BIO Tendons . Tendons are strong elastic fibers that attach muscles to hones. To a reasonable approximation, they obey Hooke’s law. In laboratory tests on a particular tendon, it was found that, when a 250-g object was hung from it, the tendon stretched 1.23 cm. (a) Find the force constant of this tendon in N/m. (b) Because of its thickness, the maximum tension this tendon can support without rupturing is 138 N. By how much can the tendon stretch without rupturing and how much energy is stored in it at that point?
BIO Tendons . Tendons are strong elastic fibers that attach muscles to hones. To a reasonable approximation, they obey Hooke’s law. In laboratory tests on a particular tendon, it was found that, when a 250-g object was hung from it, the tendon stretched 1.23 cm. (a) Find the force constant of this tendon in N/m. (b) Because of its thickness, the maximum tension this tendon can support without rupturing is 138 N. By how much can the tendon stretch without rupturing and how much energy is stored in it at that point?
BIO Tendons. Tendons are strong elastic fibers that attach muscles to hones. To a reasonable approximation, they obey Hooke’s law. In laboratory tests on a particular tendon, it was found that, when a 250-g object was hung from it, the tendon stretched 1.23 cm. (a) Find the force constant of this tendon in N/m. (b) Because of its thickness, the maximum tension this tendon can support without rupturing is 138 N. By how much can the tendon stretch without rupturing and how much energy is stored in it at that point?
Tendons. Tendons are strong elastic fibers that attach muscles to bones. To a reasonable approximation, they obey Hooke’s law. In laboratory tests on a particular tendon, it was found that, when a 248-g object was hung from it, the tendon stretched 1.22 cm. (a) Find the force constant of this tendon in N/m. (b) Because of its thickness, the maximum tension this tendon can support without rupturing is 140 N. By how much can the tendon stretch without rupturing, and how much energy is stored in it at that point? Draw free-body diagram.
A spring of unstreched length 25 cm is pulled in a horizontal direction with 150 N
force. Since we apply a force in a horizontal direction, the spring is stretched to 28
cm.
Now we suspend the spring from a hook in a vertical direction and attached a 15 kg
mass at the bottom.
How long my spring will stretch?
Many caterpillars construct cocoons from silk, one of the strongest naturally occurring materials known. Each thread is typically
2.0 µm in diameter, and the silk has a Young's modulus of 4.0 x 10° N/m2.
Assuming that there is no appreciable space between the
parallel strands, how many strands N would be needed to
strands
N =
make a rope 8.2 m long that would stretch only 1.02 cm when
supporting a pair of 83-kg mountain climbers?
Again assuming that there is no appreciable space between the
cm
parallel strands, what would be the diameter d of the rope?
d =
Chapter 7 Solutions
University Physics with Modern Physics Plus Mastering Physics with eText -- Access Card Package (14th Edition)
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