Physics for Scientists and Engineers
10th Edition
ISBN: 9781337553278
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Chapter 11, Problem 49CP
In Example 11.8, we investigated an elastic collision between a disk and a stick lying on a frictionless surface. Suppose everything is the same as in the example except that the collision is perfectly inelastic so that the disk adheres to the stick at the endpoint at which it strikes. Find (a) the speed of the center of mass of the system and (b) the angular speed of the system after the collision.
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In Example 11.8, we investigated an elastic collision between a
disk and a stick lying on a frictionless surface. Suppose everything
is the same as in the example except that the collision is perfectly
inelastic so that the disk adheres to the stick at the endpoint at
which it strikes. Find (a) the speed of the center of mass of the
system and (b) the angular speed of the system after the collision.
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Wind
energy
is gaining increased attention, generating an
increased interest in windmill technology. Because
windmill blades (vanes) rotate about a central axis, one of
the most important physical properties of a windmill is its
moment of inertia.
Given is a picture of a typical windmill, where the
Center
of mass
geometry and center of mass of one of the vanes is
illustrated. The mass of each vane is 207 kg. The distance
from the center of mass of the vane to axis B is
k, = 2.45 m. The distance from the center of mass of the
vane to the center of the windmill hub is k,
= 3.80 m.
If the moment of inertia of a vane about axis A is
241 kg-m2 and about axis B is 5860 kg-m2, calculate the
moment of inertia Itotal of the entire assembly about the
axis that passes through the windmill's hub and is
perpendicular to the screen. (Ignore the hub and assume
the vanes are flat.)
I total
kg-m?
II
Chapter 11 Solutions
Physics for Scientists and Engineers
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