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# problem_pdf - douglass(hmd377 – practice-test-2 –...

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Unformatted text preview: douglass (hmd377) – practice-test-2 – swinney – (56425) 1 This print-out should have 26 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A small mass is released from rest at a very great distance from a larger stationary mass. Which of the following graphs best repre- sents the gravitational potential energy U of the system of masses as a function of t ? 1. t U 2. t U 3. t U 4. t U 5. None of these graphs is correct. 6. t U 7. t U 002 10.0 points A 108 g mass is attached to the end of an unstressed vertical spring (of constant 39 . 6 N / m) and then dropped. The acceleration of gravity is 9 . 8 m / s 2 . What is its maximum speed? Answer in units of m / s. 003 10.0 points A curve of radius r is banked at angle θ so that a car traveling with uniform speed v can round the curve without relying on friction to keep it from slipping to its left or right. The acceleration of gravity is 9 . 8 m / s 2 . m μ ≈ θ Find the component of the net force on the car parallel to the incline summationdisplay vector F bardbl . 1. F = mv 2 r sin 2 θ cos 2 θ 2. F = mv 2 r sin 2 θ cos θ 3. F = mv 2 r cos θ 4. F = mv 2 r tan θ 5. F = mv 2 r sin θ 6. F = mv 2 r sin θ 7. F = mv 2 r cos θ 8. F = mv 2 r sin θ cos θ 9. F = mv 2 r cot θ 10. F = mv 2 r tan θ 004 10.0 points In a certain region of space, a particle expe- riences a potential energy U ( x ) = A x 2 + B , douglass (hmd377) – practice-test-2 – swinney – (56425) 2 where A and B are constants. What force F gives rise to this potential energy? 1. There is no force, since the slope of the line is the constant B A . 2. ˆ i parenleftbigg A x parenrightbigg 3. ˆ i parenleftbigg 2 A x 3 parenrightbigg 4.- ˆ i parenleftbigg A x 2 parenrightbigg 5.- ˆ i parenleftbigg A x parenrightbigg 6. ˆ i parenleftbigg A x + B x parenrightbigg 7. ˆ i parenleftbigg A x 2 parenrightbigg 8.- ˆ i parenleftbigg 2 A x 3 parenrightbigg 9.- ˆ i parenleftbigg A x + B x parenrightbigg 005 10.0 points R Consider a satellite moving near the Earth surface, the radius of its orbit r is approxi- mately the radius of the Earth R . The period T of the satellite is 1. T = 2 π radicalBigg R g 2. T = 2 π radicalbigg g R 3. T = radicalbigg g R 4. T = radicalBigg R g 006 10.0 points A particle on a string is whirled in a circle at a constant speed, in the absence of a gravita- tional field. A top view of the circular motion at one instant is b v Choose the diagram showing the compo- nents of the acceleration vector at that in- stant. 1. b 2. b 3. b 4. b 5. b 6. b 7. b 8. b 9. b 007 (part 1 of 2) 10.0 points Given two masses, m 1 and m 2 , m 1 is moving to the right with a velocity v 1 , while m 2 is suspended by a string of length L and is ini- tially at rest. Mass m 1 collides with mass m 2 , douglass (hmd377) – practice-test-2 – swinney – (56425) 3 and the two masses are stuck together as a re-...
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## This note was uploaded on 10/25/2010 for the course PHY 301 taught by Professor Swinney during the Spring '07 term at University of Texas.

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problem_pdf - douglass(hmd377 – practice-test-2 –...

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