A large wooden turntable in the shape of a flat uniform disk has a radius of 2.0 m and a total mass of 120 kg. The turntable is initially rotating at 3.0 rad/s about a vertical axis through its center. If one applies a constant force tangentially to the edge of the turntable, one can slow down and а. eventually stop the turntable. What magnitude of such a force (constant) should be applied to stop the turntable in 30.0 seconds? b. paars While the turntable is rotating at 3.0 rad/s, if a 70.0 kg parachutist makes a soft landing on the turntable at a point near the outer edge. Find the angular speed of the turntable after the parachutist lands. (you can treat the parachutist as point particle.) Moment of inertia for a disk: I em =MR? %3D

A large wooden turntable in the shape of a flat uniform disk has a radius of 2.0 m and a total mass of 120 kg. The turntable is initially rotating at 3.0 rad/s about a vertical axis through its center. If one applies a constant force tangentially to the edge of the turntable, one can slow down and а. eventually stop the turntable. What magnitude of such a force (constant) should be applied to stop the turntable in 30.0 seconds? b. paars While the turntable is rotating at 3.0 rad/s, if a 70.0 kg parachutist makes a soft landing on the turntable at a point near the outer edge. Find the angular speed of the turntable after the parachutist lands. (you can treat the parachutist as point particle.) Moment of inertia for a disk: I em =MR? %3D

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)...

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Concept explainers

Angular speed, acceleration and displacement

Angular acceleration is defined as the rate of change in angular velocity with respect to time. It has both magnitude and direction. So, it is a vector quantity.

Angular Position

Before diving into angular position, one should understand the basics of position and its importance along with usage in day-to-day life. When one talks of position, it’s always relative with respect to some other object. For example, position of earth with respect to sun, position of school with respect to house, etc. Angular position is the rotational analogue of linear position.

Question

A large wooden turntable in the shape of a flat uniform disk has a radius of 2.0 m and a total mass of 120 kg.
The turntable is initially rotating at 3.0 rad/s about a vertical axis through its center.
If one applies a constant force tangentially to the edge of the turntable, one can slow down and
a.
eventually stop the turntable. What magnitude of such a force (constant) should be applied to stop the turntable in
30.0 seconds?
b. agai While the turntable is rotating at 3.0 rad/s, if a 70.0 kg parachutist makes a soft landing on the turntable
at a point near the outer edge. Find the angular speed of the turntable after the parachutist lands. (you can treat the
parachutist as point particle.)
Moment of inertia for a disk: I cm =
MR2

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