Earth's rotational speed when its gravity is 5.0m/s2

1. Mar 12, 2007

amosor

What will be the rotational speed of the Earth when gravity would be
only 5.0m/s2

2. Mar 12, 2007

Staff: Mentor

Why would it be different? Since this is a contrived hypothetical, you'll need to explain...Are you assuming its rotational momentum is the same and its inertia is different?

3. Mar 12, 2007

cesiumfrog

Odd question. Use of an arbitrary number implies homework. Maybe the OP misparaphrased something like "how much would the earth's spin need increase, in order to halve effective gravity at the equator"?

4. Mar 13, 2007

amosor

Yes, you express my question more precisely. Will you be kind to help me to calculate this speed and show me the way you do it?
Thanks.

5. Mar 14, 2007

amosor

Yes, you express my question more precisely. Will you be kind to help me to calculate this speed and show me the way you do it?
Thanks

6. Mar 14, 2007

Staff: Mentor

Well, do you know the equation for centripetal acceleration and the radius of the earth...?

7. Mar 14, 2007