midterm2sol_09 - In this version the first answer is the...

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77777 77777 Instructor: Biswas/Ihas/Whiting PHYSICS DEPARTMENT PHY 2053 Exam 2, 120 minutes November 13, 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 Neglect air resistance except when stated otherwise. All ropes, strings, and pulleys have negligible mass. 1. Cart 1 of mass m moves with a velocity of +1 m/s toward cart 2 which has a mass of 9 m and is at rest. Cart 1 collides elastically with cart 2. What is the velocity of cart 2 after the collision? (1) +0.2 m/s (2) +0.4 m/s (3) +0.6 m/s (4) +1 m/s (5) +0.8 m/s 2. Cart 1 of mass m moves with a velocity of +2 m/s toward cart 2 which has a mass of 9 m and is at rest. Cart 1 collides elastically with cart 2. What is the velocity of cart 2 after the collision? (1) +0.4 m/s (2) +0.2 m/s (3) +0.6 m/s (4) +1 m/s (5) +0.8 m/s 3. Cart 1 of mass m moves with a velocity of +3 m/s toward cart 2 which has a mass of 9 m and is at rest. Cart 1 collides elastically with cart 2. What is the velocity of cart 2 after the collision? (1) +0.6 m/s (2) +0.4 m/s (3) +0.2 m/s (4) +1 m/s (5) +0.8 m/s 4. What would be the gravitational force of attraction between the proton in the nucleus and the electron in an orbit of radius 5 . 3 × 10 - 11 m in a simple hydrogen atom? ( G = 6 . 67 × 10 - 3 Nm 2 kg - 2 ; proton mass = 1 . 67 × 10 - 27 kg; electron mass = 9 . 11 × 10 - 31 kg) (1) 3 . 6 × 10 - 47 N (2) 2 . 0 × 10 - 57 N (3) 6 . 1 × 10 - 28 N (4) 8 . 2 × 10 - 8 N (5) There is no gravitational attraction 5. A uniform ladder in static equilibrium leans against a frictionless wall (see figure). The ladder has length L and mass M . Given that the angle between the ladder and floor is 30 , what would be the minimum value of the coefficient of static friction ( μ s ) between the ladder and the ground? (1) 0.87 (2) 0.58 (3) 0.40 (4) 0.90 (5) 0.99 6. A meter stick is supported at each end by a spring scale. A heavy mass is then hung on the meter stick so that the spring scale on the left hand side reads four times the value of the spring scale on the right hand side. If the mass of the meter stick is negligible compared to the hanging mass, how far from the right hand side is the large mass hanging?
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