2053_Fall10_Exam2

# 2053_Fall10_Exam2 - 77777 77777 Instructor(s Mueller/Qiu...

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77777 77777 1. An angular speed of 1 rad/s corresponds to about: (1) 9.55 rev/min (2) 60 rev/min (3) 30 rev/min (4) 19.1 rev/min (5) 0.159 rev/min 2. A disk rotates about its central axis starting from rest at t = 0 and accelerates with constant angular acceleration. At one time it is rotating at 4 rev/s; 60 revolutions later, its angular speed is 16 rev/s. Starting at t = 0, what is the time required to complete 64 revolutions? (1) 8 s (2) 16 s (3) 4 s (4) 32 s (5) 24 s 3. An astronaut is being tested in a centrifuge. The centrifuge has a radius R and, in starting from rest at t = 0, rotates according to θ ( t ) = (0 . 5 rad/s 2 ) t 2 . At what time t > 0 is the magnitude of the tangential acceleration equal to the magnitude of the radial acceleration ( i.e., centripetal acceleration)? (1)
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## This note was uploaded on 12/15/2011 for the course PHY 2053 taught by Professor Buchler during the Fall '06 term at University of Florida.

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2053_Fall10_Exam2 - 77777 77777 Instructor(s Mueller/Qiu...

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