Concept explainers
The same vectors that are shown in Figure P3.6 are shown in Figure P3.42. The magnitudes are F1 = 1.90f, F2 = f, and F3 = 1.4f, where f is a constant.
a. Use the coordinate system shown in Figure P3.42 to find
b. If Rx = 0.33, what is Ry?
c. Check your result by comparing your answer to that of Problem 6.
FIGURE P3.42
(a)
The component form of
Answer to Problem 42PQ
The component form of
Explanation of Solution
Here,
The force
Conclusion:
Substitute,
Therefore, the component form of
(b)
The value of
Answer to Problem 42PQ
The value of
Explanation of Solution
Given that
But from part (a) it is obtained that
Rearrange equation (II) to obtain expression for
Compare the two values of
Conclusion:
From equation (III) find the value of
Substitute,
Therefore, the value of
(c)
Compare result with the one obtained for problem 6.
Answer to Problem 42PQ
Result is consistent with those obtained for problem 6.
Explanation of Solution
The resultant vector is in fourth quadrant, and magnitude is small compared to the length of individual vectors.
Therefore, the results of both problems are consistent.
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Chapter 3 Solutions
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