hello i am new to the forums. But I have been working on a packet of problems and I got them all done but i have been stuck on these two for a good hour. I have tried to search to internet for possible equations i could use but can't find any that will work or maybe i am just over looking them so i decided to post here and see what some other peoples thoughts are. But I am looking for some guidance on what equations to use.(adsbygoogle = window.adsbygoogle || []).push({});

~Thanks in advance

1. The problem statement, all variables and given/known data

An Earth satellite is orbiting at a distance from the Earth's surface equal to one Earth radius (4000miles). At this location, the acceleration due to gravity is what factor times the value of g at the Earth's surface?

-thoughts

i think im ight be using

F = GMm/r@2

where G is the universal gravitational constant.

G = 6.67*10-11 N-m2/kg2

and F = mg

2. The problem statement, all variables and given/known data

What angular velocity (in revolutions/second) is needed for a centrifuge to produce an acceleration of 1000g at a radius arm of 15cm?

-thoughts

none at the moment

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: 2 questions regarding circular motion and the law of gravity

**Physics Forums | Science Articles, Homework Help, Discussion**