PROBLEM:(adsbygoogle = window.adsbygoogle || []).push({});

A train with a total mass 2.20E+6kg rises 600m as it travels a distance of 53.0km along a steady slope at a constant speed of 10.0km/hr. The frictional force on the train is 1.400 percent of the weight. Find the kinetic energy of the train.

I did this using K=.5*m*vsquared and got 8501240.

It then asks:

Find the energy dissipated by kinetic friction.

and

Find the power output of the train engines.

I am unsure as to how to find the energy dissipated by kinetic friction. I thought it involved using fk = muk * N

where Mu is the coefficient of friction and N is the normal force. Yet, I could not seem to find the answer.

For the power I tried using P= .5 m Vsquared / t. And finding t from the information given but this also did not work.

Thanks for helping!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: A train: Power and friction

**Physics Forums | Science Articles, Homework Help, Discussion**