PY211Midterm2_S07_Alt - Practice PY211 MIDTERM EXAM 2 G =...

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Practice PY211 MIDTERM EXAM 2 Useful Numbers: G = 6.67 x 10 -11 Nm 2 /kg 2 g = 9.8 m/s 2 R Earth = 6.38 x 10 3 km M Earth = 5.97 x 10 24 kg R Moon = 1.74 x 10 3 km M Moon = 7.35 x 10 22 kg Earth-Moon Distance = 384 x 10 3 km 1. Write your answer in the space provided (2 points each including bonus points). _____ Two objects, a spherical ball with mass M and rectangular block with mass 3M , start from rest on top of a hill. The spherical ball rolls down the hill without slipping. The rectangular block slides down the hill without friction. Which has the higher linear velocity of its center-of-mass at the bottom of the hill? A) Both have the same velocity B) The rolling ball C) The rectangular block D) Not enough information _____ Compare a ball bouncing elastically off of a wall to a piece of putty of the same mass and initial velocity hitting the wall and sticking to it. In which case is the impulse to the wall the largest? A) The putty hitting the wall B) The ball hitting the wall C) They give the same impulse to the wall D) Not enough information is given _____ A figure skater stands on one spot of the ice and spins with her arms extended. As she pulls her arms in close to her body, her angular velocity changes. Compared to having her arms extended outwards, with arms pulled in, her angular momentum : A) Remains unchanged B) Decreases C) Increases D) Equals zero E) Not enough information
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_____ I build a children’s slide to be 3 m high. I can build the slide so that it is either straight or
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This note was uploaded on 04/10/2008 for the course PY 211 taught by Professor Stone during the Spring '08 term at BU.

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PY211Midterm2_S07_Alt - Practice PY211 MIDTERM EXAM 2 G =...

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