8 A stone is resting on a tum table and rotating around in a horizontal circle. Which of the following free-body diagram

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8 A Stone Is Resting On A Tum Table And Rotating Around In A Horizontal Circle Which Of The Following Free Body Diagram 1 (136.16 KiB) Viewed 11 times

8 A stone is resting on a tum table and rotating around in a horizontal circle. Which of the following free-body diagrams best represents the forces acting on the stone? B D FN E FN F FNF-4 FN F: F F F F F& d. D a. А b. B C. с E 9. The free-body diagram of a block being pushed up a rough ramp is best represented by A B с E FX F F 全。 了。 PE F FE F C a. zero - C. d. a. e. = 宜 FE F F F F. a. A b. B с d. D e. E 10. A 24-kg traffic light is suspended from the midpoint of a cable suspended between two poles. The angle between the cable and the pole is 80° at both poles. The net force acting on the traffic light has a value of b. 47 N c. 82 N d. 2.4 x 10°N e. 4.6 x 10°N 11. An object is pushed horizontally at a constant velocity. What can correctly be said about the forces acting on the object? a. The force(s) acting forward is/are greater than the force(s) acting backward. b. The sum of all forces has a value directed forward. The sum of all forces is zero. The forces acting on the object can be said be "unbalanced." e. Newton's second law best summarizes the effect of the forces acting on the object. 12. An elevator accelerates downward. What is the relationship between the gravitational force g acting on the elevator and the tension Ft in the cable that supports the elevator? Fel - F-1 b. 7/>F|CP| <A d. 7/2F| b. 13. A 425-g model rocket is accelerated upward at 86 m/s2 by its engine. What is the value of the force exerted by the engine on the rocket? a. 41 N [up] b. 41 N [down] c. 37 N [up] d. 32 N [up] e. 32 N (down) 14. An airplane has three gliders in tow behind it (glider 1 in front of glider 2 which is in front of glider 3). If Fri represents the force of the airplane on glider 1, Ft2 represents the force of glider I on glider 2, and Fr3 represents the force of glider 2 on glider 3, then which of the following statements correctly represents the relationships among these three forces? Fril - P = F 6. Pol>Fral > FCF | < | Fral< Fold. Fra > Fol > Pole Pos b 15. Imagine that you are travelling in a train and you have a drink sitting on the dining table in front of you. The train suddenly stops and the drink ends up in your lap. What force acting on the drink is responsible for its sudden motion? a. the force of the table acting on the drink d. the force of the drink on itself b. the force of the track on the wheels e. There is no force acting on the drink that is responsible for its motion. the force of the wheels on the track A 1.8-kg object is pulled along the floor with a force of 7.0 N acting horizontally. If the object accelerates at 2.4 m/s2, how much kinetic friction is acting? 30 N b. 11 N c. 8.3 N d. 7.8 N 2.7 N a. c. 16. a. e.