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

1. ### amosor

4
What will be the rotational speed of the Earth when gravity would be
only 5.0m/s2

### 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. ### 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. ### amosor

4
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. ### amosor

4
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

### Staff: Mentor

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

344