3. Angular momentum and rotational kinetic energy A man with mass m stands on a freely rotating disk at angular speed of w. The radius of the disk is R, and its moment of inertia is I. If the man walks from the edge of the disk to the center, how much will be the angular speed and the kinetic energy changed?

3. Angular momentum and rotational kinetic energy A man with mass m stands on a freely rotating disk at angular speed of w. The radius of the disk is R, and its moment of inertia is I. If the man walks from the edge of the disk to the center, how much will be the angular speed and the kinetic energy changed?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

Answer all questions
Mario spins with arms outstretched holding dumbbells. In accord with angular momentum conservation we know that if he pulls his arms inward, rotational rate will increase. And we know that if he could extend his arms farther, rotational rate would decrease. But suppose he does neither, and simply drops the dumbbells. Then his rotational rate would A. increase. B. decrease. C. remain unchanged.
2. If the axis of rotation were moved from the center of the disk to the end of the disk (as shown in the diagram below), what would the moment of inertia be? Hint: you don't need to do another integral, just use the parallel axis theorem. As before, your expression should only depend on the variables M and R. G %23 99+ LGO
When the red light turns green at an intersection, you step on the accelerator and the speed of the car begins to increase from zero. If the radius of the wheel of your car is 0.48 meters, and the cars angular acceleration question: linear acceleration is a constant 8.5 meter per second squared, what is the angular acceleration of the cars wheels?
A figure skater brings her arms up to her body A figure skater spins at angular speed rotation of 2 revolutions per second with its two perpendicular arms to his body: in this position, his moment of inertia is 3 kg.m^2. When she brings her arms to her body, its moment of inertia is only 1.5 kg.m^2: calculate its rotational kinetic energy in this position. (We neglects the friction between the runners and the ice.)
A record player disk base with a mass of 420 g rotates freely at an angular speed of 33 1/3 rpm. A 25 g mouse is initially riding on the rim of the disk, 15 cm from the center. If the mouse walks to the center of the disk, will the disk rotate faster, slower, or at the same rate? Explain. Calculate the angular speed of the disk when the mouse reaches the center.
B8
9
hw 28 question 1 part b
Conservation of Angular Momentum An example of conservation of angular momentum is jumping on a Merry-Go-Round. Watch this video (it starts part way through but the only thing you miss is the people pushing the Merry-Go-Round) to see someone jumping on a Merry-Gr-Round in motion like this problem. You can model the Merry-Go-Round as a solid disk with a radius of 3.00 m and a mass of 75.5 kg. Initially the Merry-Go-Round has an angular velocity 7.90 radians / second. Then the person jumps on and change the Moment of Inertia of the system. The person lands on the outer edge of the Merry-Go-Round and has a mass of 60.0 kg. What is the final angular velocity of the system after the person jumps on? You can treat the person that jumps on a point mass (which means they are significantly smaller than the radius of the Merry-Go-Round) for this problem. Your answer should have the following: 2 Decimal Places Correct SI Units Appropriate Signs for Vector quantity answers Answers must be in the…
10 Kinetic Energy of a Dumbbell This problem illustrates the two contributions to the kinetic energy of an extended object: rotational kinetic energy and translational kinetic energy. You are to find the total kinetic energy Krotal of a dumbbell of mass m when it is rotating with angular speed w and its center translationally with speed v. (Figure 1)Denote the dumbbell's moment of inertia about its center of mass by Icm- Note that if you approximate the spheres as point masses of mass m/2 each located a distance r from the center and ignore the moment of inertia of the connecting rod, then the moment of inertia of the dumbbell is given by Iem = mr?, but this fact will not be necessary for this problem. mass is moving Part A Find the total kinetic energy Krot of the dumbbell. Express your answer in terms of m, v, Icm, and w. • View Available Hint(s) ? Krot = Submit Part B Complete previous part(s) Provide Feedback Figure 國

General physics 1 Give me solution What is the mass of an object traveling on a circular path with a radius of 2 meters and with a rate of 5 radians per second, given that its angular momentum is 140 kgm^2/s? A. 20 kg B. 7 kg C. 14 kg D. 10 kg