P. 4630. A sack of sand is lying on a light carpet on a horizontal surface. With the help of the carpet the sack of mass \(\displaystyle M\) is to be pulled from a smooth surface to a rough one. How much work is done if the coefficients of kinetic friction between the surfaces and the carpet are: \(\displaystyle \mu_1\), and \(\displaystyle \mu_2\)? The weight of the sack is not uniform, but we know that the centre of mass of the sack is at a distance of \(\displaystyle s_1\), and \(\displaystyle s_2\) from the ends of the bag.
Deadline expired on 12 May 2014.