Strength of Materials
A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if

the floor is smooth, the wall is rough
the floor and wall both are rough sur-faces
the floor and wall both are smooth surfaces
the floor is rough, the wall is smooth

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Strength of Materials
In ideal machines

mechanical advantage is unity
mechanical advantage is greater than velocity ratio
mechanical advantage is equal to velocity ratio
mechanical advantage is less than velocity ratio

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