Recent content by ardenbook

Here is the paradox. If spaceship B and C hover in a uniform gravitational field using their rocket motor with same power. Then, according to Einstein's equivalence principle, it is the same as ship B and C undergone identical acceleration programmes in free space. But we know for sure...

Could you please elaborate a bit why -- During the period of acceleration, B will observe C speeding ahead, while C will observe B falling behind. (assuming that C is in front)

Could you please elaborate a bit why the string breaks, Thanks...

Is length contraction relative or absolute?? This is from the book "Speakable and unspeakable in quantum mechanics" by J.S. Bell. Three small spaceships, A, B, and , drift freely in a region of space remote from other matter, without rotation and without relative motion, with B and C...

Can you tell me if it dampen or not dampen ?? If it dampens, then the radiating energy comes from gravity and shows that gravity is a force. But in GR, we were taught that gravity is not a force and objects move in geodesic if no other force acts on it.

If I drill a hole through the center of a motionless asteroid, and drop a charged object down it, If the hole goes all the way through, the particle will oscillate, speeding up as it moves towards the center, and slowing down as it moves away. If radiating, we'd expect the oscillations...