Strange question

  • Thread starter Werg22
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Homework Statement



Einstein's theory of general relativity is relativistic model of gravity. "Relativistic" means it involves the speed of light, c; "gravity" means it involves Newton's constant, G. Use dimensional analysis to derive a formula for the surface area, A, of a black hole of mass M, up to a dimensionless proportionality constant.

Homework Equations



N/A

The Attempt at a Solution



I have little idea of how to tackle this question. Any sort of help would be appreciable.
 

Answers and Replies

  • #2
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Can anyone be of help?
 
  • #3
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Bumping up again.
 
  • #4
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werg lol phys 121 assignment 1 question 3 lol... hahaha waterloo university right?
 
  • #5
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I couldn't do the last Problem... What did u get for (a) and (b)
 
  • #6
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As far as I can tell, the idea is to propose something along the lines of:

A= k*c^x*G^y*M^z

Where k is a dimensionless constant.

Then figure out what the exponents x,y and z must be so that the right hand has units of area (length^2). You should come up with a system of equations with only one solution.
 
  • #7
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I ended by figuring it out, thanks Proggle anyway. The question is kind of obscure and the solution isn't very intuitive.

Yes Karma I go to the University of Waterloo, I figured the same with you by your car race question.
 

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