What is the Schwarzschild radius of a black hole?
This is the radius of a sphere around a black hole, at the surface of which, for any object to be be free of its gravitational pull its escape velocity be equal to the speed of light.
RE
Related Physics A Level answers
All answers ▸Define electrical resistance
What is the critical angle of a beam of light leaving a transparent material with a refractive index of 2?
How am I going to remember all of the particles I need to know? (A-level Physics)
Two people sit opposite each other on the edge of a rotating disk of radius, R, and negligible mass. One person has a mass of 40kg, the other of 50kg. The disk is rotating at 30 revs/min. What is the rotational kinetic energy if R=1.5m?