An escalator in a department store is to carry people a vertical distance of 50 feet between floors. How long is the escalator if it makes an angle of 30° with the ground?.

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 causes the development of most clouds and precipitation in the atmosphere?

What structural formula represents 4 electrons shared between two atoms?