extra credit 01
2 Pages

extra credit 01

Course Number: PHY 303K 56910, Spring 2012

College/University: University of Texas

Word Count: 526

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hoe (wh4655) extrac redit01 T urner (58220) This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page nd all choices before answering. 16 001 10.0 points When an object falls through air, there is a drag force with dimension M L/T2 that depends on the product of the surface area of the object and the square of its velocity; i.e., 1 cm 4 cm , radius What...

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(wh4655) hoe extrac redit01 T urner (58220) This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page nd all choices before answering. 16 001 10.0 points When an object falls through air, there is a drag force with dimension M L/T2 that depends on the product of the surface area of the object and the square of its velocity; i.e., 1 cm 4 cm , radius What length of the lighter-density part of the bar is needed if the total mass is 4375 g? Answer in units of cm. where C is a constant. What is the dimension for constant C ? 1. [C ] = 2. [C ] = 3. [C ] = 4. [C ] = 5. [C ] = 6. [C ] = 7. [C ] = 8. [C ] = 9. [C ] = 10. [C ] = M T L2 T L2 M TL M M L3 M L2 T2 L2 M M 2 L2 T T2 L M M T T M 002 10.0 points A cylinder, 16 cm long and 4 cm in radius, is made of two dierent metals bonded end-toend to make a single bar. The densities are 4.6 g/cm3 and 6 g/cm3 . 003 10.0 points When Maggie applies the brakes of her car, the car slows uniformly from 15.1 m/s to 0 m/s in 2.39 s. How far ahead of a stop sign must she apply her brakes in order to stop at the sign? Answer in units of m. 004 10.0 points Consider the plot describing motion along a straight line with an initial position of 10 m. 9 8 7 6 velocity (m/s) Fair = C A v 2 , 5 4 3 2 1 0 1 2 3 4 1 2 3 4567 time (s) What is the position at 9 seconds? Answer in units of m. 8 9 hoe (wh4655) extrac redit01 T urner (58220) Answer units in of m/s. 005 10.0 points A car capable of a constant acceleration of 4.35 m/s2 is stopped at a trac light. When the light turns green, the car starts from rest with this acceleration. At the very same moment, a truck traveling with constant velocity 16.1 m/s passes the car. As the cars velocity increases, it will eventually move faster than the truck and later overtake it. How far from the light will the car catch up with the truck? Answer in units of m. 006 10.0 points The vectors A and B are given by A = 1.23 + 4.03 i j B = 1.01 + 1.24 i j Find the angle between A and B . Answer in units of . 007 10.0 points A particle moving at a velocity of 8.6 m/s in the positive x direction is given an acceleration of 0.2 m/s2 in the positive y direction for 5 s. What is the nal speed of the particle? Answer in units of m/s. 008 10.0 points A boat moves through the water of a river at 4.72 m/s relative to the water, regardless of the boats direction. If the current is owing at 3.86 m/s, how long does it take the boat to complete a trip consisting of a 297 m displacement downstream followed by a 389 m displacement upstream? Answer in units of s. 009 10.0 points A cat chases a mouse across a 1.6 m high table. The mouse steps out of the way, and the cat slides o the table and strikes the oor 2.4 m from the edge of the table. The acceleration of gravity is 9.81 m/s2 . What was the cats speed when it slid o the table? 2
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