PART A: A vertical support rod is fixed at the center of a platform. A light string of length L is attached to the top of the support rod, and the other end of the string is attached to a sphere of mass m, as shown above. The platform rotates with an angular speed that can be varied. When the platform rotates with a constant angular speed w (omega), the string makes an angle 0 (theta) with the rod. Support Rod Platform L Om (a) Draw a vector that represents the net force exerted on the sphere at the moment shown above. Briefly justify your answer. (b) Is the magnitude of the tension in the string greater than, less than, or equal to the weight of the sphere? Explain your reasoning. (c) The string can never be completely horizontal no matter how fast the platform is rotating. Without writing any equations or formulas, explain why.