1. Determine the values of P and E to maintain the equilibrium of the forces. 100 lb 9. Two men are just able to lift a 300 kg weight 2. Determine the resultant force. with a crowbar when the fulcrum for the lever is 0.3 m from the weight. The first man exerts his TOK strength at 0.9m while the second is at 1.5 m from the fulcrum respectively. If the men interchanged their positions, they can raise a 340 kg weight. What amount of forces do the men exert? SOKN 10. Determine the resultant force: 20 1b 10 lb 40 1b 3. A box is being pulled by a force 50 1b exerted by the rope inclined 40 with horizontal. What's the effective component of the force pulling the box? 11. Determine the centroid of the shaded portion. 4. In the system shown, a 5 kg block rests on a horizontal table top and is attached with horizontal string to a second string as shown. What is the maximum value for the mass M, if the block is to remain stationary? Assume us = 0.5 M - ? 5. A 250 kg weight rests on a 300 inclined plane. 12. Determine the Neglecting friction, how much pull must one abscissa of the centroid exert to bring the weight up the plane? for the shaded area as 6. A 56 1b mass rests on horizontal surface. The shown. force needed to move it along the surface is 25 lb . Determine the coefficient friction. 7. A homogeneous ladder 18 ft long and weighing 120 lbs rests against a smooth wall. The angle between it and the floor is 700. The coefficient of friction between the floor and the ladder is 0.25 . How far up the ladder can a 180 lb man walk before the ladder slips