BIO TORQUES AND TUG-OF-WAR. In a study of the biomechanics of the tug-of-war, a 2.0-m-tall, 80.0-kg competitor in the middle of the line is considered to be a rigid body leaning back at an angle of 30.0° to the vertical. The competitor is pulling on a rope that is held horizontal a distance of 1.5 m from his feet (as measured along the line of the body). At the moment shown in the figure, the man is stationary and the tension in the rope in front of him is T 1 = 1160 N. Since there is friction between the rope and his hands, the tension in the rope behind him, T 2, is not equal to T 1 . His center of mass is halfway between his feet and the top of his head. The coefficient of static friction between his feet and the ground is 0.65. 11.92 What is tension T 2 in the rope behind him? (a) 590 N; (b) 650 N; (c) 860 N;(d) 1100 N.N.
BIO TORQUES AND TUG-OF-WAR. In a study of the biomechanics of the tug-of-war, a 2.0-m-tall, 80.0-kg competitor in the middle of the line is considered to be a rigid body leaning back at an angle of 30.0° to the vertical. The competitor is pulling on a rope that is held horizontal a distance of 1.5 m from his feet (as measured along the line of the body). At the moment shown in the figure, the man is stationary and the tension in the rope in front of him is T 1 = 1160 N. Since there is friction between the rope and his hands, the tension in the rope behind him, T 2, is not equal to T 1 . His center of mass is halfway between his feet and the top of his head. The coefficient of static friction between his feet and the ground is 0.65. 11.92 What is tension T 2 in the rope behind him? (a) 590 N; (b) 650 N; (c) 860 N;(d) 1100 N.N.
BIO TORQUES AND TUG-OF-WAR. In a study of the biomechanics of the tug-of-war, a 2.0-m-tall, 80.0-kg competitor in the middle of the line is considered to be a rigid body leaning back at an angle of 30.0° to the vertical. The competitor is pulling on a rope that is held horizontal a distance of 1.5 m from his feet (as measured along the line of the body). At the moment shown in the figure, the man is stationary and the tension in the rope in front of him is T1 = 1160 N. Since there is friction between the rope and his hands, the tension in the rope behind him, T2, is not equal to T1. His center of mass is halfway between his feet and the top of his head. The coefficient of static friction between his feet and the ground is 0.65.
11.92 What is tension T2 in the rope behind him? (a) 590 N; (b) 650 N; (c) 860 N;(d) 1100 N.N.
- The drawing shows a lower leg being exercised. It has a 49-N
weight attached to the foot and is extended at an angle 0 with
respect to the vertical. Consider a rotational axis at the knee. (a) When
0 = 90.0°, find the magnitude of the torque that the weight creates. (b) At
what angle 0 does the magnitude of the torque equal 15 N · m?
69.
Axis
0.55 m
49 N
The fishing pole (See attachment) makes an angle of 20.0 degrees with the horizontal. What is the magnitude of the torque exerted by the fish about an axis perpendicular to the page and passing through the angler's hand if the fish pulls on the fishing line with a force F = 100N at an angle 37.0 degrees below the horizontal? The force is applied at a point 2.00m from the angler's hands.
A man holds a 195-N ball in his hand, with the forearm horizontal (see the figure). He can support the ball in this position because of
the flexor muscle force M , which is applied perpendicular to the forearm. The forearm weighs 20.7 N and has a center of gravity as
indicated. Find (a) the magnitude of M and the (b) magnitude and (c) direction (as a positive angle counterclockwise from
horizontal) of the force applied by the upper arm bone to the forearm at the elbow joint.
Upper
arm bone-
Flexor muscle
M
Elbow
cg
joint
0.0510 m+
0.0890 m
-0.330 m-
(a) Number
i
Units
(b) Number
i
Units
(c) Number
i
Units
>
Chapter 11 Solutions
University Physics with Modern Physics (14th Edition)
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
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