bioe119-spring94-final-Keaveny-exam

bioe119-spring94-final-Keaveny-exam - ME 176 Final Exam...

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ME 176 Final Exam, Spring 1994 Name: ______________________________ Page 1 of 10 Tuesday, May 17, 12:30–3:30 PM, 1994. Please write all answers in the space provided. If you need additional space, write on the back sides. Indicate your answer as clearly as possible for each question. 1. (10 points) Forces and Moments at Joints (i) Draw a free-body diagram of the forearm during a curl exercise (with a 20 kg mass in the hand) that could be used to calculate the resultant force and moment acting on the elbow joint. Include all accelerations in your free body diagram and ignore the mass of the hand. (ii) Based on your free-body diagram, write out the moment equation of motion (dynamics equation) about the elbow joint. Assume that the elbow joint is fixed in space.

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ME 176 Final Exam, Spring 1994 Name: ______________________________ Page 2 of 10 2. (5 points) Joint Stability The lateral collateral ligament in the knee is known to support tensile loads when a medially- directed force is quickly applied to the foot. Determine the magnitude of the medially-directed force F at the foot required to rupture the lateral collateral ligament assuming the strength of the ligament is 1500 N? Use the quadriceps and condylar forces and the dimensions as shown in Figure 1 (overleaf). Figure 1
ME 176 Final Exam, Spring 1994 Name: ______________________________ Page 3 of 10 3. (10 points) Trabecular Bone Micro-mechanics For an open-cell, out-of plane cellular solid (Figure 2) loaded vertically with a stress s *, derive the following expressions based on an analysis of elastic deformations and plastic failure of the vertical rods: i) E * = t L 2 E s cos q 1 + sin q ii) s y * = s ys E * E s

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This note was uploaded on 09/16/2009 for the course BIO ENG 119 taught by Professor Keaveny during the Spring '09 term at Berkeley.

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bioe119-spring94-final-Keaveny-exam - ME 176 Final Exam...

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