"The Natural Philosopher" wrote in message
...
Norman Wells wrote:
The Natural Philosopher wrote:
Paul Martin wrote:
In article ,
Tim S wrote:

Seriously - yes, there is a mass increase.

I wind up my cuckoo clock. The driving weight (not the pendulum)
rises a metre. Has its mass increased due to the increase in
potential energy?


I think so, yes.

I guess that as the weights are further from the centre of the Earth, they
are moving in faster circles, and therefore have more mass according to
special relativity. Or summat.

--
Max Demian