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P. 4566. A model car of mass m=12 kg travels on a horizontal rough surface along a circular path of radius R=5 m. It starts from rest and for a while it has a constant tangential acceleration of a0=2 m/s2, and when its acceleration reaches the value of , then it continues its motion along the circular path at constant speed.

a) Measured from the starting instant, when will the car reach the point at which it started?

b) What is the maximum of the static frictional force?

(5 points)

Deadline expired on 11 November 2013.

Google Translation (Sorry, the solution is published in Hungarian only.)

Megoldásvázlat. $\displaystyle a)$ 8,6 s.

$\displaystyle b)$ 48 N.

Statistics on problem P. 4566.
 144 students sent a solution. 5 points: 55 students. 4 points: 10 students. 3 points: 49 students. 2 points: 15 students. 1 point: 8 students. 0 point: 4 students. Unfair, not evaluated: 3 solutions.

• Problems in Physics of KöMaL, October 2013

•  Támogatóink: Morgan Stanley