When a person stands on tiptoe (a strenuous position),the position of the foot is as shown in Figure P8.24a. The totalgravitational force on the body, F, is supported by the forcen exerted by the floor on the toes of one foot. A mechanicalmodel of the situation is shown in Figure P8.24b, where T isthe force exerted by the Achilles tendon on the foot and R isthe force exerted by the tibia on the foot. Find the values of T,R, and 0 when F, = n = 700. N.-AchillestendonTibia15.0°18.0 cm25.0 cmFigure P8.24

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Answered: When a person stands on tiptoe (a…

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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A cook holds a 2.00-kg carton of milk at arm's length must be exerted by the biceps (Fig. P8.19). What force F muscle? (Ignore the weight of the forearm.) Milk 75.0° 25.0 cm 8.00 cm Figure P8.19
This a not graded assignment, it is a question on a practice exam. Please do question 7.
A 35 N forearm (we are ignoring the hand for this problem) are held at a 45 deg angle to the vertically oriented humerus. The COM of the forearm is located at a distance of 15 cm from the joint center at the elbow, and the elbow flexor muscles have a 3 cm moment arm. How much force must be exerted by the elbow flexor muscles to maintain this position? Hide answer choices A A 35 N C 81.7 N 123.7 N D 371 N Fm 45° * --Wt₂
The plank is a great way to strengthen abdominal, back, and shoulder muscles. You can also use this exercise position to locate your center of gravity. Holding plank position with a scale under his toes and another under his forearms, one athlete measured that 66.0% of his weight was supported by his forearms and 34.0% by his toes. (That is, the total normal forces on his forearms and toes were 0.660w and 0.340w, respectively, where w is the athlete’s weight.) He is 1.80 m tall, and in plank position the distance from his toes to the middle of his forearms is 1.53 m. How far from his toes is his center of gravity?
Figure P8.76 shows a clawhammeras it is being used to pull anail out of a horizontal board.If a force of magnitude 150 N isexerted horizontally as shown,find (a) the force exerted bythe hammer claws on the nailand (b) the force exerted bythe surface at the point of contactwith the hammer head.Assume that the force thehammer exerts on the nail isparallel to the nail and perpendicularto the position vector fromthe point of contact.
A 50 N hand and forearm are held at a 35° angle to the vertically oriented humerus. The CG of the forearm and hand is located at a distance of 12.5 cm from the joint center at the elbow, and the elbow flexor muscles attach at an average distance of 2.5 cm from the joint center. (Assume that the muscles attach at an angle of 35° to the forearm bones.) How much force must the forearm flexors exert if a 50 N weight is held in the hand at a distance along the arm of 25 cm?
A 50 N hand and forearm are held at a 35° angle to the vertically oriented humerus. The CG of the forearm and hand is located at a distance of 12.5 cm from the joint center at the elbow, and the elbow flexor muscles attach at an average distance of 2.5 cm from the joint center. (Assume that the muscles attach at an angle of 35° to the forearm bones.) How much force must be exerted by the forearm flexors to maintain this position?
Unlike most of the other muscles in our bodies, the masseter muscle in the jaw, as illustrated in as shown, is attached relatively far from the joint, enabling large forces to be exerted by the back teeth. (a) Using the information in the figure, calculate the force exerted by the lower teeth on the bullet. (b) Calculate the force on the joint.
When a gymnast weighing 740 N executes the iron cross as in figure (a), the primary muscles involved in supporting this position are the latissimus dorsi ("lats") and the pectoralis major ("pecs"). The rings exert an upward force on the arms and support the weight of the gymnast. The force exerted by the shoulder joint on the arm is labeled Fs while the two muscles exert a total force Fm on the arm. Determine the magnitude of the force Fm. Note that one ring supports half the weight of the gymnast, which is w = 370 N as indicated in figure (b). Assume that the force Fm acts at an angle of 45° below the horizontal at a distance of 4.0 cm from the shoulder joint. In your estimate, take the distance from the shoulder joint to the hand to be L = 71 cm and ignore the weight of the arm.
In exercise physiologystudies, it is sometimesimportant todetermine the location ofa person’s center of gravity.This can be done withthe arrangement shownin Figure P8.21. A lightplank rests on two scalesthat read Fg1 = 380. N andFg2 = 320. N. The scales are separated by a distance of 2.00 m.How far from the woman’s feet is her center of gravity?
A physics student is getting some physical education, specifically doing a pushup, sohe’s supported by his feet and by his hands directly below his shoulders. At the bottomof the pushup, when his body is level, his center of mass is 39 cm from his shoulders and99 cm from his feet, and his mass is 75 kg. Find the force on his hands and the force onhis feet.
The biceps muscle exerts a muscle force of 1000N on the forearm, as per below. The muscle force acts at an angle of 30deg to the forearm. How large are the horizontal and vertical components of this force that holds the forearm in place?

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