A merry-go-round rotates at the rate of 0.5 rev/s with an 83 kg man standing at a
point 2.2 m from the axis of rotation.
What is the new angular speed when the
man walks to a point 0 m from the center?
Consider the merry-go-round is a solid 54 kg
cylinder of radius of 2.2 m.
Answer in units of rad/s.

D. a  bar magnet with its south pole on the left

Current supplied to consumers from generating plants like coal power plant, nuclear power plant, geothermal and others are in form of alternating current instead of direct current because it can be transported easily in a long distance. also, the alternating current has a wide range of frequency and the amount or energy can be increased or decreased.