1. The problem statement, all variables and given/known data An early major objection to the idea that Earth is spinning on its axis was that Earth would turn so fast at the equator that people would be thrown into space. Given : radius of earth = 6.37 × 106 m, mass of earth = 5.98 × 1024 kg , radius of moon = 1.74 × 106 m, and g = 9.8 m/s2 . Show the error in this logic by calculating the speed of a 91.7 kg person at the equator. Answer in units of m/s. well drawing a free body diagram, we have normal and gravitational forces- which equal each other..so isnt there no unbalanced force? because doesnt there need to be one to have centrifugal acceleration?