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**Unformatted text preview: **5.123: a) See Exercise 5.38; F = k w (cos + k sin ). b) c) The expression for F is a minimum when the denominator is a maximum; the calculus is identical to that of Problem 5.77 (maximizing w for a given F gives the same result as minimizing F for a given w), and so F is minimized at tan = k . For k = 0.25, = 14.0, keeping an extra figure. ...

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