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How to solve this problem?

Discussion in 'Physics' started by asdf arfw, Feb 20, 2018.

  1. asdf arfw

    Thread Starter Member

    Sep 9, 2017
    43
    0
    I found this question on some Japanese TVshow and I could not figured out.
    Find the radius of this black holes. when G= 6.67*10^-11 m^3.kg^-1.s^-2 , c = 3*10^8 , black hole's mass = 4.20*10^40 kg
    Can u find the answer with these information.
     
  2. WBahn

    Moderator

    Mar 31, 2012
    24,564
    7,701
    They probably mean the radius of the event horizon, which is simply the radius at which the escape velocity is the speed of light.
     
  3. MrChips

    Moderator

    Oct 2, 2009
    19,146
    6,152
    How do you solve this problem?

    What problem?

    Would it not be better to state the problem in the title in the first place?

    Such as: Find the radius of this black hole
     
    recklessrog likes this.
  4. BillO

    Distinguished Member

    Nov 24, 2008
    992
    139
    The Swarztschild radius is calculated thusly:

    Rs = 2GM/(C^2)
     
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