Problem 3: Case 1: A DJ starts up her phonograph player. The turntable accelerates uniformly from rest, and takes t = 10.4 seconds to get up to its full speed of fj = 78 revolutions per minute. Case 2: The DJ then changes the speed of the turntable from fj = 78 to f = 120 revolutions per minute. She notices that the turntable rotates exactly n2= 18 times while accelerating uniformly. Randomized Variables t = 10.4 seconds n2 = 18 times Part (a) Calculate the angular speed described in Case 1, given as fj = 78 revolutions per minute, into units of radians/second. Numeric : Anumeric value is expected and not an expression. O1 = Part (b) How many revolutions does the turntable make while accelerating in Case 1? Numeric : A numeric value is expected and not an expression. n = Part (c) Calculate the magnitude of the angular acceleration of the turntable in Case 1, in radians/second?. Numeric : A numeric value is expected and not an expression. aj = Part (d) Calculate the magnitude of the angular acceleration of the turntable (in radians/second) while increasing to 120 RPM (Case 2). Numeric : A numeric value is expected and not an expression. az = Part (e) How long (in seconds) does it take for the turntable to go from fj = 78 to f2 = 120 RPM? Numeric : Anumeric value is expected and not an expression.
Problem 3: Case 1: A DJ starts up her phonograph player. The turntable accelerates uniformly from rest, and takes t = 10.4 seconds to get up to its full speed of fj = 78 revolutions per minute. Case 2: The DJ then changes the speed of the turntable from fj = 78 to f = 120 revolutions per minute. She notices that the turntable rotates exactly n2= 18 times while accelerating uniformly. Randomized Variables t = 10.4 seconds n2 = 18 times Part (a) Calculate the angular speed described in Case 1, given as fj = 78 revolutions per minute, into units of radians/second. Numeric : Anumeric value is expected and not an expression. O1 = Part (b) How many revolutions does the turntable make while accelerating in Case 1? Numeric : A numeric value is expected and not an expression. n = Part (c) Calculate the magnitude of the angular acceleration of the turntable in Case 1, in radians/second?. Numeric : A numeric value is expected and not an expression. aj = Part (d) Calculate the magnitude of the angular acceleration of the turntable (in radians/second) while increasing to 120 RPM (Case 2). Numeric : A numeric value is expected and not an expression. az = Part (e) How long (in seconds) does it take for the turntable to go from fj = 78 to f2 = 120 RPM? Numeric : Anumeric value is expected and not an expression.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter7: Rotational Motion And Gravitation
Section: Chapter Questions
Problem 15P: A car initially traveling eastward turns north by traveling in a circular path at uniform speed as...
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Rotational motion Q3
Transcribed Image Text:Problem 3: Case 1: A DJ starts up her phonograph player. The turntable accelerates uniformly from rest, and takes t1 = 10.4
seconds to get up to its full speed of fj = 78 revolutions per minute.
Case 2: The DJ then changes the speed of the turntable from fj = 78 to fɔ = 120 revolutions per minute. She notices that the
turntable rotates exactly n2= 18 times while accelerating uniformly.
Randomized Variables
tj = 10.4 seconds
n2 = 18 times
Part (a) Calculate the angular speed described in Case 1, given as fj = 78 revolutions per minute, into units of radians/second.
Numeric : Anumeric value is expected and not an expression.
Part (b) How many revolutions does the turntable make while accelerating in Case 1?
Numeric : A numeric value is expected and not an expression.
n =
Part (c) Calculate the magnitude of the angular acceleration of the turntable in Case 1, in radians/second².
Numeric : A numeric value is expected and not an expression.
a =
Part (d) Calculate the magnitude of the angular acceleration of the turntable (in radians/second?) while increasing to 120 RPM (Case 2).
Numeric : A numeric value is expected and not an expression.
a2 =
Part (e) How long (in seconds) does it take for the turntable to go from fj = 78 to f2 = 120 RPM?
Numeric : A numeric value is expected and not an expression.
t2 =
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