Look at the figure shown above. It is a solid disk rotating in the counterclockw
ID: 1480501 • Letter: L
Question
Look at the figure shown above. It is a solid disk rotating in the counterclockwise direction about a frictionless axle at its center of mass. The string does not slip on the disk. The axis is perpendicular to the plane of the page. Mass points a and b have been glued on the face of the disk. Which point has a larger linear speed while the disk is rotating?
Which point has a larger angular speed about the axis of rotation while the disk is rotating?
What is the direction of the centripetal acceleration vector of mass point b? Use the figure on the right to choose the direction if it is in the plane of the paper, otherwise consider the remaining options.
J. Out of the page.
K. Zero.
What is the direction of the tangential acceleration vector of mass point b? Use the figure on the right to choose the direction if it is in the plane of the paper, otherwise consider the remaining options.
K. Zero.
What is the direction of the angular velocity vector of the disk?
K. Zero.
What is the direction of the angular acceleration vector of the disk?
K. Zero.
What is the direction of the net torque vector on the disk?
A. a B. b C. c D. d E. e F. f G. g H. h I. Into the page.J. Out of the page.
K. Zero.
What is the direction of the tangential acceleration vector of mass point b? Use the figure on the right to choose the direction if it is in the plane of the paper, otherwise consider the remaining options.
A. a B. b C. c D. d E. e F. f G. g H. h I. Into the page. J. Out of the page.K. Zero.
What is the direction of the angular velocity vector of the disk?
A. a B. b C. c D. d E. e F. f G. g H. h I. Into the page. J. Out of the page.K. Zero.
What is the direction of the angular acceleration vector of the disk?
A. a B. b C. c D. d E. e F. f G. g H. h I. Into the page. J. Out of the page.K. Zero.
What is the direction of the net torque vector on the disk?
A. a B. b C. c D. d E. e F. f G. g H. h I. Into the page. J. Out of the page. K. Zero.Explanation / Answer
1. Which point has a larger linear speed while the disk is rotating?
speed is given by v = Rw
as b is at a greater distance from axis , b would have greater speed.
2. Which point has a larger angular speed about the axis of rotation while the disk is rotating?
both points have same angular speed as angular speed of every point on body is same
3) What is the direction of the centripetal acceleration vector of mass point b
centripital acceleration s towards center so answer is towards 'f'
4) What is the direction of the tangential acceleration vector of mass point b? Use the figure on the right to choose the direction if it is in the plane of the paper, otherwise consider the remaining options.
tnagential acceleration is along the tangent so the answer is 'h'
5) What is the direction of the angular velocity vector of the disk?
angular velocity vector is directed out of the page.
6) What is the direction of the angular acceleration vector of the disk?
angul acceleration vector is directed out of the page.
7) What is the direction of the net torque vector on the disk?
the direction of net torque is out of the page
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