Applied Mechanics and Graphic Statics
A heavy ladder resting on a floor and against a vertical wall may not be in equilibrium, if

Floor is rough and the wall is smooth
Floor is smooth and the wall is rough
Floor and wall both are rough surfaces
Floor and wall both are smooth surfaces

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Applied Mechanics and Graphic Statics
Free body diagram is an

Isolated joint with internal forces acting on it
None of these
Isolated joint with only body forces acting on it
Isolated joint with all the forces, internal as well as external, acting on it

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Applied Mechanics and Graphic Statics
‘ω’ rad/sec is the angular velocity of a crank whose radius is ‘r’. If it makes θ° with inner dead centre and obliquity of the connecting rod ‘l’ is ‘ϕ’, the velocity v of the piston, is given by the equation

ω² (l sin ϕ - r cos θ tan ϕ)
ω² (l cos ϕ + r sin ϕ tan θ)
ω (l sin ϕ + r cos ϕ tan θ)
ω² (l sin ϕ + r cos φ tan θ)

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