Strength of Materials
A number of forces acting at a point will be in equilibrium if

Sum of resolved parts in any two perpendicular directions are both zero
Two resolved parts in two directions at right angles are equal
All of them are inclined equally
Their total sum is zero

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Strength of Materials
In ideal machines

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

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