Module 4- Real-World Physics Discussion

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1 The one “Aha!” moment hit me this week when reading about Huckleberry Finn (Ostdiek et al., 2018). The example talks about Huck Finn needing to build a raft using empty plastic milk containers in order to support the weight of 300 pounds, presumably a man named Jim. In today’s discussion I focused on buoyancy force and calculating the volume required to support the weight of an object in water. This can be utilized when working with objects in the water, say for instance pontoon skies on a float plane. You first would find the buoyancy force required by that aircraft, which would equal the weight of the water displaced. The weight of the water displaced is equal to the density of water (62.4 lb/ft3 shown in Table 4.4) multiplied by the volume of water displaced. So, for example, let’s say that the aircraft has a maximum takeoff weight of 5,000 lbs., therefore we would need to displace 5,000 lbs. of weight between two skies; this would be our buoyancy force required. We do not know the volume; thus, we would divide both sides of the equation by 62.4 (the density of water) yielding a required volume of 80.128 ft 3 or 40.064 ft 3 per ski. Now if we were innovative and could fit plastic milk containers into our skies, we would have to multiply 40.064 times 7.48 gallons (one cubic foot equates to 7.48 gallons). This would give us 5.356-gallon jugs, or 6 to be on the safe side, per ski. From “Alaska "The Float Plane" Sept 2010” by Kenneth Browning, 2010, http://softhacke.blogspot.com/2010/09/alaska-float-plane.html Links to an external site. Copyright 2010 by Softhacke.
2 My “Aha!” to this discussion was really from when I remember going to a friend of mine’s new house as kid. They had just built a house on a good-sized land in the country which took about 20 minutes to get to. Upon arriving, I noticed a pond they had created to go fishing in and just having fun. What’s better on a pond than having a raft, just like Huck Finn. The only difference between their raft, the book’s version of their raft and my friends, is that they used Styrofoam as a means to support the weight. I was extremely impressed that it worked so well, and I only remember it being about four inches think. While this was very interesting to see physics at work (obviously I did not realize it at such a young age), I am curious as to how well it held up over the years. From “Styrofoam Are Used to Make Specialty Floats and Work Barges” by Universal Construction Foam, 2022, https://universalconstructionfoam.com/projects/styrofoam-are-used- to-make-specialty-floats-and-work-barges/ Links to an external site. Copyright 2022 by Universal Foam Products. References: Browning, K. (2010, September 8). Alaska "The Float Plane" Sept 2010. Softhacke. Retrieved June 15, 2022, from http://softhacke.blogspot.com/2010/09/alaska-float-plane.html Links to an external site. Ostdiek, V., & Bord, D. (2018). Inquiry into Physics. (8th ed.) Cengage Learning Inc.
3 Universal Construction Foam. (2022). Styrofoam Are Used to Make Specialty Floats and Work Barges. Universal Foam Products. Retrieved June 15, 2022, from https://universalconstructionfoam.com/projects/styrofoam-are-used- to-make-specialty-floats-and-work-barges/ Links to an external site.
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