What is the speed of light in a vacuum? What would happen to this speed as it enters a different medium?
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Give an example in which the electrical energy changes to light energy

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?

Acar traveling at a constant speed of 22.0 m/s passes a trooper hidden behind a billboard. one second after the speeding car passes the billboard, the trooper sets off in chase with a constant acceleration of 3.50 m/s2. how long does it take the trooper to overtake the speeding car? solve this problem by a graphical method. on the same graph, plot position versus time for the car and the trooper.