47. I| A ant riding on the top. The ball expn ant does not. What is the magnitude of the normal on the ant when the ball's speed is 2.0 m/s? 48. Il A 70 kg tightrope walker stands at the center of a rope. The Challe Tope supports are 10 m apart and the rope sags 10° at each end. The tightrope walker crouches down, then leaps straight up an acceleration of 8.0 m/s² to catch a passing trapeze. tension in the rope as he jumps? 53. I T with tens What is the the fric 49. I| Find an expression for the magnitude of the horizontal force F in FIGURE P7.49 for which m, does not slip either up or down along the wedge. All surfaces are frictionless. WE asino EA avall m2 FIGURE P7.49 bicunteadne 54. II 50. IL A rocket burns fuel at a rate of 5.0 kg/s, expelling the exhaust gases at a speed of 4.0 km/s relative to the rocket. We would like to find the thrust of the rocket engine. a. Model the fuel burning as a steady ejection of small pellets, each with the small mass Am. Suppose it takes a short time At т olda erate a pellet (at constant acceleration)

47. I| A ant riding on the top. The ball expn ant does not. What is the magnitude of the normal on the ant when the ball's speed is 2.0 m/s? 48. Il A 70 kg tightrope walker stands at the center of a rope. The Challe Tope supports are 10 m apart and the rope sags 10° at each end. The tightrope walker crouches down, then leaps straight up an acceleration of 8.0 m/s² to catch a passing trapeze. tension in the rope as he jumps? 53. I T with tens What is the the fric 49. I| Find an expression for the magnitude of the horizontal force F in FIGURE P7.49 for which m, does not slip either up or down along the wedge. All surfaces are frictionless. WE asino EA avall m2 FIGURE P7.49 bicunteadne 54. II 50. IL A rocket burns fuel at a rate of 5.0 kg/s, expelling the exhaust gases at a speed of 4.0 km/s relative to the rocket. We would like to find the thrust of the rocket engine. a. Model the fuel burning as a steady ejection of small pellets, each with the small mass Am. Suppose it takes a short time At т olda erate a pellet (at constant acceleration)

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter6: Uniform Circular Motion And Gravitation

Section: Chapter Questions

Problem 7CQ: A number of amusement parks have rides that make loops like the one shown in Figure 6.33. For...

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A number of amusement parks have rides that make loops like the one shown in Figure 6.33. For safety, the cars are attached to the rails in such a way cannot fall off. If the car goes over the top at just the right speed, gravity alone will supply the centripetal force. What other force acts and what is its direction if: (a) The car goes over the top at faster than this speed? (b) The car goes this speed? Figure 6.33 Amusement rides with a vertical loop are an example of a form of curved motion.