As shown in the figure, a cord is wrapped onto a cylindirical reel mounted on a fixed, frictionless, horizontal axle. When does the reel have a greater magnitude of angular acceleration? When the cord is pulled down with a constant force of 50 N. Oa. When an object of weight 50N is hung from the cord and released. Ob. The angular accelerations in parts (a) and (b) are equal. Oc. o d. It is impossible to determine.

As shown in the figure, a cord is wrapped onto a cylindirical reel mounted on a fixed, frictionless, horizontal axle. When does the reel have a greater magnitude of angular acceleration? When the cord is pulled down with a constant force of 50 N. Oa. When an object of weight 50N is hung from the cord and released. Ob. The angular accelerations in parts (a) and (b) are equal. Oc. o d. It is impossible to determine.

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter12: Rotation I: Kinematics And Dynamics

Section: Chapter Questions

Problem 28PQ

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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

As shown in the figure, a cord is wrapped onto a cylindirical reel mounted on a fixed, frictionless, horizontal axle. When does the reel have a greater magnitude of
angular acceleration?
When the cord is pulled down with a constant force of 50 N.
а.
b.
When an object of weight 50N is hung from the cord and released.
The angular accelerations in parts (a) and (b) are equal.
С.
It is impossible to determine.
d.

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