Oldhw27 - This print-out should have 13 questions Multiple-choice questions may continue on the next column or page – find all choices before

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A circular disk, a ring, and a square have the same mass M and width 2 r . disk 2 r ring 2 r square 2 r For the moment of inertia about their cen- ter of mass about an axis perpendicular to the plane of the paper, which statement concern- ing their moments of inertia is true? 1. I ring > I square > I disk 2. I ring > I disk > I square 3. I square > I disk > I ring 4. I square > I ring > I disk correct 5. I disk > I square > I ring 6. I disk > I ring > I square Explanation: In the ring, the same mass of the disk is concentrated at the maximum distance from the axis, so I ring > I disk . In the square, the same mass of the ring lies at distances which are between r and r √ 2 ( at least the radius of the ring), so I square > I ring and I square > I ring > I disk . 002 (part 1 of 2) 10.0 points Two particles move in opposite directions along a straight line. Particle 1 of mass m 1 = 25 kg at x 1 = 26 m moves with a speed v 1 = 28 m / s (to the right), while the particle 2 of mass m 2 = 47 kg at x 2 = − 20 m moves with a speed v 2 = − 36 m / s (to the left). Given: Counter-clockwise is the positive angular direction. d 1 m 1 m 2 x 2 x 1 v 1 v 2 d 2 A B x y What is the total angular momentum of the system about the z-axis relative to point A along y axis if d 1 = 17 m? Correct answer: 16864 kg m 2 / s. Explanation: The angular momentum along z axis is given by L = r p sin θ , where p is the total linear momentum. We find that p = m 1 v 1 + m 2 v 2 , where v 2 is negative. Since at point A r sin θ = − d 1 , we find l A = d 1 p = − d 1 (...
View Full Document

This note was uploaded on 05/02/2009 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas at Austin.

Page1 / 4

Oldhw27 - This print-out should have 13 questions Multiple-choice questions may continue on the next column or page – find all choices before

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online