P112P2F06 - 1 Physics 112 Prelim II Fall 2006 Multiple...

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1 Physics 112 Prelim II Fall 2006 Multiple Choice Questions (20 points total). Please circle the letter corresponding to the correct answer. 1. [5 points] A car of mass M accelerates from an initial speed v i to a final speed v f on a level straight road during a time Δ T. Air drag is negligible. The average power supplied by the engine is (A) M ( v f 2 – v i 2 ) / (2 T ) (B) M (v f – v i ) 2 / (2 T ) (C) M (v f + v i ) 2 / (4 T ) (D) M (v f – v i ) v f / ( T ) 2. [5 points] A rocket is moving with an initial speed of 700 m/s in outer space. Half of its mass is fuel. If the ejection speed is 2000 m/s relative to the rocket, by what factor will the rocket speed increase if it burns up all of the fuel? (A) by a factor of 2 (B) by a factor of 3 (C) by a factor of 4.6
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2 Your Name ______________________________________________ 3. [5 points] A pendulum, consisting of a bob of mass m and a massless string of length L, swings through an angle of 60 degrees from its highest point to its lowest point. The work done on the pendulum bob by the string in the process is (A) mgL /2 (B) 0.866 mgL (C) mgL π /3 (D) Zero 4. [5 points] A wheel is subjected to uniform angular acceleration about its axis. Initially its angular velocity is zero. In the first 3 seconds, it rotates through an angle θ 1 ; in the next 3 seconds, it rotates through an additional angle 2 . The ratio 2 / 1 is (A) 1 (B) 2 (C) 3 (D) 4
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Your Name ______________________________________________ 5. [22 points] The velocity v y of a bouncing ball of mass m = 0.40 kg is shown in the top graph as a function of time. A ”bounce” is defined as the ball making contact with the ground. v y is positive when the ball moves upward. (Continued on the next page.)
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P112P2F06 - 1 Physics 112 Prelim II Fall 2006 Multiple...

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