A bodybuilder holds a dumbbell of weight Wd. His arm is horizontal and weighs 38 N. The deltoid muscle is assumed to be the only muscle acting and is attached to the arm as shown. The maximum force M→ that the deltoid muscle can supply has a magnitude of 2849 N. The distances that locate where the various forces act on the arm. What is the weight of the heaviest dumbbell that can be held by the bodybuilder? Note: Express your answer in whole numbers. No unit is required for the final answer. M 13.0° +y Wa Wa 0.150 m 0.280 m 0.620 m (b) Free-body diagram of the arm M Deltoid Dumbbell 13.0° muscle Axis W Wa Shoulder joint (a) (c) Round your answer to 0 decimal places. 11 minutes remaining

A bodybuilder holds a dumbbell of weight Wd. His arm is horizontal and weighs 38 N. The deltoid muscle is assumed to be the only muscle acting and is attached to the arm as shown. The maximum force M→ that the deltoid muscle can supply has a magnitude of 2849 N. The distances that locate where the various forces act on the arm. What is the weight of the heaviest dumbbell that can be held by the bodybuilder? Note: Express your answer in whole numbers. No unit is required for the final answer. M 13.0° +y Wa Wa 0.150 m 0.280 m 0.620 m (b) Free-body diagram of the arm M Deltoid Dumbbell 13.0° muscle Axis W Wa Shoulder joint (a) (c) Round your answer to 0 decimal places. 11 minutes remaining

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...

See similar textbooks

Similar questions

When tightening a bolt, you push perpendicularly on a wrench with a force of 165N at a distance of 0.140m from the center of the bolt. How much torque are you exerting relative to the center of the bolt?
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 bodybuilder holds a dumbbell of weight Wd. His arm is horizontal and weighs 47 N. The deltoid muscle is assumed to be the only muscle acting and is attached to the arm as shown. The maximum force M that the deltoid muscle can supply has a magnitude of 2481 N. The distances that locate where the various forces act on the arm. What is the weight of the heaviest dumbbell that can be held by the bodybuilder? Note: Express your answer in whole numbers. No unit is required for the final answer. M. ... r13.0° +y Wa 0.150 m 0.280 m +T 0.620 m (b) Free-body diagram of the arm M Deltoid Dumbbell 13.0 muscle Axis Shoulder joint (a) (c)
Approximately what magnitude force, FM, must the extensor muscle in the upper arm exert on the lower arm to hold a 4.3-kg shot put (Figure 1)? Assume the lower arm has a mass of 3.0 kg and its CG is 13 cm from the elbow-joint pivot.
The arm in the figure below weighs 37.7 N. The force of gravity acting on the arm acts through point A. Determine the magnitudes of the tension force in the deltoid muscle and the force F S exerted by the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown. (Enter your answers to at least the nearest newton.) N Ft Fs N √12⁰ 0 F 0.080 m -0.290 m TE
During most of the stance phase of the gait, the knee flexion is less than 20º. What force must the quadriceps muscle apply to maintain this flexion while standing on one leg? The patient's weight is 836N, assuming that the distance from the center of the joint to the line of gravity is 5 cm and the distance perpendicular to the center of the joint towards which the muscle acts is 5 cm, and the muscle acts ( pull) at 60º to the horizontal.
A physics student is getting some physical education, specifically doing a pushup, sohe’s supported by his feet and by his hands directly below his shoulders. At the bottomof the pushup, when his body is level, his center of mass is 39 cm from his shoulders and99 cm from his feet, and his mass is 75 kg. Find the force on his hands and the force onhis feet.
Consider the person lifting a heavy box with his back, shown in Figure,The mass of the upper body is 55.0 kg and the mass of the box is 30.0 kg.Calculate the magnitude of the force FB –in the back muscles that is needed to support the upper body plus the box and compare this with his weight.
The plank is a great way to strengthen abdominal, back, and shoulder muscles. You can also use this exercise position to locate your center of gravity. Holding plank position with a scale under his toes and another under his forearms, one athlete measured that 66.0% of his weight was supported by his forearms and 34.0% by his toes. (That is, the total normal forces on his forearms and toes were 0.660w and 0.340w, respectively, where w is the athlete’s weight.) He is 1.80 m tall, and in plank position the distance from his toes to the middle of his forearms is 1.53 m. How far from his toes is his center of gravity?
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?
The triceps muscle at the back of her upper arm has an effective lever arm of 1.75 cm, and she exerts force on the floor at a horizontal distance of 20.0 cm from the elbow joint. Calculate the magnitude of the force in each triceps muscle, and compare it to her weight.