1. A uniform beam 3 meters long weighs 100 N. Loads of 50 N and 150 N are placed on the beam at points which are % m and 2 % m, respectively, from its left end. If the beam is kept in horizontal position by supports at the two ends, find these reactions 50 N 150 N 14 m 1% m 100 N 3m 2. A 7-m uniform ladder weighing 80 N leans against a vertical frictionless wall making an angle of 370 with the wall as shown. A man weighing 480 N climbs up the ladder and stays 1.5 m from its upper end. Find (a) the force exerted by the wall against the ladder and (b) the force exerted by the floor on the lower end of the ladder $2 F1 7 m 370 430 N F2