If you have an old bicycle take the crank pedal assembly out and used it. I would even keep the whole shaft and bearing and sprocket. just torch cut the part from the frame and grind it smooth.
Otherwise, one trip to the junkyard will reveal many potential candidates.
The motion of a near-Earth satellite is affected by various forces. One of these forces is the Earth's central gravitation and the others are known as perturbations. These perturbations are classified into gravitational and non-gravitational forces. In ...