00:01
What is the orbital speed of earth around the sun? so let's draw our sun here.
00:09
Okay, and here's the earth.
00:15
Obviously not to scale.
00:17
And the earth is going around the sun in a nice orbit.
00:22
Okay, so how fast is it going? what's its velocity at meters per second? well, we know that distance equals velocity times time.
00:36
So how far does the earth travel, let's just say in one orbit.
00:45
So when it makes one complete orbit around the sun, how far is that? well, it's the circumference of a circle, 2 pi times r.
00:55
Right, r is the orbital radius.
00:58
Okay, so that's the distance traveled equals velocity times time.
01:04
Now i chose the entire one complete orbit, because how long does it take to complete one orbit? 365 days, right? so the velocity is just 2 pi times the orbital radius divided by the time...