A block of mass 2 kg is placed on the floor. The coefficient of friction is 0.4. If a force of 2.5 is applied on the block horizontally, what will be the state of block. Give reason.

A block of mass 15 kg is placed on a long trolley. The coefficient of static friction between the block and the trolley is 0.18. The trolley accelerates from rest with 0.5 m s-^2 for 20 s and then moves with uniform velocity. Discuss the motion of the block as viewed by (a) a stationary observer on the ground, (b) an observer moving with the trolley.

A block of mass 0.1 kg is held against a wall by applying a horizontal force of 5N on the block. If the coefficient of friction between the block and the wall is 0.5, what is the magnitude of the frictional force acting on the block?

A force of 1000 Newton is applied on a 25 kg mass for 5 seconds. What would be its velocity?

A uniform rope of length 12 m amd mass 6 kg hangs vertically from a rigid support.A block of mass 2 kg is attached to the free end of the rope.A transverse pulse of wave length 0.06m is produced at the lower end of the rope.What is the wavelength of the pulse when it reaches the top of the rope?

A-stone of mass 0.25 kg tied to the end of a string is whirled round in a circle of radius 1.5 m with a speed of 40 rev./min in a horizontal plane. What is the tension in the string? What is the maximum speed with which the stone can be whirled around if the string can withstand a maximum tension of 200. N?

A body of mass 2kg is lying on a rough inclined plane of inclination 30^@ . Find the magnitude of the force needed to make the block move down the incline.

A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in Fig. 5.19. What is the action on the floor by the man in the two cases? If the floor yields to a normal force of 700 N, which mode should the man adopt to lift the block without the floor yielding?

A block of 1.2 kg moving at 20 cm/s collides head-on with a simmilar block kept rest.The co-efficient of restitution is 3/5 .Find the loss of K.E during the collision.

Figure 5.18 shows a man standing stationary with respect to a horizontal conveyor belt that is accelerating with 1 m s^2 . What is the net force on the man? If the coefficient of static friction between the man’s shoes and the belt is 0.2, up to what acceleration of the belt can the man continue to be stationary relative to the belt? (Mass of the man = 65 kg.)

A body of mass 2kg is lying on a rough inclined plane of inclination 30^@ . Find the magnitude of the force needed to make the block move up the incline. Coefficient of static friction is 0.2