 at 10:25pm.

When a driver brakes an automobile, friction between the brake disks and the brake pads converts part of the car's translational kinetic energy to internal energy. If a 1500 kg automobile traveling at 42 m/s comes to a halt after its brakes are applied, how much can the temperature rise in each of the four 3.5 kg steel brake disks? Assume the disks are made of iron (cp = 448 J/kgC) and that all of the kinetic energy is distributed in equal parts to the internal energy of the brakes.

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