23. [1pt ] * * What is the tension in the string? Answer: Submit All Answers 24. [ 1 pt ] * *x What is the speed of the bob? Answer: Submit All Answers 25. [ 1pt] AWW How long does it take the bob to make one full revolution (i.e., one complete trip around the circle)? Answer: Submit All Answers 26. [1pt] * * A mass m = 4.30 kg on a frictionless table is moving in a circle with radius 0.300 m at a constant speed. Mass m is attached to a mass M = 5.20 kg by a cord through a hole in the table. Find the speed with which m must move for M to stay at rest. Answer: Submit All Answers 27. [ 1 pt] * * A circular automobile racetrack is banked at an angle 0 such that no friction between road and tires is required when a car travels at 30.9 m/s. If the radius of the track is 416 m, determine 0. Answer: Submit All Answersm 22. [ 1pt ] Aww A bob of mass m = 1.50 kg is suspended from a fixed point by a massless string of length L = 1.50 m. The bob moves in a horizontal circle with the string always making an angle 0 = 160 from the vertical. For the position of the bob shown in the figure, which of the free body diagrams correctly describes the forces on the bob? Note that you only have two tries! A) B) C) D + Answer: Submit All Answers 23. [1pt ] * *x What is the tension in the string? Answer: Submit All Answers 24. [ 1 pt] * *x What is the speed of the bob?21. [1pt] Aww A ball is going around in a circle at constant speed, tethered to a string. The multiple images show where the ball is at 24 equally spaced times during one revolution. The arrows show the velocities when the ball is at the arrows's tail. Construct the vector Av, = 1-v. by graphically subtracting the corresponding arrows. This difference represents the average velocity change as the ball passes from point -1 to point 1 at the top of the circle. What happens to the acceleration if some of the parameters are modified? Match each of the three changes stated below with the corresponding change in magnitude of the acceleration, a. (If the first corresponds to B, and the next 2 to C, enter BCC) A. a quadruples. i. The radius of the circle halves and the period of rotation stays the same. B. a stays the same. ii. The period of rotation doubles and the radius stays the same. C. a quarters. iii. The period halves and the speed halves. (The radius changes as necessary.) D. a halves. E. a doubles. Answer: Submit All Answers19. [lpt] *t* A quarterback passes the football downfield at 15.5 m/s. It leaves his hand 1.90 m above the ground and is caught by a receiver 23.3 m away at the same height. What is the maximum height of the ball on its way to the receiver? Hint: This problem cannot be solved in a single step! You will need to use the reCipe twice. Answerz:] SubmilAllAnswers LastAnswer:Z.36m Incorrect, tries 3/15. Hint: This problem looks challenging7 but it is easy if split into two problems. First7 use the speed and range to find the angle. Then use the speed and angle to find the maximum height! In each case. the problem is much easier if you rephrase the question as What is when . as we did in the lecture. Uniform Circular Motion 20. [lpt] raw: Which of the following statements are true? Select all correct. If none correct. enter N. A. If an object is moVing at a constant speed in a circle. then the acceleration is parallel to the velocity vector. B. C entripetal acceleration produces a new force called the Centripetal Force. C. If an object is moVing at a constant speed in a circle. then the net force points towards the center of the circle. D. The centripetal acceleration depends on whether the object moves clockwise or counter-clockwise. E. If the speed of an object is constant but the direction is changing, then it will have a non-zero acceleration. ubm'rl All Answers 21. [lpt] raw: A ball is going around in a circle at constant speed. tethered to a string. The multiple images show where the ball is at 24 equally spaced times during one revolution. The arrows show the Velocities when the ball is at the arrows's tail. Construct the vector AvO : vr':1 by graphically subtracting the corresponding arrows. This difference represents the average velocity change as the ball passes from point -1 to point 1 at the top of the circle. What happens to the acceleration if some of the parameters are modified? Match each of the three changes stated below with the corresponding change in magnitude of the acceleration. (I. (If the first corresponds to B, and the next 2 to C, enter BCC)