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 B с D 35 N 81.7 N 123.7 N 371 N Fm 45°

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 B с D 35 N 81.7 N 123.7 N 371 N Fm 45°

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter14: Static Equilibrium, Elasticity, And Fracture

Section: Chapter Questions

Problem 21PQ

See similar textbooks

Similar questions

What three factors affect the torque created by a force relative to a specific pivot point?
A person places his hand palm downward on a scale and pushes down on the scale until it reads 96.0 N. The triceps muscle is responsible for this arm extension force. Find the force exerted by the triceps muscle. The bottom of the triceps muscle is 2.50 cm to the left of the elbow joint, and the palm is pushing at approximately 29.0 cm to the right of the elbow joint. P 96.0 N 2.50 cm and Q = 29.0 cm. where P =
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?
Where is the center of gravity of a ring? The biceps muscle exerts a vertical force of 7090 N on the lower arm. Calculate a. The torque about the axis of rotation through the elbow joint if the biceps and lower arm are perpendicular to each other b. If the lower arm is ° lower with respect to the horizontal. Assume that the muscle is attached 5.0 cm from the elbow.
The young tree, originally bent, has been brought into the vertical position by adjusting the three guy-wire tensions to AB = 5 lb, AC = 11 lb, and AD = 15 lb. Determine the force and moment reactions at the trunk base point O. Neglect the weight of the tree. 5.2' 2.9' 5.8' y 2.9' 5.8' Answers: Fo = ( i i+ i j+ i k) Ib Mo = ( i i+ i j+ i k) Ib-ft
The arm in Figure P8.17 weighs 41.5 N. The force of gravity acting on the arm acts through point A. Determine the magnitudes of the tension force F, in the deltoid muscle and the force F, exerted by the shoulder on the humerus (upper- arm bone) to hold the arm in the position shown. F, 12° F, '0.080 m -0.290 m Figure P8.17
The forearm of length Larm = 35.6 cm shown in the figure is positioned at an angle with respect to the upper arm, and a 4.85-kg ball is held in the hand. The total mass mtotal of the forearm and hand is 2.85 kg, and their center of mass is located at LCM = 14.4 cm from the elbow. The biceps muscle attaches to the forearm at a distance Lbiceps = 3.5 cm from the elbow. What is the magnitude of the force Fbiceps that the biceps muscle exerts on the forearm for 0 = 39°? Fbiceps = What is the magnitude of the force Fjoint that the forearm exerts on the elbow joint for 0 = 39°? Fjoint = N N T biceps 0 arm
The parts of the cabin and the engine of the shovel are articulated by a vertical pin located 1.50m in the wheels of the front wheels. The distance from Ce D is 0.75m. The center of gravity of the engine part, which weighs 300 kN, is point Gm. The center of center of the cabin part, which weighs 100 kN, is point Gc. Determine the internal forces (axial force, shear force, and bending moment) at point j of the indicated structure. The 75kN force has been removedTemplate: (In Jd) F=0 N; M=15 Nm; V = 100 N
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?
Ob. OC L Select one Od 185.m N CW Od 1|2 Img 289. m N CCW 185. m N CCW 289. m N CW A ladder is leaning against a wall as shown on the left. The mass of the ladder is 17.5 kg. The length of the ladder is 4.00 m. The mass is uniformly distributed along the length of the ladder, so its center of mass is at the geometric center of the ladder or at half its length as shown. The angle between the ladder and the floor is 0 = 32.7°. What is the magnitude and direction of the torque created by the mass of the ladder about a pivot point which is the point at which the ladder is touching the floor (a circle is on drawing to indicate the pivot point?
A 0.140 kg, 42.1-cm-long uniform bar has a small 0.055 kg mass glued to its left end and a small 0.150 kg mass glued to the other end. The two small masses can each be treated as point masses. You want to balance this system horizontally on a fulcrum placed just under its center of gravity. How far from the left end should the fulcrum be placed?