1. The problem statement, all variables and given/known data How long would a day have to be on Earth if there was zero net acceleration at the equator? 2. Relevant equations Ac=v^2/r Vrotational=Ac / Radius of earth g = 9.8m/ss T = earth's circumference / rotational velocity V= SQRT(Ac*R) Earth's Radius = 6.37x10^6 Earth's circumference = 40023890.41 3. The attempt at a solution The real acceleration of earth due to it's rotation is .03m/ss, but it doesn't really matter to us because g=9.8m/ss so we can stay on Earth. so the net acceleration in 9.8 - .34 if there was a zero net acceleration, then the acceleration of earth due to it's rotation would have to be 9.8m/ss, right? so doing V= SQRT(Ac*R), i get 7901.013m/s for the rotational velocity of the Earth. T = earth's circumference / rotational velocity, i get 506.56s, or, .141hrs. Is that correct?