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Physics 23 Online
OpenStudy (anonymous):

Black holes are huge masses which will pulls anything on its orbit or way. Even light cannot escape. So the force of black hole is greater than the speed of light. Isn't it???

OpenStudy (anonymous):

Gravity can bend light. The gravitational force of a black hole is so strong that light would be pulled back into it.

OpenStudy (anonymous):

Take a sample. If you should pull a running bike acrossing you, you need to faster than the bike in perpendicular, else it'll cross you. Similarly, if gravity has to pull the light, it should be faster than the light. So there's something faster than light is there.

OpenStudy (jamesj):

Forces don't have speed, so even if forces were the right way to think about this, your question doesn't quite make sense.

OpenStudy (anonymous):

The gravity of a black hole is more like a big well in the shape of space-time, rather than a force.

OpenStudy (anonymous):

F= ma, a = dv/dt, where F = m.dv/dt. Here, velocity taking part in force. Then?

OpenStudy (anonymous):

It's the change in velocity that takes part in the force. There is no force at constant velocity. The regular laws of gravity break down around a black hole. General Relativity describes gravity as mass creating a dent in space-time and the resulting curved space-time effects the path of a moving mass. That's why light bends as it passes a massive object, it is following the curve in space-time caused by the object. The curved space-time of a black hole is infinitely deep, so to speak, so light curves in, like water draining in a spiral down a sink, and never comes out the other side.

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