If I were determining the mass of a black hole, would I do it the same way as if it were a planet?
depends on what way you do it to find the mass of the planet.... but i think the mass of a black hole is found using the gravitational field it exerts on the surroundings
If you have the BH in a binary system (with an ordinary star for example), then yes, you measure the mass of the BH by just calculate it from the obseravional data using keplers law and so on.
no i think maybe you have to work back from its entropy
Go back in history, how you deduced for the first time that black holes exists. You use planetary motion, keplers laws etc.
As Malawi said, in general you would use Kepler's laws just as for any object. Even in the case of a fairly tightly orbiting blackhole-blackhole or neutronstar-neutronstar binary this works pretty well.
Andrewj's suggestion is nonsense.
actually i was checking out the thing abut the using enthropyto find the mass of the black hole and apparently it is possible ( i never knew that till now myself :uhh:) but i found in this link that it is possible
using the entropy we find the heat of the black hole which is actually the mass-energy of the black hole
yes vazier, in theory. But not in practice.
No; you'd better read that again. (Hint: extensive versus intensive quantities!)
As Malawi said, using Kepler is a practical method. No-one has yet detected (or hopes to detect) the Hawking radiation from any black hole!--- it's much too weak.
i see...... thanks for telling that.... i will go through a few more articles to understand the thing better
i agree with Vazier
That's too bad, since as already pointed out he made at least two major errors in what he wrote.
2 major errors?
Yes--- reread what you wrote and then reread my comment.
okay ... i got it i guess XD
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