
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
 LinkBack  Thread Tools  Display Modes 
January 20th, 2018, 10:50 AM  #1 
Newbie Joined: Jan 2018 From: Sweden Posts: 1 Thanks: 0  Solving for mass
I have the following formula: $$m = \frac {4π^2} {GP^2}r1(r1+r2)^2$$ Where: G = 6.674x10^11 P = 10 years = 3.154x10^8 seconds r1 = 4.5x10^12 The task previewed this would be inputed with the values and simplified to: $$m = 2.6*10^7(4.5*10^{12}+r2)^2$$ but I simply can't solve the formula for that result. I was hoping someone could walk be through how to get specifically the value: $$2.6*10^7$$ cause that's where I'm stuck. Thanks in advance and I hope I put this question in the right place! (First post) 
January 20th, 2018, 11:32 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,114 Thanks: 1909 
Let's assume $G = (20/3)×10^{11}$ and $P^2 = 10^{17}$ approximately, so that $GP^2$ = (2/3)×10^7 approximately. Let's also approximate $4\pi^2r1$ as 178×10^12. That means 4$\pi^2r1$/((2/3)×10^7) is about (178/(2/3))×10^5, which is 2.67×10^7. Did you get something wildly different? 

Tags 
mass, solving 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Energy and mass  Alamar  Math  18  December 15th, 2015 08:58 AM 
What is the SI unit of mass?  girlbadatmath  Chemistry  10  October 16th, 2014 01:50 PM 
center of mass  boaz  Algebra  6  November 17th, 2013 12:40 PM 
Center of mass  slice_of_god  Real Analysis  1  June 4th, 2013 03:11 PM 
Solving For Mass, Given mass as constant and 1 unknown  DesolateOne  Elementary Math  1  December 16th, 2010 08:37 PM 