# Homework Help: Why's radial acceleration zero at north pole

1. Nov 27, 2005

### SS2006

a)Compute hte radial accleration of a point at the equator of the earth. b)repeat for the north pole of hte earth. Take the radius of the eartk to be 6370 km.

so for a) i got 9.9337 m/s square which is right
but for b) the answer is just zero
why?

2. Nov 27, 2005

### stuplato

You are at the "center" of rotation. You really are not moving anywhere are you? Just spinning...

3. Nov 27, 2005

### lightgrav

Whoa!

What Force could cause an acceleration as quick as 9.934 m/s^2 ?

I don't recall having to be tied down in Equador, to stay on the ground. (;->

4. Nov 27, 2005

### Tide

Yeah, but have you actually ever BEEN to the equator? ;)

5. Apr 11, 2011

### NZS92

Your part "a" isn't correct it says you need to find the acceleration not velocity, the velocity you find also incorrect.

6. Apr 19, 2011

### kokweng

hey.there's zero acceleration at poles because the R in the mrw^2 is approaching zero.or rather zero in this case.as it reaches the pole, the centripetal radius becomes zero, Fc=0 therefore, no acceleration.hope this helps.heh i'm new here.