Physics for Scientists and Engineers with Modern Physics, Technology Update
9th Edition
ISBN: 9781305401969
Author: SERWAY, Raymond A.; Jewett, John W.
Publisher: Cengage Learning
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Chapter 3, Problem 29P
The helicopter view in Fig. P3.15 shows two people pulling on a stubborn mule. The person on the right pulls with a force
Figure P3.15
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The helicopter view in the figure shows two people pulling on a stubborn mule. The person on the right pulis with a force F, of magnitude 87.9 N
and direction of f₁ = 55.0%. The person on the left pulls with a force F, of magnitude 79.4 N and direction of U₂ = 65.0°
(a) Find the single force that is equivalent to the two forces shown. The forces are measured in units of newtons (symbolized N)
Ni+
Nj
(b) Find the force that a third person would have to exert on the mule to make the resultant force equal to zero.
Ni+
Nj
In a two-dimensional tug-of-war, Alex, Betty, and Charles pull horizontally on an automobile tire at the angles shown in the picture (the given
angle is 144°). The tire remains stationary in spite of the three pulls. Alex pulls with force FA of magnitude 210 N, and Charles pulls with force
c of magnitude 189 N. Note that the direction of Fc is not given. What is the magnitude of Betty's force Fg if Charles pulls in (a) the
direction drawn in the picture or (b) the other possible direction for equilibrium?
Alex
Charles
144°
Betty
Units
(a) Number
Units
(b) Number
areinn d-24 20
The helicopter view in the figure shows two people pulling on a stubborn mule. The person on the right pulls with a force F₁ of magnitude 110. N and direction of 0₁ = 55.0°. The person on the le
pulls with a force F₂ of magnitude 103.9 N and direction of ₂ = 60.0°.
F₁₂
0₂
F₁
0₁
(a) Find the single force that is equivalent to the two forces shown. The forces are measured in units of newtons (symbolized N).
115
X
Note that one of the forces pulls toward the left and one toward the right. What does this mean about the signs of the two x components? NÎ + 180.09
(b) Find the force that a third person would have to exert on the mule to make the resultant force equal to zero.
-115
X
These are the correct components of the third force using your incorrect values from part (a). NÎ + -180.09 ✓ NĴ
✓ Nĵ
Chapter 3 Solutions
Physics for Scientists and Engineers with Modern Physics, Technology Update
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