Question

The bar AB, wAB=9rad/s

What is the angular velocity of the member BC

What is the angular velocity of the member CD

Where is the instantaneous center of rotation for the member BC. Also, what is the location of B relative to Q(rB/Q)

300 mm А B ФАВ 500 mm 0 = 60° C 200 mm D

Answer 1

We know B II Isu are I. centre of 1 e By applying 114 I g3 134 I24 114, IR, Ius and primary I-centres BC ne Iz4 kenndy's theorm *3' relatuely moving links should have I-centres on a straight line. * 4,1 and 2 relatuely move each other. Draw a line forning Ily and I say line 0 * 2,3 and 4 relatevely move. Draw another line Jorning Tv3 und Tey and say line o Intersection of line 0 and line @ gives us ILY Hence I centre of Be lies at a B Now VB Vc Ws = N AB AC 2 W = WAB XAB AB 30" Ily W2 = WAB a radlje Wi=WBC = a radlec Ac= 500 Xcono -> W2 = Vc AC miche → Vc = 9X500XCOS 30 again I 34 ! Wz Io CD 91500X0a30 200 W3 = 19.4856 rad /sec)

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