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Sri
Sri asked in Education & ReferenceHomework Help · 3 months ago

Homework Help!?

Update:

I will not forget to mark as a favourite question for those who answered.

Update 2:

A little more clear answer will be good. That means, explanation of the formula and etc. Anyone else wants to submit me an answer with an explanation? Thanks a lot.

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2 Answers

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  • Bryce
    Lv 7
    3 months ago
    Favorite Answer

    a. v²/d= GMs/d²; v²= GMs/d; Ms= v²*d/G

    Ms= [2π*4.82*10^11/(422*24*3600)]² * 4.82*10^11 / 6.67*10^-11

    = 4.99*10^31 kg  

    b. Gbh/Gs= 1.99/30² / 4.99/(1.53*10^8)²≈ 1.04*10^13

    The black hole has a surface gravitational force 10 trillion times greater than the star!

  • Anonymous
    3 months ago

    Do not use Kepler's law to solve. 

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