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Unformatted text preview: which one of the following situations does the car have a westward acceleration? (3 points) (a) The car travels westward at constant speed. (b) The car travels eastward and speeds up. (c) The car travels westward and slows down. (d) The car travels eastward and slows down. (e) The car starts from rest and moves toward the east. 4. A rock is thrown vertically upward from the surface of the earth. The rock rises to some maximum height and falls back toward the surface of the earth. Which one of the following statements concerning this situation is true if air resistance is neglected? (3 points) (a) As the ball rises, its acceleration vector points upward. (b) The ball is a freely falling body for the duration of its flight. (c) The acceleration of the ball is zero when the ball is at its highest point. (d) The speed of the ball is negative while the ball goes up from the earth. 5. An eagle is flying due east at 8.9 m/s carrying a mouse in its legs. The mouse manages to break free at a height of 12 m. What is the magnitude of the mouse's velocity as it reaches the ground? Note: effects of air resistance are not included in this calculation. (3 points) (a) 22 m/s (b) 11 m/s (c) 8.9 m/s (d) 18 m/s (e) 9.8 m/s 6. A tennis ball is thrown upward at an angle from point A. It follows a parabolic trajectory and hits the ground at point D. At the instant shown, the ball is at point B. Point C represents the highest position of the ball above the ground.
C B A D While in flight, how do the x and y components of the velocity vector of the ball compare at the points B and C? (3 points) (a) The velocity components are non-zero at B and zero at C. (b) The x components are the same; the y component at C is zero m/s. (c) The x components are the same; the y component has a larger magnitude at C than at B. (d) T...
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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.
- Fall '08