Describe the following as a (a) distance (b) speed (c) acceleration (d) force

Infrared rays have a shorter wavelength than question 11 options: x-rays. ultraviolet rays. radio waves. gamma rays.

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?