Kudu Support Question 1 (1 points) A rigid rod of length L rotates about an axis perpendicular to the rod, with one end of the rod fixed to the axis. Which of the following must always be equal at all points on the rod? 1. Angular position II. Angular velocity III. Angular acceleration IV. Tangential acceleration 13% Select the correct answer O I, II and III O III and IV O I, II, III, and IV O i and 11 0 I and No answer submitted 0 of 3 attempts used CHECK ANSWER Scroll to Questions = Kudu Support Question 2 (1 points) (#816101) {Rotational Kinematics) The figure shows a graph of angular velocity as a function of time for a car driving around a circular track. Through how many radians does the car travel in the first & minutes? Image size: 8 ML Max 13% 5346 (rad minute) 10 VI. 1 minutes) 12 Scroll to E Contents 2 Questions Kudu Support (rad minute) 10 13% (minutes) -10 Scroll to Questions = Kudu Support Question 3 This question contains multiple parts. Make sure to read all the instructions and answer each part. (#882009) {Rotational Kinematics) 13% Alice and Bob are each riding horses on a carousel. Alice's horse is twice as far from the axis of spin of the carousel as Bob's horse. Part a (1 points) Let wА be the angular velocity of Alice's horse, and let wo be the angular velocity of Bob's horse. Which of the following is true? Select the correct answer اند می هرات 0 OWA - wn OW W No answer submitted O of 2 attempts used CHECK ANSWER Part b (1 points) Scroll to 2 III Kudu Support No answer submitted 0 of 2 attempts used CHECK ANSWER Part b (1 points) Let A denote the speed of Alice's horse, and let up denote the speed of Bob's horse. Which of the following is true? 13% 55°C Select the correct answer OUA = Juni OVA - OWA = 0 O WA = 40p OUA - 2u No answer submitted O of 3 attempts used CHECK ANSWER Partc (1 points) Scroll to Contents Question Kudu Support No answer submitted O of 3 attempts used CHECK ANSWER Part (1 points) Let a, A denote the radial acceleration of Alice's horse and let ar, denote the radial acceleration of Bab's horse. Which of the following is most nearly true? Select the correct answer OG.,4 – 3ar, 13 13% + 190/ O 0,1 = ar, 0,4 – 30-B O 0,4 = 4ar, OQA - 20.7 No answer submitted O of 3 attempts used CHECK ANSWER Question 4 Scroll to 2 Questions Content = Kudu Support Question 4 This question contains multiple parts. Make sure to read all the instructions and answer each parl 13 (#602437) {Rotational Kinematics} +141/8 The hammer throw event in track and field involves spinning a heavy ball attached to a strong wire in a circle, then releasing it at just a particular moment in the throw, and at the particular angle, attempting to maximize the horizontal range of its trajectory away from the starting point. Image size: SML Max 4 Part a (1 points) Scroll to 2 E Contents Kudu Support No answer submitted 0 of 3 attempts used CHECK ANSWER Question 12 (1 points) (#835302) {Rotational Kinetic Energy} 13% +144604 Consider the motion of the forearm about the elbow during a baseball pitch (a baseball pitch involves several other motions as well, but we will focus on the rotation of the forearm about the elbow). The linear (tangential) velocity of the ball relative to the elbow joint is 20.8 m/s. Assume the ball a distance of 0.480 m from the elbow and that the moment of inertia of the forearm+ball combination is 0.429 kg . m, what is the rotational kinetic energy of the forearrn? Please enter a numerical answer below. Accepted formats are numbers or "e" based scientific notation e.g. 0.23, -2, 105, 5.231-8 Enter answer here No answer submitted O of 6 attempts used CHECK ANSWER Question 13 (1 points) Scroll to 个 Top Contents Back Questions = Kudu Support Question 13 1 (1 points) (#611274) Rotational Kinetic Energy} A4 kg, hollow sphere is rolling on a horizontal surface without slipping. What is the ratio of the sphere's rotational kinetic energy to its translational kinetic energy? 13% +12345 Select the correct answer 04/3 0 2/3 0 1/2 0 1 O 1/3 No answer submitted 0 of 3 attempts used CHECK ANSWER Question 14 (1 points) Scroll to E Contents 个 Top 2 Questione Back Kudu Support Question 14 (1 points) (#177525) (Rotational Kinetic Energy) A hollow sphere (ICON - MR) of mass 2.07 kg and radius 0.138 m rolls without slipping at a speed of 7.57 m/s toward an inclined plane, which is tilted 8 = 18.2 degrees above horizontal. The ball rolls up the incline plane, again without slipping. How far does the ball go up the plane (L) before it comes to a momentary stop? Assume there is negligible loss due to any friction in this process. Image size: SML Max L ө Please enter a numerical answer below. Accepled formals are numbers or 'e' based scientific notation e.g. 0.23, 2, 1e6 5.23e8 Enter answer here meters Scroll to 个 Contents Bact Top Questions Kudu Support Parta (1 points) At the moment that the hammer thrower shown above is spinning at an angular rate of 2.94 revolutions per second, with the ball located 1.35 m from the center axis of the spin, what is the tangential velocity of ball? Please enter a numerical answer below. Accepted formats are numbers or "e" based scientific notation e.g. 0.23,-2, 106, 5.231-8 13x Enter answer here m/s No answer submitted 0 of 6 attempts used CHECK ANSWER Part b (1 points) When a hammer thrower releases her ball, she is aiming to maximize the distance from the starting ring. Assume she releases the ball at an angle of 50.3 degrees above horizontal, and the ball travels a total horizontal distance of 33.9 m. what angular velocity must she have achieved (in radians/s) at the moment of the throw, assuming the ball is 1.35 m from the axis of rotation during the spin? [For this calculation, you may assume that hammer is released from ground level - treating the small actual release height as negligible relative to the distances involved in this problem] Please enter a numerical answer below. Accepted formats are numbers or 'e" based scientific notatione.g. 0.23,-2, 1e6 5.231-8 radians /second Enter answer here Scroll to Questions = Kudu Support No answer submitted O of 6 attempts used CHECK ANSWER Question 5 (1 points) (#665748) {Torque) A 30 cm wrench is used to loosen a bolt with a force applied 0.3 m from the bolt. It takes 60 N to loosen the bolt when the force is applied perpendicular to the wrench. How much force would it take if the force was applied at a 30 degree angle from perpendicular? Please enter a numerical answer below. Accepled formals are riurnbers or "e" based scientific notatione.g. 0.23, 2, 106, 5.23e-8 Enter answer here N No answer submitted O of 6 attempts used CHECK ANSWER Question 6 (1 points) For Workbook Module 9. Exercise 3c, rank the net torques. Select the correct answer 03>2 > 1 Scroll to E Curlentes 2 Questions Kudu Support Question 7 (1 points) (#468234) {Moment of Inertia) The triceps muscle in the back of the upper arm extends the forearm. This muscle in a professional boxer can exert a force of 1.24 x 10°N with an effective perpendicular lever arm of 3.38 cm, producing an angular acceleration of the forearm of 136 rad/s. What is the moment of inertia of the boxer's forearm? 13 13% [Note: the perpendicular lever arm is defined as r_ - rsin(@); it incorporates both the distance from the joint to the insertion point of the muscle group (by way of tendons) to the bone as well as the angle of the insertion] Please enter a numerical answer below. Accepled formals are numbers or 'e' based scientific notatione.g. 0.23, 2, 1e6 5.23e 8 Enter answer here kg - m? No answer submitted O of 6 attempts used CHECK ANSWER Question 8 (1 points) (#867266) {Moment of Inertla) Scroll to = Contents Questions = Kudu Support Question 8 (1 points) (#867266) {Moment of Inertia) A weight of mass 1.97 kg is suspended by a string wrapped around a pulley wheel, which consists of a solid disk of mass 5.23 kg and radius 1.03 m. The system is released from rest. Over what vertical distance does the hanging mass move in 3.0 seconds? Ignore friction and drag forces, and assume that the string does not slip. Image size: SML Max 13% м". 18 m Please enter a numerical answer below. Accepted formats are numbers or "e" based scientific notation e.g. 0.23,-2, 106, 5.231-8 Enter answer here _m Scroll to 2 Content MI Kudu Support Questions points) (#078493) Moment of Inertia) In fast-pitch softball, a pitcher swings her arm from straight overhead in a circle, releasing the 0.190 kg ball at the bottom of the swing. If a pitcher's arm has a length of 0.911 m and mass of 3.17 kg, and the ball goes from initially at rest to a tangential speed of 25.9 m/s before release, what average torque must the pitcher apply to the ball? Model the pitcher's arm as a uniform thin rod swung about one end, and make sure you don't forget the mass of the softball (but you can ignore its shape; i.e., treat it like a point mass). Hint: you will need to make use of the equations of circular motion for constant angular acceleration that we derived back in week 2. 13% + 127KUS Extra Credit as it involves some more advanced concepts on moment of inertia that we had no time to cover. Image size: SML 1 Scroll lo Curlento Question = Kudu Support Question 11 (1 points) (#761691) {Rotational Kinetic Energy} The net work done in accelerating a suspended wheel (hanging by its axle from a string) from rest to an angular speed of 50 rev/ min is W – 5900 J. What is the moment of inertia of the wheel? 13 Select the correct answer O 430.4 kg.mp 4916 kg.m O 2.362 kg - m O 118.1 kg.m? O 1054 kg.mº No answer submitted 0 of 3 attempts used CHECK ANSWER Question 12 (1 points) (#835302) {Rotational Kinetic Energy} Scroll to
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