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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