4. A merry-go-round travels with a tangential speed of 3.5"/s. Its diameter is 34 m across? a) What is the centripetal acceleration of the merry-go-round?
b) How long does the merry-go-round take to go around once?
I
C) What is the centripetal force acting on a 45 kg rider 15 meters from the center of merry-go-round?

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