Theory of Machine
The swaying couple is due to the

Two cylinders of locomotive
Primary unbalanced force
Partial balancing
Secondary unbalanced force

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

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