EBK PHYSICS
5th Edition
ISBN: 8220103026918
Author: Walker
Publisher: PEARSON
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Chapter 8, Problem 62GP
BIO Bird Tendons Several studies indicate that the elastic properties of tendons can change in response to exercise. In one study guinea fowl were divided into a group that ran for 30 minutes a day on a treadmill, and a control group that was kept in their cages. After 12 weeks, the researchers measured the mechanical properties of the gastrocnemius tendon in each bird. The results for one control bird and one treadmill bird are shown in Figure 8-39. (a) Treating the tendon as an ideal spring, what is the force constant for the control bird? (b) By how much does the control bird’s tendon need to be stretched in order to have the same amount of stored energy as the tendon of the treadmill bird at a deformation of 1.0 mm?
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Explain if it is possible for a system to have negative potential energy
Part A
Scallops use muscles to close their shells. Opening the
shell is another story--muscles can only pull, they can't
push. Instead of muscles, the shell is opened by a spring,
a pad of a very elastic biological material called abductin.
When the shell closes, the pad compresses; a restoring
force then pushes the shell back open. The energy to
How much elastic potential energy is stored?
Express your answer with the appropriate units.
open the shell comes from the elastic energy that was
stored when the shell was closed. (Figure 1) shows
HA
?
smoothed data for the restoring force of an abductin pad
versus the compression. When the shell closes, the pad
compresses by 0.15 mm.
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Restoring force (N)
2.5 -
2.0
1.5
1.0
0.5
0.05 0.10 0.15 0.20
Compression (mm)
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Chapter 8 Solutions
EBK PHYSICS
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