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Unformatted text preview: 77777 77777 Instructor(s): Muttalib/Seiberling PHYSICS DEPARTMENT PHY 2053 Exam 2 October 31, 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 7 6—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 m 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. Useful numbers: 9 = 9.80 m/s2 G = 6.67 x 10‘11 N mz/kg2 If A woman lifts a barbell 2.0 m in 5.0 s. If she lifts it the same distance in 10 s, the work done by her is: ( BMW.“ «4' Mi» .Vl slum} M-i ML“ ) W M n Ca'm‘a'o‘l chufi , the same (2) four times as great (3) two times as great (4) half as great (5) one-fourth as great 2. An object is dropped from rest. Neglecting all frictional effects, y which of the following graphs most accurately represents its mo- @ H tion? (a t. +1.; mat madame-J ”0%) E E E E E t t | : ‘ : bummed H y H y H .V H y H y A B C D E @s (2) A (3) B (4) C (5) D 3. A student’s life was saved in an automobile accident because an airbag expanded in front of his head. If the car had not been equipped with an airbag, the windshield would have stopped the motion of his head in a much shorter time. Compared to the windshield, the airbag: Q exerts a much smaller force. causes a much smaller change in momentum. (3)exerts a much smaller impulse. / . ‘ - causes a much smaller change in kinetic energy. $0 2 ( b ) ”A ‘0 does much more work. 2 ( \ O) ; 20 some P over more time greater 1mm} 59. 4. If a satellite moves above the Earth’s atmosphere in a circular orbit with constant speed, then: its acceleration is toward the Earth. ' its acceleration and velocity are in the same direction. (3) the net force on it is zero. (A) its velocity is constant. (5) it will fall back to Earth when its fuel is used up. 175 ...
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