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Solutions Exams 1 &amp; 2

# Solutions Exams 1 &amp; 2 - 77777 77777 Instructor(s N...

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77777 77777 Instructor(s): N. Sullivan PHYSICS DEPARTMENT PHY 2004 Exam 2 October 20, 2010 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 lines 76–80 on the answer sheet 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. (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. If you believe that no listed answer is correct, leave the form blank. (6) Hand in the answer sheet separately. g = 9 . 80 m/s 2 1. (4 points) A force P holds an object weighing 30 N a distance 3 m from the wall as shown as in the figure. The tie rope T is tied 4 m above the horizontal line of action P. Calculate P. W = 30 N P 3 m 4 m T (1) 22.5 N (2) 45 N (3) 11.2 N (4) 4.5 N (5) — 2. (3 points) A ramp inclined at 30 degrees to the horizontal is used to haul a load of 100 N up a height of 1 m. What is the ideal mechanical advantage of this elementary machine?

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