radio signals travel at a rate of 3x10^8 meters per second.How many seconds will it take for a radio signal to travel from a satellite to the surface of Earth if the satellite is orbiting at a height of 9.90x10^7 meters?
9.90 * 10^7 m * ( 1 s / 3*10^8 m ) = 0.990 * 10^8 / (3 *10^8)
= 0.330 s