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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 m 2 are interchanged " # " # " # " # " # PW PG WG PG WG PG WG : 300 km/hr cos 30°,300 km/hr sin 30° 259.8 km/hr, 150 km/hr 100 km/hr cos 60°,100 km/hr sin 60° 50 km/hr, 86.6 km/hr 259.8 km/hr,150.0 km/hr - 50.0 km v v v v v v v \$ % \$ \$ #1 Solution ! ! !
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