Theory of Machine
In a simple harmonic motion, the velocity vector with respect to displacement vector

Leads by 180°
Lags by 90°
Leads by 90°
Is in phase

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Theory of Machine
Which of the following property of the instantaneous center is correct?

The two rigid links have no linear velocity relative to each other at the instantaneous centre.
The velocity of the instantaneous centre relative to any third rigid link is same whether the instantaneous centre is regarded as a point on the first rigid link or on the second rigid link.
All of these
A rigid link rotates instantaneously relative to another link at the instantaneous centre for the configuration of the mechanism considered.

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Theory of Machine
Which of the following statements regarding laws governing the friction between dry surfaces are correct?

The friction force is directly proportional to the normal force.
All of these
The friction force is independent of me area of contact.
The friction force is dependent on the materials of the contact surfaces.

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