dear guys, i am very depressed since i cannot do these problems....please help me with them.. 1)a solid cylinder of mass 20kg and radius 0.12m rotating with initial angular speed of 125ms-2 is placed lightly(ie without any translational push) on a horizontal table with co-efficient of kinectic energy of mu=0.15, between the cylinder and the table. a)after how long does the cylinder start rolling? b) what is the intial translational energy, rotational energy and the total energy of cylinder. 2)a cylinder of mass 10kg and radius 15cm is rolling perfectly on a plane of inclination 30degress. the coeffeicient of static friction is mu=0.25. a)how much is the force of friction acting on the cylinder.