Theory of Machine
The unbalanced force due to reciprocating masses

Varies in magnitude but constant in direction
Varies in direction but constant in magnitude
Constant in magnitude and direction both
Varies in magnitude and direction both

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Theory of Machine
A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?

The centre of the disc has centrifugal acceleration
All points of the disc have the same velocity
The centre of the disc has zero acceleration
The point on the disc making contact with the plane surface has zero acceleration

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