SampleTestQs298_1Sp08

# SampleTestQs298_1Sp08 - d Draw a free body diagram for...

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Sample ‘work-out’ test questions for Phys 298 exam 1. 1. Consider a particle whose position is well-described by the expression r r = ( bt 2 " ct ) ) i + (8 t " 10) ) j , where r is measured in meters and t is time in seconds, b is a constant with numerical value 2, and c is a constant with numerical value 8. a. What are the units of the constant b ? b. What is the position of the particle when it stops moving in the x - direction? c. Write the acceleration of the particle in vector form. d. Is the motion of this particle most similar to free fall, projectile motion, circular motion, or motion due to a variable force? 2. Block A, of mass M, rests on a ramp inclined at angle θ to the horizontal. Block B, of mass m, hangs from an ideal string, which is routed over an ideal pulley and connected to block A. Block A is on the verge of slipping down the ramp. a. What kind of friction is block A experiencing? b. Is the mass of block B less than, greater than, or equal to that of block A? c. Draw a free body diagram for block B.

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Unformatted text preview: d. Draw a free body diagram for block A. e. Write Newton’s second law for the forces on block B. What is the tension in the string? f. Write Newton’s second law for the forces on block A parallel to the plane. g. What is the coefficient of friction between block A and the ramp? Sample multiple choice: 3. You are driving forward when you make a turn. You notice that the fuzzy die hanging from your rear view mirror is hanging at an angle 7 degrees to the left of vertical. Which direction are you turning? a. Left b. Right c. Not really turning – the Earth turns d. Dude, I don’t even know what you’re talking about! 4. You are driving at speed v while you make a turn. You notice that the fuzzy die hanging from your rear view mirror is hanging at an angle θ with respect to the vertical. What is the radius of your turn in terms of given quantities and known constants? a. r = vt b. r = v " c. r = v 2 g tan d. r = 0...
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