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Common Data Questions:
An instantaneous configuration of a four-bar mechanism whose plane is horizontal, is shown in the figure below. At this instant, the angular velocity and angular acceleration of link O2A are ω=8 rad/s α=0, respectively, and driving torque(τ) is zero.The link O2A is balanced so that its centre of mass fails at O2.

At the instant considered, what is the magnitude of the angular velocity of O4B

A
1 rad/s
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B
3 rad/s
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C
8 rad/s
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D
64/3 rad/s
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Solution

The correct option is B 3 rad/s

θ=16060240=60CO2

CO2=144 mm

Now, ω4ω2=I12I24I14I24=144(240+144)

ω48=144384

ω4=144384×8=3 rad/s

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