Find the elbow joint reaction force (magnitude and direction) and the elbow flexor muscle force for...
Find the elbow joint reaction force (magnitude and direction) and the elbow flexor muscle force for the instant described below. Assume the forearm, hand, and ball to be a single rigid body. This rigid body has a mass of 3 kg; it has a mass moment of inertia about its center of mass of 0.018 kg*m2 ; its center of mass is 19 cm from the center of the elbow joint. The rigid body has an angular acceleration (α) of 37 rad/s2 in the counter-clockwise direction; the center of mass has accelerations of ax = -7 m/s2 and ay = 7 m/s2 . The elbow flexor muscles are assumed to act along a single line of action that forms a 70 degree angle with the horizontal, with a moment arm of 5 cm from the joint center.
Segment % of Bodyweight Length (% hieght) CM location from proximal (% total length) Radius of gyration about CM (% total length)
Hand 0.6 11 51 30
Forearm 1.5 15 43 30
Upper arm 2.8 19 44 32
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Find the elbow joint reaction force (magnitude and direction)
and the elbow flexor muscle force for...
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...
Dan's biceps muscle has a moment arm about the elbow joint of 0.011 m when the...
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2. Bill is holding a 12 kg barbell in his hand. His upper arm is perpendicular...
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A man holds a 182-N ball in his hand, with the forearm horizontal (see the figure)....
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A man holds a 194-N ball in his hand, with the forearm horizontal (see the figure)....
A man holds a 194-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 18.5 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...
and its centre of mass is located 1o cm from the elbow as illustrated. The single...
and its centre of mass is located 1o cm from the elbow as illustrated. The single muscle equivalent flexor force acts 5 cm from the elb are acting, what would be required to keep the segment positioned 20 from the horizontal? Remember, a complete free body diagram is always considered an integral part of a statics solution. D1. The forearm (including the hand) segment has a mass of 3 kg ow joint. Assuming no other muscular forces F pulling at...
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
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How much force (in N) must the biceps muscle exert when a 25.0 kg mass is...
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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...
A man holds a 182-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 19.3 N and has a center of gravity as indicated. Find (a) the magnitude of and the (b) magnitude and (c) direction (as a positive angle counterclockwise from horizontal) of the force applied by the upper arm bone to...
A man holds a 194-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 18.5 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...
and its centre of mass is located 1o cm from the elbow as illustrated. The single muscle equivalent flexor force acts 5 cm from the elb are acting, what would be required to keep the segment positioned 20 from the horizontal? Remember, a complete free body diagram is always considered an integral part of a statics solution. D1. The forearm (including the hand) segment has a mass of 3 kg ow joint. Assuming no other muscular forces F pulling at...
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...
QUESTION 2 The drawing shows a person mass-59 kg. doing push-ups. Find the force exerted by the floor on each foot, assuming that the person holds this position. Express your answer is Sl units with 3 or more significant figures 0.90 m 1.50 m QUESTION 3 A uniform lunch tray is being held in one hand, as the drawing illustrates. The mass of the tray is 0.11 kg. On the tray is a 1 kg plate of food and a...
How much force (in N) must the biceps muscle exert when a 25.0 kg mass is held in the hand in a stationary position when the arm is 17.4° below the horizontal? Assume the mass of the forearm is 2.46 kg. Distances relative to the elbow joint are reb = 5.12 cm; recg = 16.5 cm; ren = 37.5 cm where the distances are: eb = elbow—biceps; ecg = elbow—forearm center of gravity; eh = elbow-hand. A marble column 0.890...
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