physics

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check my anwsers please.


How do we detect black holes?
I think you observe their gravitational influence on things around them
Is that correct?


Respectively, Einstein's special theory of relativity and his general theory of relativity replace Newton's theory whenever...?

I think its when the speed is very large and the gravitational force is very large.

Is that correct?



What would happen to your weight if you were to climb to the top of a mountain?
It would decrease, right?

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