PHY101_Exam1example

D the x component is larger at c than at b the y

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Unformatted text preview: he x component is larger at C than at B; the y component at B points up while at C, it points downward. (e) The x component is larger at B than at C; the y component at B points down while at C, it points upward. 7. A baseball batter hits an incoming 40-m/s fastball. The ball leaves the bat, in the opposite direction, at 50 m/s after a ball-on-bat contact time of 0.030 s. What is the force exerted on the 0.15-kg baseball? (3 points) (a) 450 N (b) 250 N (c) 90 N (d) 50 N 8. In a tug-of-war, each man on a 5-man team pulls with an average force of 500 N. What is the tension in the center of the rope? (3 points) (a) zero N (c) 500 N (e) 5000 N (b) 100 N (d) 2500 N Student Name:___________________________Student Number:_________ Problems: You MUST show ALL your work and use correct units for numerical answers to receive full credit! 9A. A chimpanzee sitting against his favorite tree suddenly gets up and walks 51 m due east and then 39 m due south to reach a termite mound, where he eats lunch. (a) What is the shortest distance between the tree and termite mound? (6 points) (b) What angle does the shortest distance make with respect to due east? (6 points) 9B. An observer, whose eyes are 1.83 m above the ground, is standing 32 m away from a tree. The ground is level, and the tree is growing perpendicular to it. The observer's line of sight with the treetop makes an angle of 20o above the horizontal. How tall is the tree? (7 points) Student Name:___________________________Student Number:_________ 10. A car travels along a straight path in three segments as follows: Segment 1: Start from rest with a constant acceleration of 2.77 m/s2 for 15.0 s Segment 2: Maintain a constant velocity for the next 2.05 min Segment 3: Apply a constant negative acceleration of -9.47 m/s2...
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This note was uploaded on 10/02/2008 for the course PHY 101 taught by Professor Pralle during the Fall '08 term at SUNY Buffalo.

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