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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 = 433 N/m. Triceps muscle Biceps V muscle PHYSICS m, = 4.3 kg CG m. = 2.2 kg W. CG 4.0cm Wa 16 cm 38 cm (a) How much is the rope stretched (past equilibrium) to provide the same force w, 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.) 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 24° 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.)

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 = 433 N/m. Triceps muscle Biceps V muscle PHYSICS m, = 4.3 kg CG m. = 2.2 kg W. CG 4.0cm Wa 16 cm 38 cm (a) How much is the rope stretched (past equilibrium) to provide the same force w, 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.) 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 24° 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.)

Glencoe Physics: Principles and Problems, Student Edition
Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter8: Rotational Motion
Section: Chapter Questions
Problem 74A
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In the figure below, the biceps muscle exerts 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 constantk = 433 N/m. Triceps muscle Biceps V muscle PHYSICS m, = 4.3 kg CG m, = 2.2 kg CG Wa 38 cm (a) How much is the rope stretched (past equilibrium) to provide the same force w 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.) 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 24° 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.)
Transcribed Image Text:In the figure below, the biceps muscle exerts 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 constantk = 433 N/m. Triceps muscle Biceps V muscle PHYSICS m, = 4.3 kg CG m, = 2.2 kg CG Wa 38 cm (a) How much is the rope stretched (past equilibrium) to provide the same force w 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.) 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 24° 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.)
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