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Basic Temperature Problem

  1. Feb 29, 2008 #1
    A 758 kg car moving at 25 m/s brakes to a
    stop. The brakes contain about 16 kg of iron
    that absorb the energy.
    What is increase in temperature of the
    brakes? Assume the specific heat of iron is
    450 J=kg ¢
    ± C. Answer in units of ±C.


    Ok I have the mass of the brakes and the specific heat and I know you only have to solve for the change in temperature, so I all need is Q.
    I know Q is measured in Joules and J=Newton x distance, but all I am given is the velocity of the car, nothing about time, distance, or Acceleration. So how do you figure the Q?
  2. jcsd
  3. Feb 29, 2008 #2


    User Avatar

    It comes to a stop so all the initial kinetic energy (1/2 mv^2) goes into heat. That's your Q
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