The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of__________________?

A. their total sum is zero
B. two resolved parts in two directions at right angles are equal
C. sum of resolved parts in any two per-pendicular directions are both zero
D. all of them are inclined equally
E. none of the above

A. if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
B. if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
C. the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
D. positive and negative couples can be balanced
E. none of the above

A. more
B. less
C. same
D. more/less depending on composition
E. may have any value

A. plasticity
B. ductility
C. elasticity
D. malleability
E. drawabihty