16. How many minutes would it take a radio signal from Earth, traveling at the speed of light (3.00x108 m/s), to reach Mars, a distance of 4.8x107 miles. (1 mi = 1.609 km)

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

there are two significant figures.