Guide Questions: 1. What happened when you lift the tape up? Did the marble continue to travel in the same circular path for a while and then slow down, or not? 3. What do you think is the reason for your answer on number 1? Hint: For an object moving in a circle, there must be an inward force acting upon it in order to cause its inward acceleration. This is sometimes referred to as the centripetal force requirement. The direction of the net force is in the same direction as the acceleration.
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- A 55.8kg ice skater is moving at 4.03 m/s when she grabs the loose end of rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.797 m around the pole . A.)Determine the force exerted by the horizontal rope on her arms. B.) what is the ratio of this force to her weight16 re23. Consider the following diagram of a red car turning a corner (traveling counter-clockwise): a. Draw the centripetal acceleration and velocity vectors to demonstrate the motion of the car. 10 m b. If the car has a weight of 17,000N and is traveling with a speed of 15 m/s, what centripetal force does it experience? How many "g's" is this car experiencing during this turn? (compare the centripetal acceleration to gravity on Earth, 9.8 m/s^2) 66 с.
- After eating all your candy, you ride the Silly Silo, which sounds like an awful idea. The Silly Silo is a ride that used to be at Adventure Land. Watch the video at this link to see how it works. Notice that the floor drops out and everyone stays stuck to the wall. Imagine that the Silly Silo has a diameter of 5.5 m and it spins with a tangential velocity of 6.1 m/s. - What is the centripetal acceleration of a person stuck against the wall? - What is the minimum coefficient of friction that allows everyone to stick to the wall (and not slide up or down) during the ride.QUESTION 1 You swing a mass at the end of a sting in a vertical circle such that the string remains taut at all times. Which of the following forces is the centripetal force acting on the mass when it is at the bottom of the circular trajectory? a. the force of gravity b. the tension in the string c. the vector sum of the force of gravity and the tension d. a force other than the force of gravity and the tension QUESTION 2 A scale with a mass is placed inside an elevator. The scale reading will be the same when the elevator is moving at a constant velocity as when it is stopped. True FalseSuppose a 45 kg person rides a ferris wheel with a diameter of 62 meters. The ferris wheel completes one revolution in 32 seconds. a. calculate the person's apparent weight at the top. b. Calculate the person's apparent weight at the bottom. c. suppose the ride is sped up to where the apparent weight at the top is zero. what would be the time for one revolution?
- Two balls, X and Y, are spun at a velocity of 6.5 m/s in a horizontal circle on the path shown below. Ball X has a mass of 1.3 kg, and ball Y has a mass of 0.81 kg. Which statement best describes the centripetal acceleration and centripetal forces on the balls? A. Both balls will experience equal centripetal force and centripetal acceleration. B. Ball X will experience greater centripetal force and greater centripetal acceleration. C. Ball Y will experience greater centripetal force, but ball X will experience greater centripetal acceleration. D. Both balls will experience the same centripetal acceleration, but ball X will experience greater centripetal force.Q. 1 a. An object is revolving in a vertical circle. Draw a free-body diagram and apply the dynamics of circular motion to write equations at i. at the top of the circle ii. at the bottom of the circle b. The ball is swung in the horizontal direction. What force must a person exert on a string attached to the 0.5 kg ball to make it revolve in a horizontal circle of radius 3.0 m. The ball makes 120 rpm. c. The 0.5 kg ball is swung in a vertical direction on the end of s 3.0 m long cord of negligible mass. i. what is the minimum speed at the top of the circle so that the ball continues to move in a circle, and ii. what is the tension in the string if the speed at the bottom is triple the speed at the top.8. How is it possible that a body moves at a constant speed and is still in accelerating motion? 9. When a car is going around a circular track with constant speed, what provides the centripetal force necessary for circular motion?
- Children of mass 54 kg ride on a Ferris wheel as shown in Figure. Children move in a vertical circle of radius 14.5 m at a constant speed of 2.85 m/sec. = 0.56 m/sec² a) What is the centripetal acceleration each of the children? Answer: ac b) What is the normal force from the chair when a child is at the Top of the circle, as shown in the Figure? Draw a Free-Body Diagram for this situation in the figure below. Answer: NTop = 499.0 N c) What is the normal force from the chair when a child is at the Bottom of the circle, as shown in the Figure? Draw a Free-Body Diagram for this situation in the figure below. Answer: N Bottom = 559.4 N Top 7 Bottom RNumber 8 to 9 are togetherQuestion 8 A car is travelling into an unbanked turn with radius of 11.0 m. The coefficient friction is 1.4. What is the maximum speed the car can travel and still be able to maintain a circular path? Answer in m/s to one decimal place. Your Answer: Answer Question 9 A ball on the end of a string is swung in a vertical circle. The length of the string is 0.4 m. What is the minimum speed required to maintain the circular motion? Answer in m/s to one decimal place. Your Answer: Answer units