Physics
7th Edition
ISBN: 9780321625915
Author: Douglas C. Giancoli
Publisher: PEARSON
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Chapter 8, Problem 91GP
A large spool of rope rolls on the ground with the end of the rope lying on the top edge of the spool. A person grabs the end of the rope and walks a distance f, holding onto it, Fig. 8-64. The spool rolls behind the person without slipping. What length of rope unwinds from the spool? How far does the spool's center of mass move?
Figure 8-64
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A large spool of rope rolls on the ground with the end of
the rope lying on the top edge of the spool. A person grabs
the end of the rope and walks a distance l, holding onto it,
Fig. 8-64. The spool rolls behind the person
without slipping. What length of rope unwinds
from the spool? How far
does the spool's center of
mass move?
FIGURE 8-64
Problem 91.
The object shown in Figure 8-72 is made from two solid disks: m1=23kg, m2 = 39kg, r1 = 17cm, and r2=33cm. The disks are connected by a thin rod of mass M = 11.0 kg and length L = 67.0 cm. The object is held in a horizontal position and then let go. The object is free to rotate about a pivot through the centre of mass of the larger disk. Find the speed of the centre of mass of the smaller disk when it has swung 90° from its original position.
A solid disk with a mass of 32 kg and a radius of 27 cm is spinning counter-clockwise at 17 rad/s in the horizontal plane about its axis of symmetry. Another disk with half the mass and half the radius is spinning at 34 rad/s in the opposite direction when it drops onto the first disk, as shown in Figure 8-75.Find the final angular speed of the two disks when they eventually spin together.
Chapter 8 Solutions
Physics
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