hmwk10 - (d Compare the “Denver Spiral Headwind” case...

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Homework #10 Due midnight Sunday November 27. 1. Explain in terms of velocity components why lift reduces the optimal launch angle for a golf drive. 2. What are three reasons that the optimal launch angle for a home run in baseball is less than 45 ? 3. The figure on the last page shows the trajectories of footballs for five different conditions. The conditions are listed under the figure in order of range (vacuum is longest). (a) Why is the range longest in vacuum? Explain in terms of forces and velocity components. (b) Why is the range longer for a spiral than for a tumble? (c) Professor Heidbrink says that footballs spend longer falling than ris- ing. Explain this phenomenon in terms of net vertical forces.
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Unformatted text preview: (d) Compare the “Denver Spiral Headwind” case with the “Vacuum” case. Does the football travel farther horizontally while rising or falling? Assuming that the football spends at least as long falling as rising, what does this imply about the horizontal velocity in the two parts of the trajectory? Why does it make sense that the horizontal velocity changes in this way? Warmup Questions Submit answers by 11:00 p.m. Monday November 28. 1. Warmup question for November 29. In sailing, how is it possible to travel faster upwind than downwind? 2. Warmup question for December 1. What sports question do you have that hasn’t been answered yet? 1 2...
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hmwk10 - (d Compare the “Denver Spiral Headwind” case...

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