In fig. the man and the platform together weight 950N. The pulley can be treated as frictionless. Determine how hard the man has to pull on the rope to lift himself upward above the ground with constant velocity. If the weight of man is 550 N, what is the normal reaction between them?

A man of mass M stands on a.box of mass m as shown in the Fig. 2E. l (a). A rope attached to 'the box and passing over an overhead pulley allows the man to raise himself and the box by , pulling the rope downward. (i) With what minimum force should the ' man pull the rope so as to prevent himself , from falling down. (ii) If the man pulls the rope with a force F greater than the minimum force, then determine the acceleration of the (man + box) system. (iii) Determine. the normal reaction between the man and the trolley.

A man with mass 85 kg stands on a platform with mass 25 kg. He pulls on the free end of a rope that runs over a pulley on the ceiling and has its other end fastened to the platform. The mass of the rope and the mass of the pulley can be neglected, and the pulley is frictionless. With what force does he have to pull so that he and the platform have an upward acceleration of 2.2m/s^(2) . (Take g= 10m/s^(2) )

A uniform ladder 5.0 m long rests against a frictionless, vertical wall with its lower end 3.0m to from the wall. The ladder weighs 160 N . The coefficient of static friction between the foot of the ladder and the ground is 0.40 . A man weighing 740 N climbs slowly up the ladder. What is the actual frictional force when the man has climbed 1.0 m along the ladder?

A uniform ladder 5.0 m long rests against a frictionless, vertical wall with its lower end 3.0m to from the wall. The ladder weighs 160 N . The coefficient of static friction between the foot of the ladder and the ground is 0.40 . A man weighing 740 N climbs slowly up the ladder. What is the actual frictional force when the man has climbed 1.0 m along the ladder?

The weight of a man in a lift moving upwards with an acceleration ‘a’ is 600N, when the lift moves downward with the same acceleration his weight is found to be 360 N. What is the real weight of man?

A 50 kg man is standing at the centre of a 30 kg platform A. Length of the platform is 10 m and coefficient of friction between the platform and the horizontal ground is 0.2. Man is holding one end of a light rope which is connected to a 50 kg box B. The coefficient of friction between the box and the ground is 0.5. The man pulls the rope so as to slowly move the box and ensuring that he himself does not move relative to the ground. If the shoes of the man does not slip on the platform, calculate how much time it will take for the man to fall off the platform. Assume that rope remains horizontal, and coefficient of friction between shoes and the platform is 0.6.

Blocks A, B and C are placed as shown in Fig and connected by the rops of negligible mass . Both A and B weigh 25.0 N each , and the coefficient of kinetic friction between each and the surface is 0.35 blocks C descends with constant velocity . a. Draw two separate free- body diagrams showing the forces acting on A and B b. Find the tension in the rope connecting blocks A and B c. What is the weight of blocks C? d. If the rope connecting A and B were cut, what would be the acceleration of C?

Blocks A, B and C are placed as shown in Fig and connected by the rops of negligible mass . Both A and B weigh 25.0 N each , and the coefficient of kinetic friction between each and the surface is 0.35 blocks C descends with constant velocity . a. Draw two separate free- body diagrams showing the forces acting on A and B b. Find the tension in the rope connecting blocks A and B c. What is the weight of blocks C? d. If the rope connecting A and B were cut, what would be the acceleration of C?

A circus wishes to develop a new clown act. Fig. (1) shows a diagram of the proposed setup. A clown will be shot out of a cannot with velocity v_(0) at a trajectory that makes an angle theta=45^(@) with the ground. At this angile, the clown will travell a maximum horizontal distance. The cannot will accelerate the clown by applying a constant force of 10, 000N over a very short time of 0.24s . The height above the ground at which the clown begins his trajectory is 10m . A large hoop is to be suspended from the celling by a massless cable at just the right place so that the clown will be able to dive through it when he reaches a maximum height above the ground. After passing through the hoop he will then continue on his trajectory until arriving at the safety net. Fig (2) shows a graph of the vertical component of the clown's velocity as a function of time between the cannon and the hoop. Since the velocity depends on the mass of the particular clown performing the act, the graph shows data for serveral different masses. If a clown holds on to hoop instead of passing through it, what is the position of the cable so that he doesn't hit his head on the ceiling as he swings upward?