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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 25. 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 14 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 xdirection and due North with the positive ydirection. 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 NorthEast 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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 Fall '11
 Galeazzi

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