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Unformatted text preview: PHYS 125 Fall 2007 Exam 1 10/04/2007 - 1 - Form #1 Physics 125 Fall 2007: Exam #1: Solutions Form #1 Please print your name:_________________________________________ Please list your discussion section number:_________________________ Please list your discussion instructor:______________________________ Instructions ! Fill in your name above. ! Each exam will have a different version number which will need to be written in the area of the scantron marked Form. ! Record all your answers on the answer sheet provided. ! This will be a 1.5 hour, closed book exam. The exam includes 20 questions. ! You may use a 3x5 note card containing information you think might be useful. You can write on both sides of the card if you like. ! This is a closed-book exam. You may use a calculator which is for numerical calculations only and not to refer to stored information . ! There is only ONE correct answer for each multiple-choice question. No partial credit will be awarded. ! You may be asked to show your University student ID card when you turn in your exam. Discussion section reminder: Section 003 TUE/THUR 08:00-09:00 Salin Bernstein Section 004 TUE/THUR 09:00-10:00 Salin Bernstein Section 005 TUE/THUR 10:00-11:00 Salin Bernstein Section 006 TUE/THUR 12:00-13:00 Salin Bernstein Section 007 TUE/THUR 13:00-14:00 Salin Bernstein Section 008 TUE/THUR 14:00-15:00 Salin Bernstein Section 009 TUE/THUR 14:00-15:00 Konstantin Bobkov Section 010 TUE/THUR 15:00-16:00 Arthur Cole Section 011 TUE/THUR 16:00-17:00 Konstantin Bobkov Section 012 TUE/THUR 12:00-13:00 Andrew Tomasch Section 016 TUE/THUR 11:30-13:00 Arthur Cole Section 017 TUE/THUR 13:00-14:30 Arthur Cole Section 018 TUE/THUR 08:00-09:00 Andrew Tomasch Section 019 TUE/THUR 09:00-10:00 Andrew Tomasch PHYS 125 Fall 2007 Exam 1 10/04/2007 - 2 - Form #1 1. A plane travels at a speed of 300 km/h relative to the ground at an angle of 30 north of east. The wind travels at a speed of 100 km/h relative to the ground at an angle of 60 north of east. What is the velocity, magnitude and direction, of the plane to the wind? A) 219 km/h, 16.8 north of east** B) 219 km/h, 16.8 south of east C) 228 km/h, 18.4 north of east D) 412 km/h, 71.6 north of east E) 228 km/h, 18.4 north of east 2. For the figure shown below, which of the following are action reaction pairs? I) Force of friction of m 2 on m 1 and the force of friction of m 1 on m 2 II) The weight of m 2 and the normal force on m 2 III) The weight of m 2 and the weight of m 1 IV) The force of gravity on m 1 and force of m 1 on the Earth V) The normal force of m 2 on m 1 and the normal force of m 1 on m 2 A) I, II, V B) II, IV, V C) I, IV, V** D) I, II, III, IV, V E) IV, V #2 Solution: (I) Yes, the roles of the two actors are interchanged (II) No, both forces act on the same object (III) No, neither mass is acting on the other. Weight is an interaction with the earth (IV) Yes, the roles of the Earth and m 1 are interchanged (V) Yes, the roles of m 1 and...
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