An electromagnetic am band radio wave could have a wavelength of?
1) .005m
2) 5m
3) 500m
3) 5,000,000m

The frequency of choice-3 is

         (3 x 10⁸ m/s) / (500 m)  =  600,000 Hz.

That number is the 600 near the bottom of the AM radio dial.

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.