Problem 2.5

Force [b]F[/b] of magnitude 500 lb is to be resolved into two components along lines [i]a-a[/i] and [i]b-b[/i]. Determine by trigonometry angle α knowing that the component of [b]F[/b] along line [i]a-a[/i] is to be 400 lb.
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– William Haynes

Information: Problem 2.5