Most of the motion generated by joints in the human body are examples of levers. An example of a third class lever is the forearm; the force which generates the motion is located in-between the pivot point and the resistance force. The elbow acts as the pivot point, the biceps muscle pulls up on the forearm to move the mass which is held in the hand. Imagine someone is holding an object in her hand with her forearm horizontal and her upper arm vertical so her elbow creates a 90° angle. If her biceps attach to her forearm 0.0511 m from the elbow and make an angle of 26.0° with the vertical while a 2.76 kg mass is held in her hand 29.89 cm from the elbow, what force F is exerted by the biceps muscle? Ignore the mass of the forearm. F =

Most of the motion generated by joints in the human body are examples of levers. An example of a third class lever is the forearm; the force which generates the motion is located in-between the pivot point and the resistance force. The elbow acts as the pivot point, the biceps muscle pulls up on the forearm to move the mass which is held in the hand. Imagine someone is holding an object in her hand with her forearm horizontal and her upper arm vertical so her elbow creates a 90° angle. If her biceps attach to her forearm 0.0511 m from the elbow and make an angle of 26.0° with the vertical while a 2.76 kg mass is held in her hand 29.89 cm from the elbow, what force F is exerted by the biceps muscle? Ignore the mass of the forearm. F =

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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The figure shows the biomechanical model of the foot of a sprinter just before starting a race. You are asked to determine the magnitude of the force exerted on the heel by the Achilles tendon, FH, and the magnitude of the force exerted on the foot at the ankle joint, F.J. Also indicate what type of lever it corresponds to and the reason MA (mechanical advantage) for the configuration shown.
Sergei uses a lever to lift a heavy rock. He obtains a 2.5 m lever and places the fulcrum 0.7 m from the rock. What is the ideal mechanical advantage of Sergei's levér? A 0.32 0.47 2.6 D 3.1
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Most of the motion generated by joints in the human body are examples of levers. An example of a third class lever is the forearm; the force which generates the motion is located in‑between the pivot point and the resistance force. The elbow acts as the pivot point, the biceps muscle pulls up on the forearm to move the mass which is held in the hand. Imagine someone is holding an object in her hand with her forearm horizontal and her upper arm vertical so her elbow creates a 90∘ angle. If her biceps attach to her forearm 0.0597 m from the elbow and make an angle of 30.0∘ with the vertical while a 2.76 kg mass is held in her hand 29.03 cm from the elbow, what force ? is exerted by the biceps muscle? Ignore the mass of the forearm.
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