A man holds a 198-N ball in his hand, with the forearmhorizontal (see the figure). He can support the ball in thisposition because of the flexor muscle force M, which isapplied perpendicular to the forearm. The forearm weighs18.5 N and has a center of gravity as indicated. Find (a) themagnitude of M and the (b) magnitude and (c) direction (as apositive angle counterclockwise from horizontal) of the forceapplied by the upper arm bone to the forearm at the elbowjoint.Upperarm bone- Flexor muscleMElbowjointcg0.0510 mtT0.0890 m0.330 m-

Torque on a body is given by the cross product of force acting on it and the distance between the…

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Flexor muscle M Elbow joint 0.0510 mt 0.0890 m 0.330 m-

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter12: Static Equilibrium And Elasticity

Section: Chapter Questions

Problem 24P: When tightening a bolt, you push perpendicularly on a wrench with a force of 165N at a distance of...

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DA man holds a 178-N ball in his hand, with the arm bone- 22. Upper - rlexor muscle forcarm horizontal (sce the draw- ing). 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 22.0 N and has a center of gravity as indicated. Find (a) the magnitude of M and (b) the magnitude and direction of the force applied by the upper arm bone to the forearm at the elbow joint. Elbow cg joint '0.0890 m -0.330 m- 0.0510 m
A man holds a 171, N ball in his hand, with the forearm horizontal. He can support the ball in this position because the flexor muscle force, which is appliedperpendicular to the forearm. The forearm weighs 19.3 N and has a center of gravity as indicated. Find the magnitude of M.
A man holds a 164-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 23.7 N and has a center of gravity as indicated. Find (a) the magnitude of Mand the (b) magnitude and (c) direction (as a positive angle counterclockwise from horizontal) of the force applied by the upper arm bone to the forearm at the elbow joint. Upper arm bone Elbow joint 0.0510 mt M Flexor muscle 0.0890 m 0.330 m
A man holds a 171-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 24.3 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 bone to the forearm at the elbow joint. Upper arm bone Flexor muscle M Elbow cg joint 0.0510 m+ 0.0890 m 0.330 m (a) Number i Units (b) Number i Units (c) Number i Units >
When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm is 1.30 kg . If the biceps is connected to the forearm a distance dbiceps = 3.00 cm from the elbow, how much force Fbiceps must the biceps exert to hold a 750 g ball at the end of the forearm at distance dball = 35.0 cm from the elbow, with the forearm parallel to the floor? How much force Felbow must the elbow exert? (Figure 1)
When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm is 1.30 kg . If the biceps is connected to the forearm a distance dbiceps = 3.00 cm from the elbow, how much force Fbiceps must the biceps exert to hold a 750 g ball at the end of the forearm at distance dball = 35.0 cm from the elbow, with the forearm parallel to the floor? How much force Felbow must the elbow exert? What is the horizontal distance dforearm between the elbow and the point where the weight of the forearm acts?
A man holds a 161-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 18.9 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 to the forearm at the elbow joint. Upper arm bone- Flexor muscle Elbow joint 0.0510 m T0.0890 m -0.330 m- (a) Number i Units (b) Number i Units N (c) Number 270 Units
a person holds a 10.0kg weight in a forearm that is horizontal with the vertical upper arm. The biceps muscles exerts a force Fm distance of d=4.00cm at the elbow joint of horizontal forearm and the upper arm. The mass of the forearm is 1.10kg and its length from the elbow is 32.00cm. A)what is magnitude of muscle force Fm? B) what is magnitude and direction of force F on the forearm at the elbow joint? C) What is the magnitude and direction of force on the elbow joint by the forearm? Model this as an uniform rod
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 , 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 and the (b) magnitude and (c) direction (as a positive angle counterclockwise from horizontal) of the force applied by the upper arm bone to the forearm at the elbow joint.
A man holds a 186-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 21.6 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 to the forearm at the elbow joint. (a) Number (b) Number i (c) Number i Upper arm bone- Elbow joint 0.0510 m+ Units Units Units Flexor muscle M -0.0890 m -0.330 m-
A 72.0 kg weightlifter doing armraises holds a 7.50 kg weight.Her arm pivots around theelbow joint, starting 40.0° belowthe horizontal (Fig.).Biometric measurements haveshown that, together, the forearmsand the hands account for 6.00%of a person’s weight. Since theupper arm is held vertically, thebiceps muscle always acts verticallyand is attached to the bonesof the forearm 5.50 cm from theelbow joint. The center of mass of this person’s forearm–hand combinationis 16.0 cm from the elbow joint, along the bones of the forearm,and she holds the weight 38.0 cm from her elbow joint. (a) Draw a freebodydiagram of the forearm. (b) What force does the biceps muscleexert on the forearm? (c) Find the magnitude and direction of the forcethat the elbow joint exerts on the forearm. (d) As the weightlifter raisesher arm toward a horizontal position, will the force in the biceps muscleincrease, decrease, or stay the same? Why?
A hiker who has broken his forearm rigs a temporary sling using a cordstretching from his shoulder to his hand. The cord holds the forearmlevel and makes an angle of 40.0° with the horizontal where it attachesto the hand. Considering the forearm and hand to be uniform, with atotal mass of 1.30 kg and a length of 0.300 m, find (a) the tension inthe cord and (b) the horizontal and vertical components of the force, f>,exerted by the humerus (the bone of the upper arm) on the radius andulna (the bones of the forearm).