Physics
Physics, 29.07.2019 21:30, jahnoibenjamin

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 1.40 kg . if the biceps is connected to the forearm a distance dbiceps = 2.50 cm from the elbow, how much force fbiceps must the biceps exert to hold a 1000 g ball at the end of the forearm at distance dball = 33.0 cm from the elbow, with the forearm parallel to the floor? how much force felbow must the elbow exert? draw the vectors starting from the point of application of each force. the location and orientation of the vectors will be graded. the length of the vectors will not be graded?

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Physics, 29.06.2019 16:10, alondrahernande3
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 you are holding an object in your hand with your forearm horizontal and your upper arm vertical so your elbow creates a 90 angle. if your biceps áttach to your forearm 0.0554 m from the elbow and make an angle of 25.0 with the vertical while a 3.14 kg mass is held in your hand 29.46 cm from the elbow, what force is exerted by the biceps muscle? ignore the mass of the forearm
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Physics, 03.08.2019 01:30, yrkfred1440
The bones of the forearm (radius and ulna) are hinged to the humerus at the elbow. the biceps muscle connects to the bones of the forearm about 2.152.15 cm beyond the joint. assume the forearm has a mass of 2.452.45 kg and a length of 0.4650.465 m. when the humerus and the biceps are nearly vertical and the forearm is horizontal, if a person wishes to hold an object of mass 6.556.55 kg so that her forearm remains motionless, what is the force exerted by the biceps muscle?
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Mathematics, 24.09.2019 06:00, missymiss4273
In the human arm, the forearm and hand pivot about the elbow joint. consider a simplified model in which the biceps muscle is attached to the forearm 3.80 cm from the elbow joint. assume that the person's hand and forearm together weigh 15.0 n and that their center of gravity is 15.0 cm from the elbow (not quite halfway to the hand). the forearm is held horizontally at a right angle to the upper arm, with the biceps muscle exerting its force perpendicular to the forearm.
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Physics, 19.11.2019 01:31, edith47
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 29.0∘ with the vertical while a 2.00 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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