Problem 004 Referring to Fig. 1.4, determine the angle between vector A and the y-axis. A. 65.7° B. 73.1° C. 67.5° D. 71.3°
Solution 004
$A_{xy} = 0.5A$
$A_y = A_{xy} \sin 40^\circ$
$A_y = (0.5A) \sin 40^\circ$
$A_y = 0.321A$
$\cos \theta_y = 0.321$
$\theta_y = 71.3^\circ$
Answer: D
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