Physics (1201/1202/2110/2112/2113) Gradebook ORION Downloadable eTextbook t>Open
ID: 2304395 • Letter: P
Question
Physics (1201/1202/2110/2112/2113) Gradebook ORION Downloadable eTextbook t>Open Assignment Question 1 At t-0, a flywheel has an angular velocity of 8.9 rad/s, an angular acceleration of -0.18 rad/s, and a reference line at 8o-0. (a) Through what maximum angle 0max will the reference line turn in the positive direction? What are the (b) first and (c) the reference line will be at e-emad67 At what (d) negative time and (e) positive time will the reference line be at ?--13 rad? times (a) Number (b) Number (e) Number (d) Number (e) Number Units Units Units Question Attempts: 0 of 12 used SAVE FOR LATER SUBMIT ANSWER John Wiley & Sons, Inc. All Rights A Division of John Wiley &Explanation / Answer
here,
w0 = 8.9 rad/s
angular accelration , alpha = - 0.18 rad/s^2
let the time taken to reverse the direction be t
w = w0 alpha * t
0 = 8.9 - 0.18 * t
t = 49.4 s
a)
the maximum angle , thetam = w0 * t - 0.5 * alpha * t^2
thetam = 8.9 * 49.4 - 0.5 * 0.18 * 49.4^2 rad = 220 rad
b)
theta = thetam /6 = 36.7 rad
let the time taken be t
theta = w0 * t + 0.5 * alpha * t^2
36.7 = 8.9 * t - 0.5 * 0.18 * t^2
solving for t
t = 4.31 s or 94.6 s
the first time is 4.31 s
c)
the seccond time is 94.6 s
d)
theta = - 13 rad
let the time taken be t
theta = w0 * t + 0.5 * alpha * t^2
- 13 = 8.9 * t - 0.5 * 0.18 * t^2
solving for t
t = - 1.44 s or 100.3 s
the negative time is - 1.44 s
e)
the positive time is 100.3 s