College Physics: A Strategic Approach (3rd Edition)
3rd Edition
ISBN: 9780321879721
Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher: PEARSON
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Textbook Question
Chapter P.1, Problem 18P
Bending Beams
If you bend a rod down, it compresses the lower side of the rod and stretches the top, resulting in a restoring force. Figure I.4 shows a
FIGURE 1.4
beam of length L, width w, and thickness t fixed at one end and free to move at the other. Deflecting the end of the beam causes a restoring force F at the end of the beam. The magnitude of the restoring force F depends on the dimensions of the beam, the Young’s modulus Y for the material, and the deflection d. For small values of the deflection, the restoring force is
This is similar to the formula for the restoring force of a spring, with the quantity in brackets playing the role of the spring constant k.
When a 70 kg man stands on the end of a springboard (a type of diving board), the board deflects by 4.0 cm.
A 70 kg man jumps up and lands on the end of the board, deflecting it by 12 cm. At this instant, what is the approximate magnitude of the upward force the board exerts on his feet? A. 700 A. 700 N
B. 1400 N
C. 2100N
D. 2800 N
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F,
F2,
Problem 2.
Three 10-N forces act on a beam as shown to the right.
a. Calculate the torque produced by force 1 about point P.
b. Calculate the torque produced by force 2 about point P.
c. Calculate the torque produced by force 3 about point P.
d. Calculate the net torque about point P.
60°
F3
0.5 m
0.5 m
0.5 m
F2,
Problem 2.
Three 10-N forces act on a beam as shown to the right.
a. Calculate the torque produced by force 1 about point P.
b. Calculate the torque produced by force 2 about point P.
c. Calculate the torque produced by force 3 about point P.
d. Calculate the net torque about point P.
60°
0.5 m
0.5m
0.5 m
Which of the following statements
are true? Select all correct. If none
correct, enter N.
A.
B. The lever arm is the distance
between the point where a force is
applied and the axis of rotation.
C. The vector r points from the point
where the force is applied to the
axis of rotation.
D. Torque has units of N.
E. If vectors r and F are parallel, the
torque is largest.
F. If you point your fingers along F and
curl them in the direction of the
vector r, your thumb points in the
direction of the torque.
G. The magnitude of torque depends
on what axis of rotation you choose.
Chapter P Solutions
College Physics: A Strategic Approach (3rd Edition)
Ch. P.1 - Prob. 1PCh. P.1 - The following questions are related to the passage...Ch. P.1 - The following questions are related to the passage...Ch. P.1 - Prob. 4PCh. P.1 - Animal Athletes Different animals have very...Ch. P.1 - Animal Athletes Different animals have very...Ch. P.1 - Animal Athletes Different animals have very...Ch. P.1 - Animal Athletes Different animals have very...Ch. P.1 - Animal Athletes Different animals have very...Ch. P.1 - The drag force on an object moving in a liquid is...
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P.4 - Waves in the Earth and the Ocean In December 2004,...Ch. P.4 - Waves in the Earth and the Ocean In December 2004,...Ch. P.4 - Prob. 6PCh. P.4 - Prob. 7PCh. P.4 - Prob. 8PCh. P.4 - Prob. 9PCh. P.4 - Prob. 10PCh. P.4 - Prob. 11PCh. P.4 - Prob. 12PCh. P.4 - Prob. 13PCh. P.4 - Prob. 14PCh. P.4 - Prob. 15PCh. P.4 - Prob. 16PCh. P.4 - In the Swing A rope swing is hung from a tree...Ch. P.4 - In the Swing A rope swing is hung from a tree...Ch. P.4 - In the Swing A rope swing is hung from a tree...Ch. P.4 - Additional Integrated Problems The jumping gait of...Ch. P.4 - Prob. 21PCh. P.5 - Scanning Confocal Microscopy Although modern...Ch. P.5 - If, because of a poor-quality objective, the light...Ch. P.5 - The resolution of a scanning confocal microscope...Ch. P.5 - Prob. 4PCh. P.5 - In a horses eye, the image of a close object will...Ch. P.5 - Prob. 6PCh. P.5 - A horse is looking straight ahead at a person who...Ch. P.5 - Prob. 8PCh. P.5 - Light of wavelength 600 nm in air passes into the...Ch. P.5 - Prob. 10PCh. P.5 - Prob. 11PCh. P.5 - 12. In human vision, the curvature of the cornea...Ch. P.5 - Prob. 13PCh. P.5 - 14. Figure V.2c shows the lens of the eye bringing...Ch. P.5 - The pupil of your eye is smaller in bright light...Ch. P.5 - People with good vision can make out an...Ch. P.5 - Prob. 17PCh. P.5 - Prob. 18PCh. P.6 - The Greenhouse Effect and Global Warming...Ch. P.6 - The Greenhouse Effect and Global Warming...Ch. P.6 - The Greenhouse Effect and Global Warming...Ch. P.6 - The Greenhouse Effect and Global Warming...Ch. P.6 - The Greenhouse Effect and Global Warming...Ch. P.6 - Prob. 6PCh. P.6 - Prob. 7PCh. P.6 - The following passages and associated questions...Ch. P.6 - Prob. 9PCh. P.6 - Prob. 10PCh. P.6 - Prob. 11PCh. P.6 - Electric Cars In recent years, practical hybrid...Ch. P.6 - Electric Cars In recent years, practical hybrid...Ch. P.6 - Electric Cars In recent years, practical hybrid...Ch. P.6 - Electric Cars In recent years, practical hybrid...Ch. P.6 - Wireless Power Transmission Your laptop has...Ch. P.6 - Wireless Power Transmission Your laptop has...Ch. P.6 - Wireless Power Transmission Your laptop has...Ch. P.6 - Wireless Power Transmission Your laptop has...Ch. P.6 - Additional Integrated Problems 20. A 20 resistor...Ch. P.6 - Prob. 21PCh. P.7 - Prob. 1PCh. P.7 - Prob. 2PCh. P.7 - Prob. 3PCh. P.7 - Prob. 4PCh. P.7 - Prob. 5PCh. P.7 - Prob. 6PCh. P.7 - Prob. 7PCh. P.7 - Prob. 8PCh. P.7 - Prob. 9PCh. P.7 - Prob. 10PCh. P.7 - Prob. 11PCh. P.7 - Prob. 12PCh. P.7 - Prob. 13PCh. P.7 - Prob. 14PCh. P.7 - Prob. 15PCh. P.7 - Prob. 16PCh. P.7 - Prob. 17PCh. P.7 - Prob. 18PCh. P.7 - Many speculative plans for spaceships capable of...Ch. P.7 - A muon is a lepton that is a higher-mass (rest...Ch. P.7 - A muon is a lepton that is a higher-mass (rest...
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