Thermal Physics

posted by .

Two cars collide head on while each is travelling at 80 km/hr. Suppose all of their
kinetic energy is transformed into thermal energy. What is the temperature increase
of each car? [You may assume that the specific heat capacity of each car is that of
iron, 449 J kg-1K-1.]

• Thermal Physics -

Divide the initial total kinetic energy (M V^2) by the heat capacity (2*M*C). M is the mass per car.

To compute total KE in Joules, note than you must first convert 80 km/h to 22.22 m/s. You must include a factor of 2 because there are two cars

Leave the mass as an unknown factor, M. It will cancel out

Then
delta T = V^2/(2 C)
where C is the specific heat

I get a T rise of 0.55 C (or K)

Similar Questions

1. physics

what is thermal equilibrim, and what is thermal energy?
2. Chemistry

1. A bottle of juice at room temperature is placed in a bucket of ice inside a box. The box, bottle, and bucket of ice represent a closed system. Which of the following statements is true?
3. Physics

Two coupled boxcars are rolling along at 4.0 when they collide with and couple to a third, stationary boxcar. 1.) What is the final speed of the three coupled boxcars?
4. Physics

An automobile is brought to a stop by applying friction brakes to the wheels. The brakes get hot; their thermal energy is increased. The decrease in kinetic of the car is equal to the increase in thermal energy of the brakes. According …
5. science

please help me im stuck on this last one !! .A car driver accelerates to a speed of 35 mph and then takes her foot of the gas pedal.Even though she does not press the brake pedal at any time,she eventually rolls to a stop.which of …

please check my answser .A car driver accelerates to a speed of 35 mph and then takes her foot of the gas pedal.Even though she does not press the brake pedal at any time,she eventually rolls to a stop.which of the following most likely …