Bob is holding a pineapple in his left hand with his forearm 30 degrees from the...
- Bob is holding a pineapple in his left hand with his forearm 30
degrees from the horizontal (floor). Draw a free body diagram for
the forces and moments on his lower arm. Calculate external forces
and moments for this arm segment. Assume:
- The pineapple weighs 1 kg
- The pineapple’s weight is located at the center of mass of the hand
- Distance from the wrist to COM of hand = 0.07m
- Distance from the wrist to elbow = 0.28m
Homework Answers
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Bob is holding a pineapple in his left hand with his forearm 30
degrees from the...
2. Bill is holding a 12 kg barbell in his hand. His upper arm is perpendicular...
2. Bill is holding a 12 kg barbell in his hand. His upper arm is perpendicular to the ground, and his elbow is flexed to produce a 40º angle at the elbow joint. His forearm has a mass of 12 kg. The distance from the elbow joint to the weight in his hand is 35 cm. The center of mass (COM) of his forearm is located 14 cm from the elbow joint. Draw a free body diagram of this scenario....
Consider a person holding a bag like in the diagram, palm facing upwards, forearm parallel to...
Consider a person holding a bag like in the diagram, palm facing
upwards, forearm parallel to the floor, and upper arm making a
right angle with their forearm. Masses are added to the bag until
the subject can no longer comfortably keep the angle between their
upper arm and forearm at 90 degrees.
Weight of person: 170 lbs (756.5 N)
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Head( 7.3%), Hand(0.7%), Trunk(50.7%) Thigh(10.3%), Upper
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Calf(4.3%), (Forearm1.6%), Foot(1.5%)
The...
You are to assess the biomechanics of a male’s arm using his bicep to hold a...
You are to assess the biomechanics of a male’s arm using his bicep to hold a 20 kg object in his hand. The upper arm is perpendicular to the ground while the forearm is parallel to the ground. The male’s forearm is 26.5 cm long and weighs 1.42 kg. The man’s hand weighs 0.54 kg and is 19 cm long. The center of masses for the forearm and hand are 43% and 50% of the extremity lengths from the proximal...
2. A person is holding a weight (100 N) in their hand. The weight is a...
2. A person is holding a weight (100 N) in their hand. The weight is a distance of 0.3 meters from the center of rotation of the elbow. If the forearm is parallel to the ground, what is the torque about the elbow due to the weight? If the forearm has an angle of 30° above the horizontal (hand is higher than elbow), what is the torque about the elbow due to the weight? c. If an elbow flexor muscle...
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...
A man holds a 182-N ball in his hand, with the forearm horizontal (see the figure)....
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)....
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...
A man holds a 183-N ball in his hand, with the forearm horizontal (see the figure)....
A man holds a 183-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 Mn, which is applied perpendicular to the forearm. The forearm weighs 20.3 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...
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...
Consider the free-body diagram of a person holding a ball with their arm extended horizontally, as...
Consider the free-body diagram of a person holding a ball with their arm extended horizontally, as shown below on the left. The ball weighs WB 30 N, and is held at a distance d0.35 m from the elbow (E). The lower arm weighs WA 10N, with the center of mass distance 1- 0.15 m away from E. The biceps muscle applies a vertical upward force B to the lower arm at distance s - 0.03 m from E. a) What...
Consider a person holding a bag like in the diagram, palm facing
upwards, forearm parallel to the floor, and upper arm making a
right angle with their forearm. Masses are added to the bag until
the subject can no longer comfortably keep the angle between their
upper arm and forearm at 90 degrees.
Weight of person: 170 lbs (756.5 N)
Body Segment and Percentage Amount of Total Body Weight
Head( 7.3%), Hand(0.7%), Trunk(50.7%) Thigh(10.3%), Upper
Arm(2.6%)
Calf(4.3%), (Forearm1.6%), Foot(1.5%)
The...
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...
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...
A man holds a 183-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 Mn, which is applied perpendicular to the forearm. The forearm weighs 20.3 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...
Consider the free-body diagram of a person holding a ball with their arm extended horizontally, as shown below on the left. The ball weighs WB 30 N, and is held at a distance d0.35 m from the elbow (E). The lower arm weighs WA 10N, with the center of mass distance 1- 0.15 m away from E. The biceps muscle applies a vertical upward force B to the lower arm at distance s - 0.03 m from E. a) What...
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