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Posted: **Thu Jul 07, 2022 12:05 pm**

: Rotation G 20 Problem 3 Case 1 A Dj Starts Up Her Phonograph Player The Turntable Accelerates Uniformly From Rest 1 (13.47 KiB) Viewed 13 times

: Rotation G 20 Problem 3 Case 1 A Dj Starts Up Her Phonograph Player The Turntable Accelerates Uniformly From Rest 2 (19.22 KiB) Viewed 13 times

Rotation g (20%) Problem 3: Case 1:A DJ starts up her phonograph player. The turntable accelerates uniformly from rest, and takes t;= 108 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 f = 78 to f2= 120 revolutions per minute. She notices that the turntable rotates exactly n₂= 14 times while accelerating uniformly. Randomized Variables 11 = 108 seconds n₂ = 14 times
Part (a) Calculate the angular speed described in Case 1. given as f = 78 revolutions per minute, into units of radians/second. Part (b) How many revolutions does the turntable make while accelerating in Case 1? Part (c) Calculate the magnitude of the angular acceleration of the turntable in Case 1, in radians/second². Part (d) Calculate the magnitude of the angular acceleration of the turntable (in radians/second) while increasing to 120 RPM (Case 2). Part (e) How long (in seconds) does it take for the turntable to go from f = 78 to f₂ = 120 RPM? 1₂= sin() cos() tan()) 7 (789