Leg curl -105 pounds resistance (R) =105 Distance from knee joint to ankle = 40

Question

Leg curl -105 pounds resistance (R) =105 Distance from knee joint to ankle = 40 cm Distance from knee joint to where hamstring attaches = 6cm How much force must your hamstrings generate in order to lift this weight? Lateral raise - 25 pounds resistance (R) = 25 Distance from shoulder joint to hand = 54 cm Distance from shoulder joint to where deltoid attaches = 9cm What is the minimum amount of force needed by the deltoid to lift this weight? Calf muscles on one leg can generate 360 lbs of force Distance from the joint of your toe to the heal, where the muscle attaches = 25cm Distance from the joint of your toes with your foot to where your tibia forces weight down on your foot = 22cm If you stood on one leg and then used your calf muscles to lift yourself onto the ball of your foot, what is the maximum amount of weight you could lift on one leg? resistance (R) Right bicep can generate 225 lbs of force The distance from your elbow joint to the hand where you are holding the dumbbell = 30cm The distance from your elbow joint to the insertion of the biceps = 5cm What is the maximum amount of weight that you can lift with that arm? You weigh - 240 pounds resistance (R) = 240 The distance from the joint of your toe with your foot to your heel, where the muscles insert = 27 cm The distance from the joint of your toes with your foot to where your tibia forces weight down on your foot = 23 cm If you stood on one leg and then used your calf muscles to lift yourself onto the ball of your foot, how much force would your calf muscles have to exert in order to lift your body weight? Bicep curl - 30 pounds resistance (R) = 30 Distance from your elbow to the wrist = 32 cm Distance from the elbow to the insertion of your biceps= 5cm How much force must your bicep generate in order to lift that weight

Explanation / Answer

1.E=R*R(a)/E(a)

R=105

R(a)=distance from knee to ankle-distance from knee to hamstring=40-6=34

E(a)=40

E=105*34/40=>89.25 newton

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