Earth's Orbital Speed Around the Sun

AI Thread Summary
The Earth orbits the sun at a radius of approximately 148 million km. To calculate its orbital speed, one can use the formula for speed as distance divided by time, considering the Earth completes one orbit in about 365 days. The distance traveled in this circular orbit is the circumference, which can be calculated using the radius. After performing the necessary calculations, the Earth's orbital speed is determined to be around 30 km/s. Understanding these calculations is essential for grasping Earth's motion in space.
Dragoon
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The Earth has an orbit of radius 148 million km around the sun. What is the speed of the Earth on this orbit?

dont know how to do it i have used a couple of different formulas and haven't gotten it right can anyone help?
 
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Can you not use v = rω and the fact that ω = 2π/T?
 
Dragoon said:
The Earth has an orbit of radius 148 million km around the sun. What is the speed of the Earth on this orbit?

dont know how to do it i have used a couple of different formulas and haven't gotten it right can anyone help?

How long does the Earth take to make an orbit around the sun?
What distance does the Earth travel in an orbit?
(Since the problem tells you that the orbit has a radius you can probably safely approximate the orbit with a circle of the appropriate radius.)
Then you can find speed using s=\frac{d}{t} although you might want to do some unit conversion.
 
NateTG said:
How long does the Earth take to make an orbit around the sun?
What distance does the Earth travel in an orbit?
(Since the problem tells you that the orbit has a radius you can probably safely approximate the orbit with a circle of the appropriate radius.)
Then you can find speed using s=\frac{d}{t} although you might want to do some unit conversion.
Period T = 365 days = ... seconds.
Then using formulae which Nylex gave.
 
What is the speed of the Earth on this orbit? 30km/s
 

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