On Saturday, September 13, 2025 at 9:20:03 PM UTC-6 Brent Meeker wrote:
On 9/13/2025 12:42 PM, Alan Grayson wrote: *Your problem with the turnaround scenario is that you have apparently forgotten high school physics, where velocity is a vector having magnitude and direction, and **acceleration, which you want to avoid, is DEFINED as a change in velocity. Hence, **anything subject to a gravitational field is generally accelerating. * In GR free-fall is not accelerating. It is following the geodesic (straightest possible) path thru spacetime. Brent *You're not listening. Firstly, you claim you want to solve the TP without GR and without accelerating, yet you're invoking GR right here, directly. Secondly, I know about E's happy thought. But frankly I don't see how anyone can claim there's no accelerating when it's staring you in the face? I wonder how E resolved his happiest thought when accelerating surely exists in GR! It's still DEFINED as change in velocity AG* *Also, you're invoking GR when you claim there are no forces, presumably thinking that since F=ma, there can't be any acceleration in GR. I know that E's major insight was that gravity isn't a force, so invoking this insight is presumably why you claim there's no acceleration in the turnaround. But there is! It's undeniable. I can't find any error in your triplet scenario. AG* -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/ccbab9f3-2025-48f8-b8f3-ca8c79c906bbn%40googlegroups.com.
