Theory of Machine
Which is the false statement about the properties of instantaneous center?

The two rigid links have no linear velocities relative to each other at the instantaneous center
At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered
The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link
The double center can be denoted either by O2 or O12, but proper selection should be made

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Theory of Machine
The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the

Unbalanced forces are not dangerous at higher speeds
Unbalanced couples are caused only at higher speeds
Effects of unbalances are directly proportional to the speed
Effects of unbalances are proportional to the square of the speed

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