Which of the following best summarizes the quantum model of atoms? a. electrons reside in known positions in fixed orbits around the nucleus. b. electrons are waves that travel in known paths around the protons. c. electrons display some properties of waves and while they reside outside of the nucleus, their positions cannot be known with certainty.

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?