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Northwestern UniversityEA 3HW4

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ENGINEERING ANALYSIS 3 SYSTEM DYNAMICS SPRING 2017 HW #4 Assigned April 21, 2017. Due April 28, 2017 at 5:00 pm CST on Canvas. Name : _______________________________ Section Number: _____ Please ... refer to the homework guidelines on the web regarding late HW policy and TA help. This HW requires Matlab programming. Start early. 1. (20 points) A baseball player is running to a base in a baseball game (Figure 1a). He studied EA3 before (with a grade B+) and thinks he can touch the base faster by sliding into the base (Figure 1b). Assume the height of the player is 1.8m, the center of mass of the player is always 0.9m from his toe when he runs, stands or slides, and the player runs at a speed of 7m/s. We will ignore the influence on center of mass due to the movement of his arms and assume his center of mass is on the ground when he slides. His initial sliding speed (when he suddenly drops into a slide) is assumed to be same as his running speed. The acceleration due to gravity is 9.81m/s2, and the coefficient of friction between his body and the dirt is 0.8 when he slides. 1a) 1b) 1-1. Before the game the base runner used above numbers and did a careful calculation on how far away from the base he should be when he [Show More]

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