Practice Final Exam - Phys 116 Final Exam May 15,2001 L(5...

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,. Phys. 116 Final Exam May 15,2001 L (5 points) In the situation shown below, a person pulls a suing attached to block A, which is in turn attached to another, heavier block B via a second suing The blocks are accelerated together with a non-zero acceleration. How does the force of suing I on block A compare with the force of suing 2 on block B? Explain your answer. string 2 string 1 F CiJ (5 points) Imagine that a rigid cylinder 0.01 m in diameter and I m long is spinning with an angular momentum La. About which rotation axis A or B (both of which run through the center of mass) would the kinetic energy be greater? Explain. B ~ ;kWp. .. /'") o (5 points) Compare a ball initially at rest which rolls down an inclined plane without slitming, to a block without friction sliding down the same inclined plane. The ball and the block have the same mass m, lithe ball and the block travel the same vertical distance, which arrives at the bottom with a greater velocity? (Or do they have the same velocity?) Why?
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-: ( 1 m 4.. (5 points) There are two groups of clocks in reference frames K and K', and the clocks in frame K' are moving relativistically relative to frame K with a velocity v as shown in the figure. Measured with respect to the rest frame of any clock, all the other clocks in the same reference frame are synchronized. The moment when the clock A' gets opposite the clock A is taken for tJre JJeginning of the time count Draw the approximate relative positions of the hands on all the clocks at this moment, accor.ding-tcr--_·· observers at rest in the reference frame K' _ ...... ~"" ( ." . (\.:!~I) l.- . '. I 'C' V'I() " I' v ' PC ~ K' ((~~=-_~_ -1; - ~// -+-""'9---{-''-t--+-'l'--+----~-f-·H ~ 0 ::: d' ((}-:"O ) 't. ~ -;0 0) t' ::::0 CB C)~ C9 K 1-' ~ '((O-2~ ) t tY,-" .L"D <, • " "'If) .. ,,- --- 5. (5 points) The nucleus ofthe carbon nucleus C J2 consists of six protons (HI) and six neutrons (n) held in close association by strong nuclear forces The rest masses of C
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