0
answers
0
watching
73
views
23 Nov 2019
Starting from rest, a disk rotates about its central axis withconstant angular acceleration. In 8.0 s, it rotates 20 rad.
(a) What was the angular acceleration during this time?
____ rad/s2
(b) What was the average angular velocity?
____ rad/s
(c) What is the instantaneous angular velocity of the disk at theend of the 8.0 s?
____ rad/s
(d) Assuming that the acceleration does not change, through whatadditional angle will the disk turn during the next 7.0 s?
____ rad
Starting from rest, a disk rotates about its central axis withconstant angular acceleration. In 8.0 s, it rotates 20 rad.
(a) What was the angular acceleration during this time?
____ rad/s2
(b) What was the average angular velocity?
____ rad/s
(c) What is the instantaneous angular velocity of the disk at theend of the 8.0 s?
____ rad/s
(d) Assuming that the acceleration does not change, through whatadditional angle will the disk turn during the next 7.0 s?
____ rad
Related textbook solutions
Related questions
|
A disk of radius 25.0 cm is free to turn about an axle perpendicular to it through its center. It has very thin but strong string wrapped around its rim, and the string is attached to a ball that is pulled tangentially away from the rim of the disk (the figure (Figure 1)). The pull increases in magnitude and produces an acceleration of the ball that obeys the equation a(t)=At, where t is in seconds and A is a constant. The cylinder starts from rest, and at the end of the third second, the ball's acceleration is 1.90 m/s2 .
(a) Find A. (b) Express the angular acceleration of the disk as a function of time. (c) How much time after the disk has begun to turn does it reach an angular speed of 14.5 rad/s ? (d) Through what angle has the disk turned just as it reaches 14.5 rad/s ? |
