# img081 - 21 11321 Given the three masses as shown in the...

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Unformatted text preview: 21 11321 Given the three masses as shown in the diagram, if the coefﬁcient of kinetic friction between the mass m2 = 6.00 kg and the table is u = 0.200, what would be the magnitude of the upward acceleration of the mass m3 = 1.00 kg? Mass mJ,-_-__5.00_kg. The mass and friction of the cords and pulleys are small enough to produce a negligible effect on the system. (1) 9.80 m/s2 @ 2.20 m/s.2 (3) 0.400 m/s2 (4) 1.09 m/s2 (5) 0.151 m/s2 A rowboat crosses a river with a velocity of 3.34 mi/h at an angle 62.5° north of west relative to the water. The river is 0.880 mi wide and carries an eastward current of 1.25 mi/ h. How far upstream from the starting point is the boat when it reaches the opposite shore? (1 mile = 5280 ft.) (1) 660 a (2) 374 ft (3) 291 ft .880 ft (5) 458 ft A 2.7 m long pendulum is released from rest when the support string is at an angle of 29° with the vertical. What is the speed of the bob at the bottom of the swing? (1) 3.2 m/s (2) 10. m/s @2.6 m/s (4) 1.0 m/s (5) 0.27 m/s A block of mass 5.0 kg slides down a frictionless inclined plane of length 1.0 m which makes a 30 degree angle with the horizontal. If the block starts from rest, how long does it take for the block to reach the bottom of the inclined plane? Neglect the size of the block itself. (1) 0.78 s (2) 0.90 s @064 s (4) 1.1 s (5) 0.45 s A 60.0—kilogram physics student would weigh 1560 newtons on the surface of planet X. What is the magnitude of the acceleration due to gravity on the surface of planet X? (1) 0.038 m/s2 (2) 9.80 m/s2 (3) 6.10 m/s2 .260 m/s2 (5) 4.90 m/s2 Runner A is initially 4.0 mi west of a ﬂagpole and is running with a constant velocity of 4.0 mi/ h due east. Runner B is initially 10.0 mi east of the ﬂagpole and is running with a constant velocity of 3.0 mi/h due west. How far are the runners from the ﬂagpole when they meet? (1) 1.0 mile (2) 0.0 miles @410 miles (4) 2.0 miles (5) 0.50 miles By throwing a ball at an angle of 50°, a girl can throw it a maximum horizontal distance of R = 35 m on a level ﬁeld. How far can she throw the same ball vertically upward? Assume that her muscles give the ball the same speed in each case. (1) 23 m @ 18 m (3) 5.0 m (4) 4s m (5) 35 m ...
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