The 250-mm-radius circular plate shown is initially at rest and has an angular acceleration defined by the relation Knowing that T = 1.5 s and a =10 rad/s2 , determine the magnitude of the total...

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The 250-mm-radius circular plate shown is initially at rest and has an angular acceleration defined by the relation Knowing that T = 1.5 s and a =10 rad/s2 , determine the magnitude of the total acceleration of point B when (a) t = 0, (b) t = 0.5 s, (c) t = 0.75 s.