You are playing catch with a friend in a moving train. when you toss the ball in the direction the train is moving, how does the speed of the ball appear to an observer standing at rest outside the train?

i know it appears to be traveling faster than the train, but i don't know the technicalities

Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration

Two polarizers are oriented at 24.0∘ to one another. light polarized at a 12.0-degree angle to each polarizer passes through both. what is the transmitted intensity (%)?

Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? express your answer in terms of some or all of the variables s, q1, q2 and k =14ï€ïµ0. if your answer is difficult to enter, consider simplifying it, as it can be made relatively simple with some work.