Torque and the Two Conditions for Equilibrium 17. 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 → t , in the deltoid muscle and the force F → s exerted by the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown. Figure P8.17
Torque and the Two Conditions for Equilibrium 17. 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 → t , in the deltoid muscle and the force F → s exerted by the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown. Figure P8.17
17. 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
→
t
, in the deltoid muscle and the force
F
→
s
exerted by the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown.
Amaris is doing a knee extension exercise using a 100 N weight strapped to her ankle 40 cm from her knee joint. She holds her leg so that the horizontal distance from her knee joint to the weight is 30 cm.
a. For this position, what torque is created by the weight about her knee joint axis?
b. If the moment arm of the knee extensor muscles is 4 cm about the knee joint axis, what amount of force must these muscles produce to hold the leg in the position described? Ignore the weight of the leg.
What are the magnitude and the
direction of net torque about point O for
the two forces applied as in figure in
units of N-m. The rod and both forces
are in the xy-plane.
F =
= 8.00 N
F2 = 12.0 N
30.0°
K2.00 m*
3.00 m
Select one:
A. 16, +y direction
B. 12.2, +z direction
C. 16, -z direction
D. 16, -y direction
E. 28, -y direction
F. 28, -z direction
G. 16, +z direction
H. 28, +z direction
As a swimmer pulls his arm through the water, various muscles exert forces on the upper arm. The figure below shows a force F exerted on the humerus (upper arm bone) by the pectoral muscle. The muscle is connected to the bone d = 7.30 cm from the center point O of the shoulder joint. Find the magnitude of F, if this force's torque on the arm provides half of the total torque balancing the torque produced by the water pushing against the hand. (Let Fhand = 119and D = 33.0 cm. )
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