HW-Ch11 - HW-CH11 9th Edition CH11 Problems: 46, 60, 79, 85...

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

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

Unformatted text preview: HW-CH11 9th Edition CH11 Problems: 46, 60, 79, 85 8th Edition CH11 Problems: 48, 58, 75, 93 46. The rotational inertia of a collapsing spinning star drops to 1 its initial 3 value. What is the ratio of the new rotational kinetic energy to the initial rotational kinetic energy? 60. In Fig. 11-54, a 1.0 g bullet is ...red into a 0.50 kg block attached to the end of a 0.60 m nonuniform rod of mass 0.50kg. The block-rod-bullet system then rotates in the plane of the ...gure, about a ...xed axis at A. The rotational inertia of the rod alone about that A is 0.060 kg m2 . Treat the block as a particle. (a) What then is the rotational inertia of the block-rod-bullet system about point A? (b) If the angular speed of the system about A just after impact is 4.5 rad/s, what is the bullet' speed s just before impact? 79. Wheel A and B in Fig. 11-62 are connected by a belt that does not slip. The radius of B is 3.00 times the radius of A. What would be the ratio of the rotational inertias IA =IB if the two wheels had (a) the same angular momentum about their central axes and (b) the same rotational kinetic energy? 85. A girl of mass M stands on the rim of a frictionless merry-go-round of radius R and rotational inertia I that is not moving. She throws a rock of mass m horizontally in a direction that is tangent to the outer edge of the merry-go-round. The speed of the rock, relative to the ground, is . Afterward, what are (a) the angular speed of the merry-go-round and(b) the linear speed of the girl? 1 ...
View Full Document

This note was uploaded on 05/14/2011 for the course ECON 101 taught by Professor Asdaf during the Spring '11 term at Universidad de San Buenaventura Bogota.

Ask a homework question - tutors are online