Serway_CP_poll_ch06

Serway_CP_poll_ch06 - A high-diver of mass 70 kg jumps off...

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Unformatted text preview: A high-diver of mass 70 kg jumps off a board 10 meters above the water. If, 1 s after entering the water his downward motion is stopped, what average upward force did the water exert? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 100 N 2. 245 N 3. 490 N 4. 980 N A 10-gram bullet is fired into a 200-gram block of wood at rest on a horizontal surface. After impact, the block slides 8 m before coming to rest. If the coefficient of friction = 0.4, find the speed of the bullet before impact. 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 106 m/s 2. 166 m/s 3. 226 m/s 4. 286 m/s A baseball infielder, mass 75 kg, jumps up with velocity 3 m/s and catches a 0.15 kg baseball moving horizontally at 50 m/s. What is the final momentum of the system, infielder and baseball? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 225.125 kg-m/s 2. 227.91 kg-m/s 3. 230.03 kg-m/s 4. 232.5 kg-m/s A firehose directs a steady stream of 15 kg/sec of water with velocity 28 m/s against a flat plate. What force is required to hold the plate in place? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 110 N 2. 420 N 3. 1100 N 4. 4116 N Popeye, of mass 70 kg, has just downed a can of spinach. He accelerates quickly and stops Bluto, of mass 700 kg (Bluto is very dense), who is charging in at 10 m/s. What was Popeye's velocity? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 10 m/s 2. 31 m/s 3. 50 m/s 4. 100 m/s How far from the center of the Earth is the center of mass of the Earth-moon system? The moon has 1/81 the mass of the Earth and their center-to-center separation is 384,000 km. 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 4,683 km 2. 4,740 km 3. 4,800 km 4. 42,666 km A valid unit for momentum is which of the following? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. kg-m/s 2. kg-m/s 2 3. kg-m 4. N-m The dimensional equivalent of the quantity impulse in terms of the fundamental quantities (mass, length, time) is which of the following?...
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This note was uploaded on 01/19/2010 for the course PHYS 200 taught by Professor Davies during the Spring '08 term at Roger Williams.

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Serway_CP_poll_ch06 - A high-diver of mass 70 kg jumps off...

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