Constants IPeriodic Table Part A As you finish listening to your favorite compac

Question

Constants IPeriodic Table Part A As you finish listening to your favorite compact disc (CD), the CD in the player slows down to a stop Assume that the CD spins down with a constant angular acceleration. If the CD rotates clockwise at 500 rpm (revolutions per minute) while the last song is playing, and then spins down to zero angular speed in 2.60 s with constant angular acceleration, what is , the magnitude of the angular acceleration of the CD, as it spins to a stop? Express your answer in radians per second squared View Available Hint(s) 20.1 rad/s2 = ious Ans Correct Part B How many revolutions does the CD make as it spins to a stop? Express your answer using three significant figures View Available Hint(s) revolutions SubmitPre Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining

Explanation / Answer

initial angular velocity is wo = 500 rpm = 500*(2*3.142/60) = 52.4 rad/s

final angular speed is w = 0 rad/s

angular accelaration is alpha = 20.1 rad/s^2 from part A

time taken is t = 2.6 sec

then

using kinematic equations

theta = (wo*t)+(0.5*alpha*t^2)

theta = (52.4*2.6)-(0.5*20.1*2.6^2) = 68.3 rad

no.of revolutions are n = 68.3/(2*3.142) = 10.8 rev

so complete rotations are 10 rev

type 10.8 as answer ,if it wont works then u can use 10.0

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