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- While doing a back squat, you're doing reps with 300 pounds on the barbell (total mass of the barbell and weights; you're strong...you got this!). At the bottom of your squat, your hip is flexed to a 45deg angle, your knee is flexed to a 90deg angle, and your ankle is dorsiflexed to 75deg. The force vector of the barbell is 15cm anterior from the hip joint, 20cm posterior from the knee joint and 12cm anterior from the ankle joint. How much torque is the barbell applying to the hip joint? 138.29Nm extension torque 160.53Nm extension torque 200.66Nm flexion torque News team....ASSEMBLE!!!!!! O 267.55 Nm flexion torqueA professional athlete tears their Achilles tendon. There are two muscles in the back of the leg that pull upward on the Achilles tendon, as shown in the image below. (The Achilles tendon is the gray part above the heel) F₂ (250 N) F, (250 N) (a) Using information from the image above, what is the magnitude of the total force on the Achilles tendon? Number (b) What is the direction of the force on the Achilles tendon in the image? Up Down Left 20% 20° RightTo pull with a force F=172 N on the scale as shown, what should the tension in your biceps muscle be? The distance h = 0.30 m. magnitude Direction
- A person places his hand palm downward on a scale and pushes down on the scale until it reads 96.0 N. The triceps muscle is responsible for this arm extension force. Find the force 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 29.0 cm to the right of the elbow joint. P 96.0 N 2.50 cm and Q = 29.0 cm. where P == For the next three items: A 200 kg plank is projecting a distance L = 5.0 m from a wall which is held steadily by a string that is connected to it at an angle 30° from the horizontal. The plank is actually fasted to the wall where an unknown force is exerted on the plank by the wall. If a 60 kg mass is placed on the plank at a distance d = 1.0 m, find the tension force on the string. Ө d L-3. A 50N body is supported by two ropes, one making 30* with the vertical and the other making 45* with the horizontal. What is the tension in the ropes?
- The forces are in static equilibrium. The 140 lb force is directed along the x-axis and the 300 lb force is directed along the negative z- axis. Determine the magnitude of the unknown force, R. Z X R Ox лог 140lb A (-50, 80, 160) lb By 300 lb уWhen a gymnast performing on the rings executes the iron cross, he maintains the position at rest shown in figure (a). In this maneuver, the gymnast’s feet are off the floor. The primary muscles involved in supporting this position are the latissimus dorsi (“lats”) and the pectoralis major (“pecs”). One of the rings exerts an upward force Fh on a hand as shown in figure (b). The force Fs is exerted by the shoulder joint on the arm. The lats and pecs major muscles exert a total force Fm on the arm. Using the information in the figure, find the magnitude of the force Fm for an athlete of weight 750 N. Hint Fh = 750/2 N.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 uniform meter stick of weight W is held by a thumb pushing down at the 0-cm line and by fingers pushing up at the 5-cm line. What are both forces on the meter stick, the force of the thumb T and the force of the fingers F?Determine the tension in cable AD, BD & CD.A cylinder having a mass of 200 kg is to be supported by the cord that wraps over the pipe. Determine the largest vertical force F that can be appl to the cord without moving the cylinder. The cord passes two times over the pipe. Take s = 0.2.