Complete the following sentences :
(i) The S.I. unit of moment of force is
(ii) In equilibrium, algebraic sum of moments of all forces about the point of rotation is
(iii) In a beam balance when the beam is balanced in a horizontal position, it is in
(iv) The moon revolving around the earth is in
(i) Nm
(ii) zero
(iii) static
(iv) dynamic