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finalsol_09 - 77777 In this version the first answer is the...

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77777 77777 Instructor: Biswas/Ihas/Whiting PHYSICS DEPARTMENT PHY 2053 Exam 3, 120 minutes December 12, 2009 Name (print, last first): Signature: On my honor, I have neither given nor received unauthorized aid on this examination. DIRECTIONS (1) Code your test number (THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE) on your answer sheet using lines 76–80. Write your test number down and take it with you. Code your name on your answer sheet. Code your UFID number on your answer sheet. (2) Print your name on this sheet and sign it also. (3) You may do scratch work anywhere on this exam. 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. (4) Fill in the circles of your intended answers completely on the answer sheet, 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, showing your UFID. Useful information: g = 9 . 80 m/s 2 Y Al = 7 . 0 × 10 10 Pa Y Cu = 11 × 10 10 Pa Neglect air resistance except when stated otherwise. 1 m = 3.281 ft. ρ water = 1000 kg/m 3 G = 6 . 67 × 10 - 11 Nm 2 /kg 2 speed of light c = 3 × 10 8 m/s 1. A cart moving across a level surface accelerates uniformly at 1.0 m/s 2 for 2.0 seconds. What additional information is required to determine the distance traveled by the cart during this 2.0-second interval? (1) initial velocity of the cart (2) net force acting on the cart (3) coefficient of friction between the cart and the surface (4) mass of the cart (5) initial position of the cart 2. An arrow is shot through an apple. If the 0.1 kg arrow changes speed by 10 m/s during the collision (from 30 m/s to 20 m/s) and the apple goes from rest to a speed of 2 m/s during the collision, then what must be the mass of the apple? (1) 0.5 kg (2) 0.2 kg (3) 0.8 kg (4) 1.0 kg (5) 2.0 kg 3. An arrow is shot through an apple. If the 0.1 kg arrow changes speed by 10 m/s during the collision (from 30 m/s to 20 m/s) and the apple goes from rest to a speed of 1 m/s during the collision, then what must be the mass of the apple? (1) 1.0 kg (2) 0.5 kg (3) 0.2 kg (4) 0.8 kg (5) 2.0 kg 4. An arrow is shot through an apple. If the 0.1 kg arrow changes speed by 10 m/s during the collision (from 30 m/s to 20 m/s) and the apple goes from rest to a speed of 5 m/s during the collision, then what must be the mass of the apple? (1) 0.2 kg (2) 0.5 kg (3) 0.8 kg (4) 1.0 kg (5) 2.0 kg 5. Why does a scientist in the International Space Station experience “weightlessness”? (1) She is in free fall along with the Space Station and its contents. (2) At an orbit of 200 miles above the Earth, the gravitational force of the Earth on her is 2% less than on its surface. (3) In space she has no mass.
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