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Unformatted text preview: Dr. Gundersen and Dr. Galeazzi Phy 205DJ Test 1 22 September 2010 Signature: Name: 1 2 3 4 5 Idnumber: You must do the first problem which consists of five multiple choice questions. Then you can skip one of the four long problems numbered 2-5. Clearly cross out the page and the numbered box of the problem omitted. Do not write in the other boxes. If you do all the problems, only problems 1-4 will be graded. Each problem is worth 25 points for a total of 100 points. A formula sheet is provided on the LAST page which you can tear off. TO GET PARTIAL CREDIT IN PROBLEMS 2 - 5 YOU MUST SHOW GOOD WORK. CHECK DISCUSSION SECTION ATTENDED: [ ] Dr. Galeazzi 1O, 9:30 - 10:20 a.m. [ ] Dr. Willemsen 1P, 11:00 - 11:50a.m. [ ] Dr. Huffenberger 1Q, 12:30 - 1:20 p.m. [ ] Dr. Barnes 1R, 2:00 - 2:50 p.m. [ ] Dr. Gundersen 1S, 3:30 - 4:20 p.m. [ ] Dr. Nepomechie 3O, 9:30 - 10:20 a.m. [ ] Dr. Willemsen 3Q, 12:30 - 1:20 p.m. Physics 205DJ Test 1 22 September 2010 Dr. Gundersen and Dr. Galeazzi Phy 205DJ Test 1 22 September 2010 [1.] This problem has five multiple choice questions. Circle the best answer in each case. [1A.] The motion of an airplane leaving from Miami can be described using a Cartesian coordinate system with due East coincident with the positive x-direction and due North with the positive y-direction. The position vector r ( t ) of the plane as a function of time can then be written as vector r ( t ) = (50 . m s 3 ) t 3 ˆ i + (600 . m s ) t ˆ j . At what positive time is the airplane moving in the North-East direction? [a] t = 4 . 00 s [b] t = 4 . 000 s [c] t = 2 . 00 s [d] t = 2 . 000 s [e] t = 12 . s [1B.] You want to buy a heavy sofa and you need the help of your friend Bob. Starting from your house you travel 4 km east to pick up Bob, then 3 km north to get to the store, then you travel back home following a straight line from the store to your house. Each leg ofyou travel back home following a straight line from the store to your house....
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