pHYS2211-SPRING2018 udent/Assignment-Responses/last?dep 18464421 rad/s Need Help
ID: 2038262 • Letter: P
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pHYS2211-SPRING2018 udent/Assignment-Responses/last?dep 18464421 rad/s Need Help? La My Notes Ask Your Teas -12 points S PSE9 10 P005 WI A wheel starts from rest and rotates with constant angular acceleration to reach an angular speed of 11.6 rad/s in 2.97 s. (a) Find the magnitude of the angular acceleration of the wheel. rad/s2 erval. (b) Find the angle in radians through which it rotates in this time int rad Need Help? Wasch My Notes Ask Your Tea O 4. O -1 points SePSE9 10 P006 A centrifuge in a medical laboratory rotates at an angular speed of 3500 rev/min. When switched off, it rotates 46.0 times before coming to rest. Find the constant angular acceleration of the centrifuge. rad/s Need Help?Rea 5. O -12 points SerPSES 10 P 007 MIFB My Notes Ask Your Tea An electric motor rotating a workshop grinding wheel at 1.08 x 102 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.02 rad/s?. (a) How long does it take the grinding wheel to stop? (b) Through how many radians has the wheel turned during the time interval found in part (a)? rad O Type here to searchExplanation / Answer
3A
wf = wi + alpha*t
alpha = (wf - wi)/t
wf = 11.6 rad/sec
wi = 0
t = 2.97 sec
alpha = (11.6 - 0)/2.97 = 3.91 rad/sec^2
3B.
theta = wi*t + 0.5*alpha*t^2
theta = 0*2.97 + 0.5*3.91*2.97^2
theta = 17.24 rad
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