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Projectile Motion Gets the Hose
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/content/aapt/journal/tpt/49/7/10.1119/1.3639153
1.
1.R. Wolfson, Essential University Physics, 1st ed. (Pearson/Addison-Wesley, San Francisco, CA, 2007), Chap. 3, prob. 73, p. 48.
2.
2.G. W. Ficken, Jr., “Home experiment using a garden hose,” Phys. Teach. 25, 218 (April 1987).
http://dx.doi.org/10.1119/1.2342223
3.
3.N. R. Greene, “Tossing a garden hose,” Phys. Teach. 37, 4647 (Jan. 1999).
http://dx.doi.org/10.1119/1.880150
4.
4.P. Lemaire and C. Waiveris, “Water in a coiled hose,” Phys. Teach. 43, 239242 (April 2005).
http://dx.doi.org/10.1119/1.1888086
5.
5.R. Humbert, “Water nozzles,” Phys. Teach. 43, 604607 (Dec. 2005).
http://dx.doi.org/10.1119/1.2136459
6.
6.R. J. Froehlich, “Water drop pulser,” Phys. Teach. 45, 183184 (March 2007).
http://dx.doi.org/10.1119/1.2709681
7.
7.A. E. G. Falcão Jr., R. A. Gomes, J. M. Pereira, L. F. S. Coelho, and A. C. F. Santos, “Cellular phones helping to get a clearer picture of kinematics,” Phys. Teach. 47, 167168 (March 2009).
http://dx.doi.org/10.1119/1.3081301
8.
8.See, for example, Chap. 15, p. 249 in Ref. 1.
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Image of Fig. 1.

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Fig. 1.

Parabolic trajectory for a standard introductory projectile motion problem. For the problem of interest here, the launch location (origin) and landing point ( , ) are given, as well as the angle that the launch velocity makes with the horizontal. The goal is to find the launch speed .

Image of Fig. 2.

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Fig. 2.

Our water hose trajectory. We placed white boards behind the water stream so that the stream is more visible. The water leaves the tube 1.30 m above the ground with an initial velocity that is 35° above the horizontal. The water lands 3.66 m horizontally from the base of the support rod.

Image of Fig. 3.

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Fig. 3.

The water leaves the glass tube at a launch angle of 35° to the horizontal.

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/content/aapt/journal/tpt/49/7/10.1119/1.3639153
2011-09-07
2014-04-16

Abstract

Students take a weekly quiz in our introductory physics course. During the week in which material focused on projectile motion, we not-so-subtly suggested what problem the students would see on the quiz. The quiz problem was an almost exact replica of a homework problem1 we worked through in the class preceding the quiz. The goal of the problem is to find the launch speed if the final horizontal and vertical positions and launch angle are given. Figure 1 shows a schematic of the trajectory.

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Scitation: Projectile Motion Gets the Hose
http://aip.metastore.ingenta.com/content/aapt/journal/tpt/49/7/10.1119/1.3639153
10.1119/1.3639153
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