This answer to this problem makes perfect sense. The reason it seams nonsensical at first has to do with the relative distances involved. That being 50' is a very small increase to a cable the size of the earths circumference. So one would naturally conclude that the height the cable will be off the ground will also be incredibly small. And actually it is. 8 feet is an incredibly small increase in height. From the center of the earth that is. The surface of the earth is errelivent to the problem. The problem lies in relating the 8 feet to the 50 feet in witch the 8 foot increase is a much larger percentage of 50 feet than 50 feet is to the circumference of the earth. That's what tricks people. It helps to view this problem as if you were a great distance from the earth looking down on the circle the cable makes. From that view the 8 feet is imperceptible. So once again mathamatics trumps common scene.