• Support PF! Buy your school textbooks, materials and every day products via PF Here!

Planetary motion the mass of the sun

  • Thread starter prospec
  • Start date
1. The problem statement, all variables and given/known data

Derive the equation using Newton's Law of gravitation and the equation for circular motion.


2. Relevant equations


V = [tex]\sqrt{\stackrel{GM}{r}}[/tex]

Where G is the universal gravitational constant, M is the mass of the central body and r is the radius of the orbit

3. The attempt at a solution


F= GM1*m2/r2


F= GMp*Ms/r2

Fc= MpV2/r

F=FC

GMpMS/r2 = mpV2/r

I'm not sure how to derive this equation ???
 

Janus

Staff Emeritus
Science Advisor
Insights Author
Gold Member
3,343
988
Your heading in the right direction, now all you do is re-arrange the last equation until you've solved for V. (hint: some of the variables at least partially cancel out.)
 

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads

Top