A student, standing on a scale in an elevator at rest, sees that his weight is 840 n. as the elevator rises, his weight increases to 1050 n, then returns to normal. when the elevator slows to a stop at the 10th floor, his weight drops to 588 n, and then returns to normal. What would two quantitative force diagrams look like and what is the net force equation for the axis along which forces are not balanced?

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