What is the altitude above earth's surface?

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Homework Help Overview

The problem involves determining the altitude of a satellite above Earth's surface based on its orbital speed and the gravitational force acting on it. The context is centered around gravitational forces and circular motion in physics.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss relevant equations, including gravitational force and circular motion. There are questions about how to identify the mass of the satellite and its radius, as well as the application of gravitational equations.

Discussion Status

The discussion is ongoing, with participants exploring different equations and concepts related to gravitational attraction and circular motion. Some guidance has been offered regarding the need to show work before receiving further assistance.

Contextual Notes

Participants are reminded of the forum rules requiring them to demonstrate their work, which may influence the depth of the discussion. There is uncertainty regarding the necessary parameters for the calculations, such as the mass of the satellite and its orbital radius.

oosta
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Here's the question. I'm not sure how to apporoach it.

A satellite has an orbital speed of 4.2 x 10 exponent 3 m/s. What is the altitude above Earth's surface? (M of Earth = 5.98 x 10 exponent 24 kg, radius of Earth = 6.38 x 10 exponent 6 m)
 
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What equations do you think apply? What do you know so far about forces in circular motion? What is the general equation for the gravitational attraction of two masses?

You must show us your work before we can offer much in the way of tutorial help (see the "Rules" link at the top of the page).
 
ok well, i think i should use the equation Fg = Gmm over r^2

but i don't know how to find the other mass. and the radius of the satellite.
 
oosta said:
ok well, i think i should use the equation Fg = Gmm over r^2

but i don't know how to find the other mass. and the radius of the satellite.

That's one of the two equations you need. What is the equation for uniform circular motion that relates the velocity (angular or orbital linear) to the mass, radius and central force?
 

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