Case 1: A DJ starts up her phonograph player. The turntable accelerates uniformly from rest, and takes t1 = 10.8 seconds to get up to its full speed of f1 = 78 revolutions per minute. Case 2: The DJ then changes the speed of the turntable from f1 = 78 to f2 = 120 revolutions per minute. She notices that the turntable rotates exactly n2= 19 times while accelerating uniformly. Randomized Variables t1 = 10.8 seconds n2 = 19 times a)Calculate the magnitude of the angular acceleration of the turntable in Case 1, in radians/second2. α1 = b)Calculate the magnitude of the angular acceleration of the turntable (in radians/second2) while increasing to 120 RPM (Case 2). α2 = c) How long (in seconds) does it take for the turntable to go from f1 = 78 to f2 = 120 RPM? t2 =
Case 1: A DJ starts up her phonograph player. The turntable accelerates uniformly from rest, and takes t1 = 10.8 seconds to get up to its full speed of f1 = 78 revolutions per minute.
Case 2: The DJ then changes the speed of the turntable from f1 = 78 to f2 = 120 revolutions per minute. She notices that the turntable rotates exactly n2= 19 times while accelerating uniformly.
Randomized Variables
t1 = 10.8 seconds
n2 = 19 times
a)Calculate the magnitude of the
α1 =
b)Calculate the magnitude of the angular acceleration of the turntable (in radians/second2) while increasing to 120 RPM (Case 2).
α2 =
c) How long (in seconds) does it take for the turntable to go from f1 = 78 to f2 = 120 RPM?
t2 =
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