Una esfera de masa 20 gira en un plano horizontal con velocidad tangencial constante 0,5/. Se sabe que la distancia entre dos puntos opuesto de la circunferencia pasando por el centro es de 50cms ¿Cuál es el valor de la fuerza centrípeta que actúa sobre la esfera?

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