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Unformatted text preview: 77777 77777 Instructor(s): J. Ipser PHYSICS DEPARTMENT PHY 2004 Final Exam April 25, 2005 Name (print, last first): Signature: On my honor, I have neither given nor received unauthorized aid on this examination. YOUR TEST NUMBER IS THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE. (1) Code your test number on your answer sheet (use 76–80 for the 5-digit number) . Code your name on your answer sheet. DARKEN CIRCLES COMPLETELY . Code your UFID number on your answer sheet. (2) Print your name on this sheet and sign it also. (3) Do all scratch work anywhere on this exam that you like. Circle your answers on the test form. At the end of the test, this exam printout is to be turned in. No credit will be given without both answer sheet and printout with scratch work most questions demand. (4) Blacken the circle of your intended answer completely, using a #2 pencil or blue or black ink . Do not make any stray marks or some answers may be counted as incorrect. (5) The answers are rounded off. Choose the closest to exact. There is no penalty for guessing. (6) Hand in the answer sheet separately. g = 9 . 80 m/s 2 Hint: Try * problems first. 1. A rock is thrown straight down with speed 10 m/s from a height of 20 m above the ground. At the same moment, another rock is thrown straight up with speed 15 m/s. What is the height of the rocks when they cross each other? (1) 8.9 m (2) 4.3 m (3) 18.4 m (4) 12.6 m (5) 0 2. * A rock is thrown out horizontally from a tower of height 20 m. The rock hits the ground at a horizontal distance of 30 m from the base of the tower. What is the initial speed of the rock in m/s? 30 m 20 m (1) 15 (2) 10 (3) 20 (4) 25 (5) 30 3. Autos A and B have a head-on collision in 1 dimension. At time t = 0 the distance between the autos is 100 m. Each auto is initially traveling at 30 m/s. Auto A maintains constant velocity, while auto B decelerates at a constant rate of 10 m/s 2 . At what time t do the autos collide? (1) 2 s (2) 0.5 s (3) 3 s (4) 4.5 s (5) 9 s 4. On Earth a cannon can shoot a cannonball a distance of 1000 m if it is aimed at an angle of 45 ◦ above the horizontal. On planet X, the same cannon can shoot a cannonball a distance of 500 m if it is aimed at an angle of 60 ◦ above the horizontal. What is the acceleration of gravity on planet X in m/s 2 ? (1) 17 (2) 21 (3) 24 (4) 27 (5) 30 5. * A lady whose mass is 50 kg stands on a scale in an elevator. As the elevator approaches the ground floor from above, it is slowing at a rate of 3 m/s 2 . What is the reading on the scale for the lady’s apparent weight? (1) 640 N (2) 350 N (3) 120 N (4) 200 N (5) 75 N 77777 77777 6. Three masses M 1 = 1kg, M 2 = 2kg, and M 3 = 3kg are glued together and move above the ground. A force F = 200 N is applied in the downward direction to M 3 as shown. What is the magnitude of the force that M 2 exerts on M 3 ?...
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