a
man is holding a 2.80kg ball as shown in the figure. the distance
from the elbow joint to the ball is dball=28.5cm and the distance
from the elbow joint to the insertion of the triceps muscle is
dm=2cm. The mass of the lower arm, including the hand is 3.50kg and
its center of gravity is at a distance dCG=13.9cm from the elbow
joint.
What is the magnitude of the form Fm, exerted by the triceps?
What is the force exerted by the humerus on the elbow joint?
Homework Answers
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a
man is holding a 2.80kg ball as shown in the figure. the distance
from the...
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 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 is holding a 19-kg child using both hands with his elbows bent in a...
A man is holding a 19-kg child using both hands with his elbows bent in a 90∘ angle. The biceps muscle provides the positive torque he needs to support the child. Determine the force that each of his biceps muscles must exert on the forearm in order to hold the child safely in this position. Ignore the triceps muscle and the mass of the arm. Let the child be l = 0.35 m from the elbow joint, and the biceps...
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...
Consider the case of the bicepts muscle acting on a forearm holding a 35 N weight....
Consider the case of the bicepts muscle acting on a forearm holding a 35 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 18 N and has its center of gravity 15 cm from the elbow. The 35 N weight is held in the hand 30 cm from the joint...
So lost!!!!! Help! Problem: Assume that a 1.00 kg ball is thrown solely by the action of the forearm, which rotates ab...
So lost!!!!! Help! Problem: Assume that a 1.00 kg ball is thrown solely by the action of the forearm, which rotates about the elbow joint under the action of the triceps muscle, as shown in the figure. the ball is accelerated uniformly from rest to 10.0 m/s in .350 s, at which point it is released. The distance from the elbow to the ball is 31 cm. there is 2.5 cm between triceps muscle and axis of rotation(at elbow). A)...
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...
QUESTION 1 A wrench is used to loosen a nut as shown below by applying a...
QUESTION 1 A wrench is used to loosen a nut as shown below by applying a force 13 N. Determine the torque (magnitude and direction:+for CCW and for CW) about the nut joint Express your answer in Sl units with 3 or more significant figures 0.28 m 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 in...
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 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...
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...
Consider the case of the bicepts muscle acting on a forearm holding a 35 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 18 N and has its center of gravity 15 cm from the elbow. The 35 N weight is held in the hand 30 cm from the joint...
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...
QUESTION 1 A wrench is used to loosen a nut as shown below by applying a force 13 N. Determine the torque (magnitude and direction:+for CCW and for CW) about the nut joint Express your answer in Sl units with 3 or more significant figures 0.28 m 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 in...
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