# Homework Help: Centre of rotation

1. Dec 4, 2011

### sparkle123

"A car is driving on a circular racetrack, which is inclined at an angle of 40 degrees to the horizontal. The centre of rotation for the track lies in the horizontal plane, and is 45 m from the centre fo the racetrack and 5.0 m above ground level. The car's tires have a coefficient of kinetic friction of 0.35. The car is driving at the maximum possible speed to stay in its position on the narrow track. All of a sudden, the car hits an oil slick and the coefficient of friction is reduced to 0. Where, relative to the centre of the track, does the car crash into the ground?"

I need help visualizing this problem. Where exactly is this "centre of rotation for the track"?
Thank you! :)

2. Dec 4, 2011

### I like Serena

Hi sparkle123!

It should say:
"The centre of rotation for the track lies in the horizontal plane, and is 45 m from the car and 5.0 m above ground level."

3. Dec 4, 2011

### sparkle123

Thanks I like Serena! :)

so centre of rotation for the track = centre of track?

4. Dec 4, 2011

Yep! :)

5. Dec 4, 2011

Thanks! :)