Recent content by Skids

Just looked at that video. That was helpful. Regarding the plane. If an airliner is traveling along at say 800km/h at 10,000m and releases a rock, veiwed from another airliner traveling in the same direction and velocity then according to the evidence of that video I reckon the rock would...

Thanks again. I see your point about ignoring air resistance. The motion is idealized. It's a model with some simplifications. So basically we start out with horizontal motion, which remains, but there is increasing vertical motion contributing to the change in direction and velocity. Which is...

Hi, thanks for your responses. I'm getting the idea I think. It is hard to imagine the ground as moving and the dude on the boat as stationary. I'm was sort of imagining the rock falling in a linear fashion, not parabolic. Something like y proportional to -x. But then, because Gravity...

Hi, I've been reading Vic. Stenger's book "The comprehensible Cosmos" and have a question about the example he gives for Galilean invariance. In his example, Galileo drops a weight from the tower of Pisa and to a person standing near the tower (and thus in the same inertial? frame of the tower)...