A machine in a factory pushes a 500-N box forward with a horizontal force of 25 N for a time of 30 s. Ignoring friction, by how much does the momentum of the box change?
(A) 4.0 x 102 N • s (B) 7.5 x 102 N • s (C) 5.0 x 103 N • s (D) 1.5 x 104 N • s

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

Disney, viacom and aol time warner are examples of

Which sections of the heating curve illustrate this process?