A brass wire which is 4.00 m long and 4.00 mm in diameter hangs from the ceiling. If a mass of 5.00 kg stretches the wire by 0.160 mm, the stress in the wire is (Note: Young's modulus for brass is, E = 100 x 10° N/m²) 9.7x105 N/m2 3.9×106N/m2 3.9xl05 N/m2 7.8×103N/m2

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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.