Re: [Vo]:cannon balls and curling stones

2020-01-23 Thread H LV
On Wed, Jan 22, 2020 at 5:40 PM Jürg Wyttenbach wrote: > Unluckily the earth is not flat even in the curved sense as it is an > ellipsoid with at least a delta north-south/east-west in radius of about > 10km. > > Even more unluckily gravitation is not a constant it slightly depends on > the

Re: [Vo]:cannon balls and curling stones

2020-01-23 Thread H LV
I don`t think it matters if the planet is rotating since the surface is frictionless. Of course measuring a change of weight in the real world that is exclusively due to the rotation of earth is complicated by many variables. The link you provided on the reactive centrifugal force could be one

RE: [Vo]:cannon balls and curling stones

2020-01-23 Thread JonesBeene
Speaking of unusual thought experiments involving centripetal force, later found to be real products - here is a surprising old electrical device which explores the intersection of charge and mechanical spin. https://www.youtube.com/watch?v=h3EpyjATE48 It is a rotating anode tube (valve to

Re: [Vo]:cannon balls and curling stones

2020-01-23 Thread Andrew Meulenberg
Harry, For your ice covered planet, you may need to indicate if it is rotating or not and then, depending on your frame of reference, address Coriolis forces. This link addresses the weight at poles vs that at the equator.