Posted by **Francesca** on Friday, May 20, 2011 at 10:22am.

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 -
**drwls**, Friday, May 20, 2011 at 11:03am
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)

## Answer This Question

## Related Questions

- Physics - Two coupled boxcars are rolling along at 4.0 when they collide with ...
- Physics - An automobile is brought to a stop by applying friction brakes to the ...
- Science - How are temperature and thermal energy related A) Temperature and ...
- science - please help me im stuck on this last one !! .A car driver accelerates ...
- science (check new answer) - please check my answser .A car driver accelerates ...
- physics - what is thermal equilibrim, and what is thermal energy? what are fluid...
- chem please help drbob222 - Two objects A and B have the same mass and the same ...
- physics - Two railroad cars, each of mass 6500kg and traveling 95km/h, collide ...
- Physics - Two railroad cars, each of mass 7350 kg and traveling 80 km/h in ...
- PHYSICS - Two railroad cars, each of mass 7600KG and traveling 85KM/H in ...

More Related Questions