Momentum principle to calculate speed

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Homework Help Overview

The discussion revolves around calculating the speed of a satellite in a circular orbit, involving concepts of momentum, gravitational force, and circular motion. The problem includes parameters such as the mass of the satellite and the Earth, as well as the radius of the orbit.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore various formulas related to circular motion and gravitational force, questioning which equations are applicable for determining the satellite's speed. There is discussion about using centripetal force and gravitational force equations.

Discussion Status

Some participants have provided guidance on relevant formulas and have engaged in a back-and-forth about the appropriate values to use in these equations. The conversation indicates a productive exploration of the topic, with participants building on each other's contributions.

Contextual Notes

Participants are working within the constraints of a homework problem, focusing on the application of physics principles without providing complete solutions. There is an emphasis on understanding the relationships between the variables involved.

shehan1
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1. A satellite of mass 8000 kg orbits the Earth in a circular orbit of radius of 9.5 106 m (this is above the Earth's atmosphere).The mass of the Earth is 6.0 1024 kg.

What is the speed of the satellite?



2. Pf = pi+Fnet + delta t


3. the only thing i knew to try was 2pi(r)/dt
 
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Think circular motion, centripetal force, Gravity.
 
Do i use F = (mv^2)/r ?
 
Well, that's one formula that you'll need. What are you going to use for the value of F?
 
GMm/ R^2 ?
 
That looks promising. Why not try it?
 
Thanks that helped a lot!
 

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