Problem 3 Problem: A rail gun is formed by a wire of length 20cm slid- ing on infinite straight rails in a uniform 0.5T magnetic field directed out of the paper. The rail gun is pointed upwards. The rail's mass is 10g. Wire (a)Draw the direction of current flow such that the rail feels an upward magnetic force. (b)Compute the force of gravity on the rail. (c)What current must flow in the circuit so the magnetic force balances the force of gravity? Gravity

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.