Which of the following is a pure substance? a. diamond b. granite (quartz, feldspar and mica c. air

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?

What are the north and south poles of a solenoid change with?

As more bulbs are added to a series circuit what happens to the resistance of the circuit