# Thread: Linear Speed of Earth

1. ## Linear Speed of Earth

The mean distance of Earth from the Sun is 9.29 x 10^7 miles. Assuming that the orbit of Earth around the Sun is circular and that 1 revolution takes 365 days, find the linear speed of Earth. Express your answer in miles per hour.

2. Originally Posted by magentarita
The mean distance of Earth from the Sun is 9.29 x 10^7 miles. Assuming that the orbit of Earth around the Sun is circular and that 1 revolution takes 365 days, find the linear speed of Earth. Express your answer in miles per hour.
You have missed out the part that says "with respect to a reference frame at rest with respect to the sun".

Circumference of orbit $\displaystyle C=2 \times \pi \times 9.29 \times 10^7$

Period in hours: $\displaystyle \tau=365 \times 24$

Speed in miles per hour $\displaystyle =C/\tau$

RonL

3. ## ok..

Are you saying that the linear speed of Earth is C/t?

4. Originally Posted by magentarita
Are you saying that the linear speed of Earth is C/t?
Yes

RonL

5. ## Thanks

I got it now. Thanks.

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