Calculating Planet Mass from Stellar and Orbital Speed

[Dustin salinas]

Homework Statement

Stellar mass 3.8 x 10^30 kg
Star's orbital speed: 90 m/s
Planet's orbital speed: 95,000 m/s

Whats the mass of the planet in kilograms
[/B]

Homework Equations

The Attempt at a Solution

 

[HallsofIvy]

You seem to have forgotten to fill in "Relevant equations" and "The attempt at a solution"!

 

[Dustin salinas]

This is my sons homework I am just trying to get the answer and see if someone can show me how to get it so i can help him

 

[Andrew Mason]

Homework Statement

Stellar mass 3.8 x 10^30 kg
Star's orbital speed: 90 m/s
Planet's orbital speed: 95,000 m/s

Whats the mass of the planet in kilograms
[/B]

Homework Equations

The Attempt at a Solution

Can you find the distance to the centre of rotation from each body? What does that tell you about relative mass?

AM

 

[Dustin salinas]

No that's all the information he's given

 

[Herman Trivilino]

This is my sons homework I am just trying to get the answer and see if someone can show me how to get it so i can help him

We don't give out answers to homework questions, so that's why you're being asked to find the center of rotation. It's the same point as the center of mass.

We could teach you how to make the right answer, but instead we teach you how to make sense of the physics involved in making the answer. If you communicate the former to your son and not the latter it won't have any instructional value.

 

[Dustin salinas]

O ok apparently i came to the wrong forum. I thought i could just get help to teach him how to make the right answer. Like the formula to finding mass with those factors

 

[insightful]

I suggest that your son join Physics Forums.

 

[Dustin salinas]

Apparently him joining wouldn't get him closer to an answer

 

[Mark44]

Thread closed.

Apparently him joining wouldn't get him closer to an answer

As already mentioned, we aren't a service where someone posts a question and we give the answer. If your son wants help, he should become a member, and we will steer him in the right direction, but he has to show some effort.