A patient rests their hand on a scale 31 cm anterior from the joint center at...
A patient rests their hand on a scale 31 cm anterior from the joint center at the
elbow. The weight of the forearm and hand is 44 N with the hand/forearm Center
of Gravity located 18 cm from the elbow joint center. The reading on the scale is
30 N. Draw a Net torque free body diagram that will allow you to determine
whether the biceps (elbow flexors) or triceps (elbow extensors) are active.
b) Calculate the torque produced by the agonist muscle.
c) Which muscle group is the agonist?
Homework Answers
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A patient rests their hand on a scale 31 cm anterior from the
joint center at...
11. A 40 newton hand and forearm are held at 90 degrees, the center of gravity...
11. A 40 newton hand and forearm are held at 90 degrees, the center of gravity of the forearm is 15 cm from the elbow joint center. Assume the tendon of the biceps muscle attaches at a 90 degree angle to the forearm at a point 4 cm form the elbow joint center. How much force must the biceps muscle produce to maintain this position? Hint: use net torque to solve. (5 points) Tm = F. Xd Center of rotation
The diagram above shows a side view of a person’s arm. The forearm and hand together...
The diagram above shows a side view of a person’s arm. The
forearm and hand together weigh 19N (WFH = 19N). The
center of gravity at point T is located 24cm from
the elbow joint. The person is holding a bowling ball 38cm from the
elbow and the ball weighs 47N (WB = 47N).
(a) Calculate the torque produced by the weight of the forearm
and hand about the elbow joint. Include the direction of the
torque.
(b) Calculate the...
The figure below shows an arm that is balancing a carton of milk in the hand....
The figure below shows an arm that is balancing a carton of milk in the hand. The mass of the carton of milk is 1.08 kg, and in the figure is the gravitational force on the carton The biceps muscle applies a force F, to the forearm directed up and to the right at an angle of 75.0" from vertical. The point where is applied to the forearm is 8.00 cm to the left of the elbow joint and 25.0...
Constants A 71.0 kg weight lifter is doing arm raises using a 7.50 kg weight in...
Constants A 71.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0 below the horizontal. (See the figure(Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 6.40 % of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the elbow...
Dan's biceps muscle has a moment arm about the elbow joint of 0.011 m when the...
Dan's biceps muscle has a moment arm about the elbow joint of 0.011 m when the joint is held at a joint angle of 90 degrees and can produce a force of 526 N. His forearm is 0.24 m from the elbow joint center to the center of his hand where he grips a handle. His forearm has a mass of 1.2 kg and the center of mass is located directly above the elbow joint. How much force can he...
A 75.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her...
A 75.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0 below the horizontal. (See the figure (Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 5.75% of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the elbow Part...
A 200 N weight is held by a student's hand with the forearm horizontal.
A 200 N weight is held by a student's hand with the forearm horizontal. The biceps muscle is located at 30 cm from the joint, and the weight is 80 cm from the joint. Find the upward force in Newtons exerted by the biceps on the forearm? Ignore the weight of the forearm. 280 310 533 More information needed
An athlete is measuring the force by their flexor muscle by pulling a rope horizontally at...
An athlete is measuring the force by their flexor muscle by pulling a rope horizontally at a constant force. While pulling the rope the muscle applies a force on the forearm an angle of 71° as shown in the diagram. While keeping your forearm completely vertical, the tension in the rope is at 185N. The athlete's muscle is attached to the forearm 5 cm from the elbow joint and that the weight of your forearm is 22 N with a...
Bone at 0.04 m from the center of rotation at the elbow joint, to statically support a dumbbell o...
bone at 0.04 m from the center of rotation at the elbow joint, to statically support a dumbbell of 100 N held in the hand at a distance of 0.25 m from the elbow joint, with the forearm held at an angle of 45 from vertical (see diagram below)? The forearm-hand system has a mass of 2.9 kg with a COG 0.14 m from the elbow joint. (Neglect any action of other muscles). Hint: Round intermediate values to 4 decimal...
Consider the case of the bicepts muscle acting on a forearm holding a 43 N weight....
Consider the case of the bicepts muscle acting on a forearm
holding a 43 N weight. The forearm is 30° below the horizontal and
the bicepts muscle inserts at an angle of 45° with the forearm. The
muscle insertion is at 5 cm from the elbow joint. The forearm has a
weight of 21 N and has its center of gravity 15 cm from the elbow.
The 43 N weight is held in the hand 30 cm from the joint...
11. A 40 newton hand and forearm are held at 90 degrees, the center of gravity of the forearm is 15 cm from the elbow joint center. Assume the tendon of the biceps muscle attaches at a 90 degree angle to the forearm at a point 4 cm form the elbow joint center. How much force must the biceps muscle produce to maintain this position? Hint: use net torque to solve. (5 points) Tm = F. Xd Center of rotation
The diagram above shows a side view of a person’s arm. The
forearm and hand together weigh 19N (WFH = 19N). The
center of gravity at point T is located 24cm from
the elbow joint. The person is holding a bowling ball 38cm from the
elbow and the ball weighs 47N (WB = 47N).
(a) Calculate the torque produced by the weight of the forearm
and hand about the elbow joint. Include the direction of the
torque.
(b) Calculate the...
The figure below shows an arm that is balancing a carton of milk in the hand. The mass of the carton of milk is 1.08 kg, and in the figure is the gravitational force on the carton The biceps muscle applies a force F, to the forearm directed up and to the right at an angle of 75.0" from vertical. The point where is applied to the forearm is 8.00 cm to the left of the elbow joint and 25.0...
Constants A 71.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0 below the horizontal. (See the figure(Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 6.40 % of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the elbow...
A 75.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0 below the horizontal. (See the figure (Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 5.75% of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the elbow Part...
An athlete is measuring the force by their flexor muscle by pulling a rope horizontally at a constant force. While pulling the rope the muscle applies a force on the forearm an angle of 71° as shown in the diagram. While keeping your forearm completely vertical, the tension in the rope is at 185N. The athlete's muscle is attached to the forearm 5 cm from the elbow joint and that the weight of your forearm is 22 N with a...
bone at 0.04 m from the center of rotation at the elbow joint, to statically support a dumbbell of 100 N held in the hand at a distance of 0.25 m from the elbow joint, with the forearm held at an angle of 45 from vertical (see diagram below)? The forearm-hand system has a mass of 2.9 kg with a COG 0.14 m from the elbow joint. (Neglect any action of other muscles). Hint: Round intermediate values to 4 decimal...
Consider the case of the bicepts muscle acting on a forearm
holding a 43 N weight. The forearm is 30° below the horizontal and
the bicepts muscle inserts at an angle of 45° with the forearm. The
muscle insertion is at 5 cm from the elbow joint. The forearm has a
weight of 21 N and has its center of gravity 15 cm from the elbow.
The 43 N weight is held in the hand 30 cm from the joint...
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