In the school cafeteria, a trouble-making child blows a 12.0 g

| June 14, 2018

In the school cafeteria, a trouble-making child blows a 12.0 g spitball through a 25.0 cm straw. The force (F) in Newtons, of his breath as a function of the distance along the straw (x) in me- ters, can be modeled as a linearly decreasing function for the first half of the straw then a con- stant force through the rest of the straw. The force decreases by half along the first half of the straw. Assume there is negligible friction and the straw is held horizontally. (a) Sketch a plot of the force of his breath as a function of position along the straw, labeling the force at x = 0 as F0. (b) If the spitball begins from rest and leaves the straw with a speed of 16 m/s, how much work is done on the spitball. (c) What is the maximum force F0, that acts on the spitball?

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