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Fall 07 Phys 143l Practice Final

# Fall 07 Phys 143l Practice Final - Duke University...

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Duke University Department of Physics Physics 143 Fall Term 2007 PRACTICE FINAL EXAM I will abide by the Duke Community Standard. Name: This is a closed book exam, with two sides of one page cheat sheet allowed. Calculators are allowed, but only for basic calculations: you may not use special memory, graphing etc. functions. You must always show your work for credit. Each problem is worth 10 points. You must hand in your cheat sheet with your exam. Problem 1: Two events occur at the same point x 0 at times t 1 and t 2 in an inertial frame of reference S , which moves with speed v relative to S . What is the spatial separation of these events measured in S ? Problem 2: Two spaceships approach each other. They are each viewed from Earth as having a speed half that of light. What is their speed relative to each other? Problem 3: If you could convert 1 g of dirt directly into energy and you could sell the energy for 10 cents per kilowatt-hour, how much money would you get? Problem 4: Describe the Michelson-Morley experiment, and explain how its result is relevant to Einstein’s theory of special relativity.

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Problem 5: Consider two inertial reference frames. When an observer in each frame measures the following quantities or performs an experiment to test the fol- lowing laws, which experiments made by the two observers must yield the same result? Explain your reason for each answer.
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