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## Homework Statement

A friendly Brazilian has a mass of 150 kg. Being in Brazil, he rotates in a circle around the center of the earth once per day, The radius of this circle (which is essentially the radius of the Earth) is 6.40 x 10^6 m.

I have found that the normal force is 1.4649 x 10^3.

## Homework Equations

a

_{c}= v

^{2}/r , centripetal acceleration

[itex]\Sigma[/itex]F=ma

v = (2[itex]\pi[/itex]r)/T , T is period of one revolution

## The Attempt at a Solution

I only got to mg - F

_{n}= ma

_{c}

I know what the apparent weight is but I'm not sure about the normal force. If I can find this, then I can then find a

_{c}, v, and then T to find about the length of day.