Quiz09_13solutions

# The disk is of mass m 40 kg and radius r 20 m what

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: tates about an axis through the center of mass and perpendicular to the plane of the page, has two tangential forces acting on it as shown, F1 = 26 N and F2 = 14 N. The disk is of mass m = 4.0 kg and radius R = 2.0 m. What is the angular acceleration of the disk? (Take counterclockwise to be positive and use I = (1/2)mR2 for rotation of a disk around an axis through its center of mass.) Solution: Using ! net = I&quot; = 1 mR 2&quot; , and with CCW torque defined as positive, 2 1 F1R ! F2 R = mR 2! , or 2 != 2( F1 ! F2 ) 2(26 ! 14) = = 3.0 rad/s2 . mR ( 4.0 )(2.0 ) This is positive, so the acceleration is CCW, and the acceleration vector points out of the page. Physics 221 Quiz 9 Spring 2013 Name Section___________...
View Full Document

Ask a homework question - tutors are online