Recent content by joeh1971

DaleSpam doesn't know what he is talking about. Newton's 2nd law is an empirical relation between force and acceleration, it is not a definition although some people do use it as an operational definition of mass. I can measure force and acceleration separately and Newton's 2nd law tells me the...

If you take a piece of steel wire and pull it with your fingers it is very difficult to stretch. However, if you coil that steel wire around a pencil it now becomes very easy to stretch. Why is a coiled wire (i.e.- a spring) really easy to stretch or squeeze but the same piece of metal, in the...

The regular twin paradox is usually solved from the accelerating twins perspective by thinking of the outgoing twin as just switching from one inertial frame into another inertial frame. This introduces a speeding up correction factor for the the clock that remains on earth. The Earth twin's...

This conclusion is based solely on the time dilation effect. Each twin sees the other moving away with a certain speed and then coming back. So if you have twins A and B. Twin A sees twin B's clock slow down relative to his own clock (i.e. relative to A's clock). Twin B sees twin A's clock slow...

Twin "Paradox" with no asymmetry Here is another variation of the twin paradox. Suppose we let both twins start their journey from a space station far from any heavenly bodies, so that the whole experiment can be carried out in free space. The twins Jack and John are equipped with identical...