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f_f04_lanzara - Physics 7A Section 1 Fall 2004(Lanzara...

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Physics 7A- Section 1, Fall 2004 (Lanzara) FINAL EXAM Monday December 15, 2004 6:00-8.00 pm CLOSED BOOK GOOD LUCK! Print your name, student ID number, GSI name, and your discussion section number on the front of your blue book. This exam contains 6 questions, and will be graded out of a total of 130 points. You should answer all the questions to the best of your ability. You are allowed both sides of three sheets of handwritten notes, and the use of a calculator, but no QWERTY keyboards are allowed. Express all numerical results to 3 significant figures. The following are useful constants: The acceleration due to Earth’s gravity in the Bay Area is g = 9.80 m/s 2 . The Earths’s radius is r E = 6.38 × 10 3 km. The mass of the Earth is M E = 5.97 × 10 24 kg. Newton’s constant for universal gravitation is G = 6.67 × 10 -11 Nm 2 kg 2 . Please show all your work in your blue book. Explain the steps in your reasoning in coherent, English sentences. Define all symbols that you use. If you do not show relevant work for any part of the problem, you will not be awarded any credit, even if the answer is correct. If you recognize that an answer does not make physical sense, and you do not have time to find your error, write that you know that the answer cannot be correct, and explain how you know this to be true. (We will award some credit for recognizing there is an error.) For full credit, explain your reasoning carefully, show all steps neatly, and box your answers. Cross out any work you decide is incorrect, with an explanation in the margin. Do the easiest problems first. You may answer the questions in any order you wish, but please clearly label each problem by number to ensure that it is properly graded. DO NOT OPEN THIS EXAM UNTIL YOU ARE TOLD TO DO SO. STOP ALL WORK WHEN TOLD TO SO AT THE END OF THE EXAM. GOOD LUCK! Problem 1- [15 points] A man of mass m=60kg clings to a rope ladder suspended below a hot-air balloon of mass M=400kg. The balloon is stationary with respect to the ground.
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