a box of mass m , sliding with an initial speed of v on a rough horizontal surface, runs into a fixed spring of elastic constant k , compressing it a distance x from its relaxed position before momentarily coming to rest.

An observer that stands still as the electron moves by him, will observe

The step-down transformer gives a current of 10a at 24v if the primary voltage is 240v calculate the 1_primary current 2_the power input 3_the power output

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?