Aflat sheet of ice has a thickness of 2.20 cm. it is on top of a flat sheet of crystalline quartz that has a thickness of 1.50 cm. light strikes the ice perpendicularly and travels through it, and then through the quartz. in the time it takes the light to travel through the two sheets, how far would it have traveled in a vacuum?

Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude f due to the other. with time, charge gradually leaks off of both spheres. when each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

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?