A 10 kg iron disk brake on a car is initially at 10 61616 C suddenly the brake pad hangs up, increasing the brake temperature by friction to 110 61616 C while the car maintains constant speed Find the change in availability of the disk and the energy depletion of the cars gas tank due to this proce...

All the friction work is turned into internal energy of the disk ...

A 10-kg iron disk brake on a car is initially at 10C; suddenly the brake pad hangs

Question:

A 10-kg iron disk brake on a car is initially at 10C; suddenly the brake pad hangs up, increasing the brake temperature by friction to 110C while the car maintains constant speed. Find the change in availability of the disk and the energy depletion of the car’s gas tank due to this process alone. Assume that the engine has a thermal efficiency of 35%.