(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

*Part 1*

A satellite is in a circular orbit 4000 km above

the Earth’s surface; i.e., it moves on a circular

path under the inﬂuence of nothing but the

Earth’s gravity. Find the speed of the satellite. The radius of the Earth is 6.37 x10^6 , and the acceleration of gravity at the satellite’s altitude is3.71055 m/s^2.

Answer in units of km/s

*Part 2*

Find the time it takes to complete one orbit

around the Earth.

Answer in units of s.

2. Relevant equations

a=v^2/r

Fc=mv^2/r

3. The attempt at a solution

For part one, I used a=v^2/r (3.71055=v^2/(6.37x10^6+4,000,000) and then converted it to km/s. I got 3.84784035 km/s which was wrong. Am i doing something wrong?

I also have no idea how to do part 2 :(

**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: Circular Motion (Orbiting Objects)

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