# Physics

posted by
**Jim**
.

Another problem I need help with.

An auto race is held on a circular track. A car completes one lap in a time of 20.1 s, with an average tangential speed of 43.1 m/s. Find the following.

The following did not follow.

I apologize for that. Here is the entire question.

An auto race is held on a circular track. A car completes one lap in a time of 20.1 s, with an average tangential speed of 43.1 m/s. Find the following.

(a) the average angular speed in rad/s

(b) the radius of the track in m

a) Divide 2 pi radians (one lap) by 20.1 seconds. The answer will be in radians per second.

b) 43.1 m/s = (circumference)/20.1 s

= 2 pi R /(20.1 s)

R = (43.1 m/s)*20.1 s/(2 pi)= ? m