Theory of Machine
The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be

Perpendicular to each other
Opposite to each other
Parallel to each other
Inclined at 45°

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Theory of Machine
Hammer blow

Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
Varies as the square root of the speed
Varies inversely with the square of the speed

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