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Unformatted text preview: huynh (hph268) Exam 2 practice clark (56485) 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Two forces are applied to a 50-kg box. One is 60.0 N to the south and the other is 80.0 N to the east. These are the only forces acting on the box. The magnitude of the acceleration of the box is: 1. 10 m/s 2 2. 1.5 m/s 2 3. 5.2 m/s 2 4. 0.50 m/s 2 5. 2.0 m/s 2 002 (part 1 of 2) 10.0 points The following 2 questions refer to a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Indicate the force acting on the coin for each of the cases described below. The coin is moving upward after it is re- leased. 1. The force is zero . 2. The force is down and constant . 3. The force is up and constant . 4. The force is up and increasing . 5. The force is up and decreasing . 6. The force is down and increasing . 7. The force is down and decreasing . 003 (part 2 of 2) 10.0 points The coin is at its highest point. 1. The force is down and decreasing . 2. The force is up and increasing . 3. The force is down and increasing . 4. The force is down and constant . 5. The force is zero . 6. The force is up and constant . 7. The force is up and decreasing . 004 10.0 points A ball of mass 10 kg and a ball of mass 1000 kg are floating in empty space, connected by a spring of negligible mass and force constant k = 10000 N/m. At a certain instant, the spring has been stretched a distance such that the force it exerts on the 10 kg ball is 100 N. What force does the spring exert on the 1000 kg ball? 1. Impossible to say from the information given. 2. 1000 N 3. No force at all, since it is too massive to accelerate relative to the 10 kg ball. 4. 1.0 N 5. 100.0 N 6. 10.0 N 7. 10000 N 005 10.0 points A man stands in an elevator in the universitys administration building and is accelerating upwards. (During peak hours, this does not happen very often.) huynh (hph268) Exam 2 practice clark (56485) 2 Elevator Cable Choose the correct free body diagram for the man, where F i,j is the force on the object i , from the object j . 1. F F elevator, cable man, earth 2. F man, floor F elevator, cable F man, earth 3. F man, acceleration 4. F man, cable 5. F F man, floor man, earth 6. F elevator, cable F man, elevator 006 10.0 points Given: The initial position of the block is the origin; i.e. , x = 0 at t = 0 . Consider up the track to be the positive x-direction. A block with an initial velocity v slides up and back down a frictionless incline. v Which graph best represents a description the position of the block versus time?...
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This note was uploaded on 09/28/2011 for the course PH 303K taught by Professor Zao during the Spring '11 term at University of Texas at Austin.
- Spring '11