Four forces act on a point 150 gm SE, 300 gm due S 60" W.280 gm due W and 180 gm 60" S of E. (a) What single force wil replace the four forces? (b) What single force
(called the equilibrant) would balance the four forces? Solve algebraically,

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants