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33.

33. III Two packages at UPS start sliding down the 20 ramp shown in FIGURE P133. Package A has a mass of 5.0 kg and a coefcient of friction of 0.20. Package B has a mass of 10 kg and a coeffi- cient of friction of 0.15. How long does it take package A to reach the bottom? N-k - m=0.lO FIGURE P733 FIGURE P734 35. II The coefcient of static friction is 0.60 between the two blocks in FIGURE P735. The coefficient of kinetic: friction be- tween the lower block and the floor is 0.20. Force F causes both blocks to cross a distance of 5.0 m, starting from rest. What is the least amount of time in which this motion can be completed without the top block sliding on the lower block? Massleiss string 514. Massless, fric- tionless pulley FIGURE P135 FIGURE P136 37. II The 10.2 kg bloek in FIGURE P137 is held in place _by a force applied to a rope passing over two massless, frictionlegs pulleys. Find the tensions T1 to T5 and the magnitude of force F. 2.0 kg 1.0 kg FIGURE P137 FIGURE P738 39. Ill FIGURE P139 shows a block of mass m resting on a 20 slope. The block has coefficients of friction us = 0.80 and m = 0.50 with the surface. It is connected via a massless string over a massless, frictionless pulley to a hanging block of mass 2.0 kg. a. What is the minimum mass m that will stick and not slip? b. If this minimum mass is nudged ever so slightly, it will start being pulled up the incline. What acceleration will it have? 45. II A house painter uses the chair-and- pulley arrangement of FIGURE P145 to lift himself up the side of a house. The painter's mass is 7'0 kg and the Chair's mass is 10 kg. With what force must he pull down on the rope in order to acceler- ate upward at 0.20 W52? FIGURE P145