P. 4699. Two thin sheets on the surface of a slope of angle of elevation of \(\displaystyle \alpha=30^\circ\) form a pair of rails. The distance between the sheets is \(\displaystyle d=1.6\) cm. A ball of diameter of 2 cm is placed to the rails and it rolls down without slipping.
\(\displaystyle a)\) Calculate the acceleration of the centre of the ball.
\(\displaystyle b)\) If the coefficient of friction is \(\displaystyle \mu\), at what angle of elevation will the ball slip on the rails?
Deadline expired on 10 February 2015.