Final_Exam_Sol

# Final_Exam_Sol - PFTYS Spring2010 180 FinalExaminationMay...

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PFTYS 180 Spring2010 Final Examination May 3,2010 Name Total score /2A0 For problems marked OSE, using Official Starting Equations for fullcredit. MULTIPLE CHOICE SECTION: answer on Scantron sheet (1) (4 points) What do you think about starting off an exam with a very easy question? (A) I think it's great! (B) I'm philosophically opposed to it; all points must be earned (C) I'll take the points any way I can get them. (D) An easy question can put me offmy guard (E) What? (Any answers count as correct). (2) (12 points) You can exert a force on a block of mass M in one of two ways: you can exert EITHER a force of 2000 N acting for a time of 0.01 s, OR a force of 200 N acting for a time of 0.1 s. These two alternatives would produce. .. (A) the same acceleration of the block (while the force is operating) (B) the same rate of change of momentum of the block (while the force is o the same change in momentum momenfum afterwards minus momenfum (D) the same rate of change in kinetic energ/ of the block (while the force is operating) (E) none of the above. (3) (12 points) A rock is dropped from rest and accelerates downward with acceleration whose magnitude is g : l0 m/s2. Now suppose that instead of being dropped from rest, the rock is thrown downward with initial speed 10 m/s . Immediately aft"Llh9]g*M&ft your hand, what is the magnitude of the acceleration? (lrleglect air resistance)((A) g : 10 m/[email protected]) about 2A m/s2 (C) less than g (D) more than g but less than 20 m/s2 (E) zero (4) (I2 points) A man starts to push on a crate on a rough floor. The crate is initially at rest, but starts

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Final_Exam_Sol - PFTYS Spring2010 180 FinalExaminationMay...

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