A can of beans that has mass M is launched by a spring-powered device from level ground. The can is launched at an angle of ag above the horizontal and is in the air for time T before it returns to the ground. Air resistance can be neglected. Part A How much work was done on the can by the launching device? Express your answer in terms of some or all of the variables M, T, ao and acceleration due to gravity g. W = Part B How much work is done on the can if it is launched at the same angle but stays in the air twice as long? Express your answer in terms of some or all of the variables M, T, ao and acceleration due to gravity g. Iνα ΑΣφ ? WB =

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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.