Answered: John is performing an isometric… | bartleby

Related questions

Question

John is performing an isometric contraction of the quadriceps to hold a 500 N weight at an angle of 45° of knee extension (i.e., 45° below the horizontal). Assume the length of the lower leg is 42.5 cm. How much force must the quadriceps produce if the moment arm for the patellar tendon is 10 mm?

Expert Solution

Step by step

Solved in 4 steps

SEE SOLUTION Check out a sample Q&A here

Blurred answer

Similar questions

A certain wire stretches 1.2 cm when outward forces with magnitude F are applied to each end. The same forces are applied to a wire of the same material but with six times the diameter and 12 times the length. The second wire stretches in cm:
A person places his hand palm downward on a scale and pushes down on the scale until it reads (8.31x10^1) N. The triceps muscle is responsible for this arm extension force. Find the force (in N) exerted by the triceps muscle. The bottom of the triceps muscle is 2.50 cm to the left of the elbow joint, and the palm is pushing at approximately 35.0 cm to the right of the elbow joint. (please ignore the number 96 shown in the scale). Give your answer with three significant figures.
A uniform bar has a length of 1m, and a mass of 5kg. If a 10 kg mass is attached to one end of the bar (at x=0), and a 30 kg mass is attached to the other end (at x=1m). The center of mass is closest to which point? x=0m x=0.3 m x=0.33 m x=0.5m x=0.67 m x=0.70 m x=1.00 m
A spring of unstreched length 25 cm is pulled in a horizontal direction with 150 N force. Since we apply a force in a horizontal direction, the spring is stretched to 28 cm. Now we suspend the spring from a hook in a vertical direction and attached a 15 kg mass at the bottom. How long my spring will stretch?
Kendra holds the end of a rope that is .5 kilograms and .60 meters long, while her friend Lupita holds it on the other end, with a force of 150 N. What is the torque that Kendra withstands? The rope has a Young's Modulus of 55x10^8 Pa, unfortunately, it cannot stretch more than 3 cmfrom 600 Newtons of tensile force, or else it would break apart. Would it break apart in this case?
An athlete strengthens her leg and knee by doing "leg curls." While sitting on a bench with the leg initially bent at the knee, she supports a weight with the foot. She then slowly raises the foot and lower leg, with the upper leg held stationary. Find the tension in the quadriceps tendon for the position shown in the figure below. (Let w = 225 N, D = 44 cm and d = 5.5 cm.) please solve thank you
Two masses, m1 and m2, are attached to a 1.95-m-long steel wire which runs over a light, frictionless pulley as shown. Assume the cross section of the wire is circular with a diameter of d = 4.00 mm, m1 = 3.30 kg, and m2 = 4.90 kg. The masses are released from rest and allowed to move freely. Compared with its length before the masses were attached, by how much has the wire stretched (in mm) while the masses are in\
Could I please get some help with this problem please and thank you!
A 72.0-kg weightlifter doing arm raises holds a 7.50-kg weight. Her arm pivots around the elbow joint, starting 40.0° below the horizontal (Fig. P11.54). Biometric measurements have shown that, together, the forearms and the hands account for 6.00% of a person’s weight. Since the upper arm is held vertically, the biceps muscle always acts verti-cally and is attached to the bones of the forearm 5.50 cm from the elbow joint. The center of mass of this person’s forearm–hand combination is 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 free-body diagram of the forearm. (b) What force does the biceps muscle exert on the forearm? (c) Find the magni-tude and direction of the force that the elbow joint exerts on the forearm. (d) As the weightlifter raises her arm toward a horizontal position, will the force in the biceps muscle increase, decrease, or stay the same? Why? Solve A B C D and show complete solution
The crew on peg leg Petes' ship have mutinied. Now Pete finds himself walking the plank. The plank is 4.5m long and has a mass of 13kg. 3.6 meters of the plank extend out over the waters. The plank pivots on a small rail at the edge of the ship, this is the only point of the plank in direct contact with the ship. The remaining meter of the plank is held in place over the deck by the metal bar. The bar is .6m from the pivot. If Pete has a mass of 111kg, what is the torque provided by the bar when Pete is at the end of the plank?
An athlete strengthens her leg and knee by doing "leg curls." While sitting on a bench with the leg initially bent at the knee, she supports a weight with the foot. She then slowly raises the foot and lower leg, with the upper leg held stationary. Find the tension in the quadriceps tendon for the position shown in the figure below. (Let w = 237 N, D = 43 cm and d = 5.2 cm.) Quadriceps tendon 60° W
A uniform rod is attached to a wall by a hinge at its base. The rod has a mass of 8.5 kg, a length of 1.8 m, is at an angle of 21° above the horizontal, and is held in place by a horizontal cord attached to the other end of the rod and bolted to the wall above the base of the rod. (a) Determine the tension in the cord. (b) Determine the horizontal and vertical components of the force exerted on the rod by the hinge. FH %3D Fv = %3D

SEE MORE QUESTIONS