Q4 (a) 600 (c) 1500 oetween tne two forces is (b) 1200 (d) 900 4. A weightless ladder, 20 ft long, rests against a fric- tionless wall at an angle of 600 with the horizontal. A 150-pound man is 4 ft from the top of the ladder. A horizontal force is needed to prevent it from slipping. Choose the correct magnitude: (a) 175 1b (c) 701b (b) 1001b (d) 1501b 5. A mass M is suspended by a rope from a rigid suppo is tied

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