Questions
Lower end B of a thin rod AB of length 1 m is made to move with a constant velocity of 1 m/s as shown in figure. Initial angle of inclination the rod with horizontal is Then magnitude of angular acceleration of the rod at t = 0.5 second is
detailed solution
Correct option is C
At time t, Let θ be the angle of inclination of the rod with horizontal and at that instant of time ‘e’ is the instantaneous centre of velocity of the rod. Therefore instantaneous angular velocity of the rod is given by ω=VBBC = Vl sin θ⇒ α = dωdt = − Vl cosec θ cot θNow, cos θ = vtl and at t=0.5 sec, cos θ = 1 × 0.51 = 12⇒ θ=600.∴ At t=0.5 s, α = − 1V cosec 600. cot 600 rad/sec2⇒ α = −23 . 13 rad/sec2 = −23 rad/sec2.Talk to our academic expert!
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Two steel ball of equal diameter are connected by a rigid bar of negligible weight as shown and are dropped in the horizontal position from height h above the heavy steel and brass base plates. If the coefficient of restitution between the ball and steel base is 0.6 and that between the other ball and the brass base is 0.4. The angular velocity of the bar immediately after rebound is. (Assume the two impacts are simultaneous).
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