In a study of the biomechanics of thetug-of-war, a 2.0-m-tall, 80.0 kg competitor in the middle of the line isconsidered to be a rigid body leaning back at an angle of 30.0° to the vertical. The competitor is pulling ona rope that is held horizontal a distanceof 1.5 m from his feet (as measuredalong the line of the body). Atthe moment shown in the figure, theman is stationary and the tension in therope in front of him is T1 = 1160 N.Since there is friction between therope and his hands, the tension in therope behind him, T2, is not equal to T1.His center of mass is halfway betweenhis feet and the top of his head. Thecoefficient of static friction betweenhis feet and the ground is 0.65. His body is leaning back at 30.0° to the vertical, but the coefficient of static friction between his feet and the ground is suddenly reduced to 0.50. What will happen? (a) His entire body will accelerate forward; (b) his feet will slip forward; (c) his feet will slip backward; (d) his feet will not slip.
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. His body is leaning back at 30.0° to the vertical, but the coefficient
of static friction between his feet and the ground is suddenly reduced to
0.50. What will happen? (a) His entire body will accelerate forward; (b) his
feet will slip forward; (c) his feet will slip backward; (d) his feet will not slip.
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