Moderate speed
Slow speed
Highs peed
Any one of these

ωR cosθ
ω(R - r₁) sinθ
ω(R - r₁) cosθ
ωr₁ sinθ

## Theory of Machine The direction of linear velocity of any point on a link with respect to another point on the same link is

Parallel to the link joining the points
Perpendicular to the link joining the points
None of the listed here
At 45° to the link joining the points

## Theory of Machine Torsional vibrations are said to occur when the particles of a body moves

Perpendicular to its axis
Parallel to its axis
In a circle about its axis
None of these

## Theory of Machine The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)

m.ω².r sinθ
m.ω².r (cos 2θ/n)
m.ω².r cosθ
m.ω².r (sin 2θ/n)

## 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

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