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Please help asap Orbital speed

  • Thread starter agadag
  • Start date
59
0
Please help asap!! Orbital speed

1. Homework Statement


A satellite is placed in orbit 5.19x105m above the surface of Jupiter. Jupiter has a mass of 1.90x1027kg and a radius of 7.14x107m. Find the orbital speed of the satellite.
Answer = m/s


2. Homework Equations

v = sqrt [GM/r]
= (5.19 * 10^5)(1.90*10^27)/ (7.14*10^7+5.19*10^5) = 3.703 *10^12 is wrong!!!
 

Delphi51

Homework Helper
3,407
10
Re: Please help asap!! Orbital speed

Use G = 6.67 x 10^-11.
 
59
0
Re: Please help asap!! Orbital speed

ahhh i still didn't get the right answer..? maybe Im just doing my arithmatic wrong. but why would gravity = 6.67?
 
2,442
87
Re: Please help asap!! Orbital speed

G in the equation is the universal gravitational constant which has the value given by Delphi.For some reason you seem to have used the height of the orbit instead of G.
 
59
0
Re: Please help asap!! Orbital speed

well i assumed since we don't know the gravity of that planet the length of the orbit would be equal to the G. However, I am still not able to get the right answer using either method...
 
59
0
Re: Please help asap!! Orbital speed

I should say the length of the distance from the satellite to the planet... not the length of orbit...
 
2,442
87
Re: Please help asap!! Orbital speed

G is the universal gravitational constant,it applies to all planets,all masses,everything,it is completely different to distance.My best advice is to look at the theory behind this otherwise you are just fiddling around. To get the right answer you just need to plug the right numbers in your calculator.In your original attempt you had the wrong value for G so try again.
 
59
0
Re: Please help asap!! Orbital speed

yea i tried it again. still no success. I think i give up now.
 
2,442
87
Re: Please help asap!! Orbital speed

yea i tried it again. still no success. I think i give up now.
Did you calculate the right value for r?
7.14*10^7+5.19*10^5=7.19*10^7(approximately)
Did you take the square root at the end?
 

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