I'mthe mud flies off the Tyre of a moving bicycle moving bicycle along the tangent as it leaves the path of circular motion. Actually the mud is sticked with the surface of the Tyre due to adhesive force (the attraction force existing between the molecules of different surfaces). this adhesive force provide the necessary centripetal force to the mud to move in a circular path. if the speed of rotation is increased then at a certain instant this adhesive force becomes unable to meet the demand of centripetal force and hence, it will no longer move in circular path . As in the circular path mud has linear velocity along the tangent at very point so when it leaves its circular path it moves along tangent at that point ." why does a drive change his body position before diving in the pool: ? "Before lifting off the diving board , the driver's legs and arms are fully extended which means that the driver the driver has a large moment of inertia l1 about an axe.the moment of inertia is considerably reduced to a new value l2 , when the legs and arms are drawn into closed tuck position . As angular momentum is considered , so. l1w1=l2w2. where w1 and W2 are angular speed before and after diving . hence the diver spins faster when its moments of interia becomes smaller. " Explain how many minimum number of geo-stationary satellites are required for global coverage TV. transmission:? "A satellite communication system can be set up by placing several geo stationary satellite in orbit over different points on the surface of the earth.on such satellite cover 120¢ of longitude , so that whole of the populated earth surface can be covered by three correctly positional satellite".
