<p>Could anybody help me understand circular motion? </p>
<p>Here is the problem I am getting stumped on:</p>
<p>If a moon is orbiting a planet, how do you find the speed at which the moon rotates if you are given the period of orbit of the moon, the radius of the planet and the distance from the planet to the moon?</p>
<p>Any help would be appreciated. Thanks</p>
<p>Well obviously a full moon rotates more slowly than a quarter moon because it's bigger...duh. Sometimes the moon isn't even in the sky at nighttime. In that case it doesn't rotate at all.</p>
<p>^^^ :)</p>
<p>oh oops sorry.... I wrote it down wrongly.</p>
<p>I want to know how to find out the speed at which the moon REVOLVES AROUND the planet.</p>
<p>v = 2<em>pi</em>r/T</p>
<p>r = radius of planet + distance from planet to moon
T = period (in seconds)</p>