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# Whichsketchofweightshownon thescalevstime

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Unformatted text preview: ) (b) (c) (d) t (b 1. 2. 3. 4. t ) ( a) T (a T A student steps onto a bathroom scale in a stationary elevator on the first floor of the Acme Building. The elevator accelerates until it reaches the second floor and then continues at constant speed until the 5th floor, where it starts slowing and stops on the 6th floor. Which sketch of weight shown on the scale vs. time during the entire process is most likely to be correct? W (d) 0 of 30 of 30 0% 0% 0% ) 0% (d 40 (c) ) (a) (b) (c) (d) t (c 1. 2. 3. 4. (b) t ) (a) t (b t W ) W (a W Let’s get numerical! In the previous problem, the elevator accelerated uniformly between the 1st and 2nd floors, and decelerated uniformly between the 5th and 6th floors. In between, the elevator covered the 6 meter distance between floors in 1 sec. The student weighed 800 N. What was the minimum scale reading during the trip? (Use g = 10 M/s2) 0 of 30 N 0% 0 24 0 64 0 N 0 0% N 0% 38 42 0 N 0% N 0% N 0% 56 40 0 800 N 420 N 560 N 380 N 640 N 240 N 80 1. 2. 3. 4. 5. 6. A block sits at rest on a frictionless surface. Which of the following sketches most closely resembles the correct freebody diagram for all forces acting on the block? Each red arrow represents a force. Observe their number and direction, but ignore their lengths. 40 A B C D A B C D None of them. 0 of 30 0% ft he m . 0% D 0% C 0% B 0% A 1. 2. 3. 4. 5. Now, the same block moves with a constant velocity to the right on the frictionless surface. Which of the following most closely resembles the correct freebody diagram for all forces acting on the block? 40 A B C D A B C D None of the above 0 of 30 e 0% bo v 0% D 0% C 0% B 0% A 1. 2. 3. 4. 5. Now, the block moves with a constant velocity to the right on a surface that has friction. Which of the following most closely resembles the correct freebody diagram for all forces acting on the block? Can you attach names to these forces? 40 A B C D A B C D None of the above 0 of 30 e 0% bo v 0% D 0% C 0% B 0% A 1. 2. 3. 4. 5. A battleship simultaneously fires two shells at enemy ships. If the shells follow the parabolic trajectories shown, which ship gets hit first? 40 A Battleship B 25% 25% 25% 25% 1. 2. 3. 4. A. Both are hit simultaneou...
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## This note was uploaded on 01/20/2014 for the course PHYSICS 131H taught by Professor Ralf during the Fall '10 term at Ohio State.

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