1.A 40N block is supported by two ropes. One rope is horizontal and the other makes an angle of 30 degree with the ceiling. The tension in the rope attached to the ceiling is approximately:

2.Choose the correct option or options.

3.A bicycle is in motion. When it is not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts:

4.A heavy uniform chain lies on a horizontal table top. If the coefficient of friction between the chain and the table is 0.25, then the maximum percentage of the length of the chain that can hang over one edge of the table is

5.A block of mass 4 kg rests on an inclined plane. The inclination of the plane is gradually increased. It is found that when the inclination is 3 in 5, the block just begin to slide down the plane. The coefficient of friction between the block and the plane is