A 750kg car moving at 23m/s brakes to a stop. The brakes contain about 15.0kg of iron that absorbs the energy. What is the increase in temperature of the brakes? (HINT: KEcar=Qbrakes) (ANSWER: 30 degrees Celsius)
1 Answer
Feb 1, 2018
The increase in temperature is
Explanation:
The kinetic energy of the car is
The mass of the car is
The velocity of the car is
The kinetic energy is
This energy is absorbed by the brakes.
The specific heat of iron is
The mass of iron is
Let the difference in temperature be
Therefore,