Note: for an object on a circular path, a force is requied to keep it on that pa

Question

Note: for an object on a circular path, a force is requied to keep it on that path. in some cases auch as this expeiment, that force is the tension in a string. however, the force doesn't always have to be tension.

1) A racecar driver speeds around on a circular track of radius 100m at a velocity of 50 km/hr. The coefficient of friction Us between his tires and the road is 0.20. It begins to rain, reducing Us to 0.15. What must he change his velocity to in order to maintain his path without skidding off of the track? (use units of km/hr)

Explanation / Answer

mv^2/r=umg

or v=12.124 m/s

=43.647 km/hr

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