# Angular velocity help

1. Oct 24, 2005

### allstar1

angular velocity help!!!!!!!

Hi, I need help with the following 2 questions. My answers have *********
next to them. Any help is appreciated. Thank you.

1. A disk is rotating at a constant rate about a vertical axis through its center. Point Q is twice as far from the center of the disk as point P is. The angular velocity of Q at a given time is
Choices:
a) twice as big as P's
b) the same as P's *******************
c) half as big as P's
d) none of the above

i belive it's the same as P's, since and poing on radius r, has the same velocity on any point on the radius line.

2. When a disk rotates counterclockwise at a constant rate about a vertical axis through its center, the tangential acceleration of a point on the rim is
Choices:
a) positive.
b) zero. *******************
c) negative.

i belive it's zero, since it's rotating at a constant rate, which means the acceleration is zero.

Any help is appreciated. Thank you.

Last edited: Oct 24, 2005
2. Oct 24, 2005

### Tom Mattson

Staff Emeritus
According to the PF Global Guidelines (to which you agreed), you have to show your work before you can receive help.

3. Oct 24, 2005

### allstar1

work is show to my answers.

4. Oct 25, 2005

### allstar1

anyone????????