UMass Amherst KIN 100 - problem-set4-2018sp (3 pages)

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problem-set4-2018sp

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Pages:
3
School:
University of Massachusetts Amherst
Course:
Kin 100 - Introduction to Kinesiology
Introduction to Kinesiology Documents

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KIN 430 Biomechanics Spring Semester 2018 Problem Set 4 20 points Due on Monday April 30 2018 in class To receive full credit you must hand the completed problem set directly to one of the course instructors do not slip it under a door or leave it in the front office Answer the following questions by placing your answers in the spaces provided Do all of your calculations on separate sheets of paper clearly indicating which calculations go with which problem Staple the separate sheets of paper to this problem set before you turn it in You must show your calculations to receive full credit even if you have the correct answers Don t forget to include proper units 1 4 pts A power lifter performs a dead lift raising a barbell with a mass of 255 kg through a vertical displacement of 0 53 m above the ground giving the barbell 1325 82 J of potential energy The power lifter then releases the barbell letting it drop to the ground Determine the magnitude of the vertical velocity of the barbell right as it reaches the ground using both a mechanical energy approach and a projectile motion approach Be sure to show your work for both approaches Use 9 81 m s2 for g and assume the barbell was at rest right before it was dropped Vertical velocity using mechanical energy approach Vertical velocity using projectile motion approach 2 4 pts As a person is extending their arm their biceps brachialis and triceps muscles generate forces about their elbow joint ignore any other muscles that act about the elbow At one point during the movement the magnitudes of the forces in two of the muscles were biceps 486 N and triceps 1873 N The magnitudes of the muscle moment arms about the elbow joint were biceps 0 042 m brachialis 0 028 m and triceps 0 032 m What is the force generated by the brachialis muscle if the net joint torque is 32 6 N m If the brachialis force was zero what would the magnitude of the net joint torque be Note a negative torque means a net extension torque at the elbow joint



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