Planet and speff problem find mass

  • Thread starter Thread starter physicsgurl12
  • Start date Start date
  • Tags Tags
    Mass Planet
Click For Summary

Homework Help Overview

The problem involves calculating the mass of a planet based on the gravitational force experienced by an individual at two different distances from the planet's surface. The context is rooted in gravitational physics.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the gravitational force equations and the relationship between weight and distance from the planet. There are attempts to set up equations based on the given weights at different distances, and some participants question the correctness of the equations being used.

Discussion Status

Participants are actively engaging with the problem, suggesting different equations and approaches. Some guidance has been offered regarding setting up equations based on the provided information, but there is no explicit consensus on the method to proceed.

Contextual Notes

There is mention of specific values for weight and distance, but the discussion indicates uncertainty about the correct application of the gravitational equations. Participants are also navigating the implications of using two different sets of information from the problem.

physicsgurl12
Messages
184
Reaction score
0

Homework Statement


The weigh tof spaceman speff, soley due to the gravitational pull of planet x at its surface is 389N. If he moves to a distance of 1.86*10^4km above the planets surface his weight changes to 24.31N. What is the mass of planet xif speffs mass is 75 kg.


Homework Equations



f=ma
f=gm1+m2/r^2

The Attempt at a Solution


i know the answers is 2.96*10^24 kg. nut idk how to get it
 
Physics news on Phys.org
I would double check your second equation.
 
it m1*m2
 
what else?? I am still not getting it
 
Use the F=G·m1·m2/r2 equation, and plug in the given information. There are two sets of information, so you would get two equations:

(1) 389 N = G · __ · __ / __
(2) Use the other weight given in the problem to set up the second equation
 

Similar threads

Replies
2
Views
3K
  • · Replies 2 ·
Replies
2
Views
4K
Replies
11
Views
3K
Replies
12
Views
2K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 9 ·
Replies
9
Views
3K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K