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# 94786 - PHYS 2211 Test 3 November 6th 2008 Name(print...

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PHYS 2211, Test 3, November 6th, 2008 Name (print) Instructions Read all problems carefully before attempting to solve them. Your work must be legible, and the organization must be clear. You must show all work, including correct vector notation. Correct answers without adequate explanation will be counted wrong. Incorrect work or explanations mixed in with correct work will be counted wrong. Cross out anything you don’t want us to read! Make explanations correct but brief. Don’t write a lot of prose. Include diagrams! Show what goes into a calculation, not just the final number, e.g.: a · b c · d = (8 × 10 - 3 )(5 × 10 6 ) (2 × 10 - 5 )(4 × 10 4 ) = 5 × 10 4 Give standard SI units with your results. Unless specifically asked to derive a result, you may start from the formulas given on the formula sheet, including equations corresponding to the fundamental concepts. If a formula you need is not given, you must derive it. If you cannot do some portion of a problem, invent a symbol for the quantity you can’t calculate (explain that you are doing this), and use it to do the rest of the problem. Honor Pledge “In accordance with the Georgia Tech Honor Code, I have neither given nor received unauthorized aid on this test.” Sign your name on the line above

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PHYS 2211 Do not write on this page! Problem Score Grader Problem 1 (30 pts) Problem 2 (20 pts) Problem 3 (25 pts) Problem 4 (25 pts)
Problem 1 (30 Points) A simple device called a “ballistic pendulum” consisting of a wooden block suspended from thin strings can be used to measure the speed of a bullet. The wooden block has a mass of 3 kg. The strings are 0 . 8 m long and have negligible mass. (a 5pts) The bullet weighs 4 grams and travels at 650 m/s before striking the block. What is the speed of the block immediately after the bullet becomes embedded in the block? (b 10pts) After the collision the block swings upward. What is the maximum height (relative to its original position) reached by the block?

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(c 5pts) How much kinetic energy is converted to thermal energy during the collision?
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