- #1
nightcleaner
I have been reading about Mach space in Dr. Brian Greene's recent book, "The Fabric of the Cosmos", and must admit I am somewhat confused. This is not Dr. Greene's fault, I am sure. I was hoping for some clarification here. I will try to summarize what I found in Dr. Greene's book.
Mach proposed that in free empty space, with no uneven field or distant object to be related, a spinning object will not feel the centripetal forces. In common language, in totally empty space, how could it know it was spinning, without any distant object to relate itself?
My understanding is that objects are composed of parts. Did Mach neglect the fact that the parts are related to each other? An astronaut spinning in free space still feels his hands pulled outward, because his hands are accelerated in relation to his body. He doesn't need distant stars to know this. What am I missing?
Thanks,
nc
Mach proposed that in free empty space, with no uneven field or distant object to be related, a spinning object will not feel the centripetal forces. In common language, in totally empty space, how could it know it was spinning, without any distant object to relate itself?
My understanding is that objects are composed of parts. Did Mach neglect the fact that the parts are related to each other? An astronaut spinning in free space still feels his hands pulled outward, because his hands are accelerated in relation to his body. He doesn't need distant stars to know this. What am I missing?
Thanks,
nc