Multiple choice

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 $\omega8red/s$ and$\alpha=0$, respectively, and the driving torque $(t)$ is zero. The link O2A is balanced so that its center of mass falls at O2.

At the same instant, if the component of the force at joint A along AB is 30 N, then the magnitude of the joint reaction at O2

  1. is zero

  2. is 30 N

  3. is 78 N

  4. cannot be determined from the given data
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

From the given data the component of force at joint A along $AO_2$ is necessary to find the joint reaction at $O_2$. So, it is not possible to find the magnitude of the joint reaction at $O_2$

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