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Unformatted text preview: BME 314, Fall 2010 HW 2, Due Tuesday, October 19, 2010 Always work problems in the units provided (if provided with English units, work in English, if provided with metric units, then work in metric). Define all equations used and provide explanatory comments to allow one to easily follow your work. 1. A 60-N weight is held in the hand with the forearm making a 90° angle with the upper arm as shown in the figure below (note: the arm is held steady and is not moving). The biceps muscle exerts a force F m that is 3.4 cm from the pivot point "O" at the elbow joint. Neglecting the weight of the arm and hand, what is the magnitude of F m if the distance from the weight to the pivot point is 30 cm? Draw a free body diagram. The sum of moments is equal to zero, therefore: Fm*3.4-60N*30=0 Fm=529.4 N 2. Blood supply to the heart occurs through coronary arteries. Consider one of the arteries to be 3 mm in diameter and 2 cm in length. The average velocity of blood flow through that artery is 1.3 cm/s. Assuming diameter and 2 cm in length....
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