Recent content by billyboy

Hello I often go climbing. When I went with a guide recently he told me that you should be especially carefull when climbing when you only have a small length of rope paid out arguing that because the rope is so short at this point it must take a large shock under a fall. Conversley, if you...

Has anyone considered the following. If I have a really big disc and rotate it at a certain angular velocity. Then at some distance from the centre the tangential speed of the disc will equal the speed of light and any distance beyond will have a speed greater than that of light. Obviously...