In the figure below, the biceps muscle exerts a force supporting a perpendicular forearm and a book. Suppose we replace the book with an elastic exercise rope that obeys Hooke's Law. Assume its force constant $k = 733 \text{ N/m}$. (a) How much is the rope stretched (past equilibrium) to provide the same force $w_b$ as before the book was replaced? Assume the rope is held in the hand at the same location as the book. (Enter your answer in cm.) (b) What force (in N) is on the biceps muscle if the exercise rope is pulled straight up so that the forearm makes an angle of $18^\circ$ with the horizontal? Assume the biceps muscle is still perpendicular to the forearm. (Assume the same stretch in the rope as part (a). Enter the magnitude)
Added by Marta R.
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