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I decided to set up the second scenario first.

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Under the assumption that the temperature was 20°C, I calculated the speed of sound using the equation for air.

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Knowing that this straw oboe acts as a pipe closed at one end, I was able to use the length of the straw to calculate the wavelength.

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Using the speed of sound and the wavelength that I previously calculated, I was able to calculate the fundamental frequency of the oboe. This is quite a bit higher than my measured frequency. It's a little odd, because the fundamental frequency is the lowest frequency of a periodic wave form, yet it's much higher than my measured frequency. I guess this is because the app I used on my phone isn't all too accurate, and also because it's hard to make the exact same pitch constantly on this straw oboe, so the results may have gotten a bit wonky.

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This is actually quite close to my measured period, only .0004 seconds off.

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Calculating Wave speed using my measured frequency

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Calculating Wave speed using my measured frequency

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Just out of curiosity, I measured what the wave speed actually would be according to the frequency of the sound that I measured. After this calculation, I was curious whether this value was close to what the speed of sound would be in the temperature of my house. My house was at 74° F at the time, so I calculated the speed of sound using that temperature. Sadly, it's 345 m/s, which is not anywhere near the wave speed I calculated. I think this is because one, the air in my house is not completely dry, and two, this wavespeed relies on my measured frequency, which I explained why it may be off previously.

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Calculating Intensity using measured Intensity Level

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Calculating Intensity using measured Intensity Level

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Calculating Power using measured Radius of straw opening

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Calculating Power using measured Radius of straw opening

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Admire my beautiful (not) drawing skills.
I realized a bit too late that I wasn't supposed to label the crests and troughs on this one.

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Demonstrating how pitch, timbre, and volume are related to wave shape, amplitude, and frequency.

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Demonstrating how pitch, timbre, and volume are related to wave shape, amplitude, and frequency.

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If only I could actually play any instruments. I do play a mean straw oboe, though.

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Some of these are very rough measurements, so take them with a grain of salt.

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What a relief that I get to draw a free body diagram for this scenario, it felt so weird not drawing one for the straw oboe!

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Calculation of Buoyant Force and Force of Gravity

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Calculating Volume of my object using my measurements

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Calculating Volume of my object using my measurements

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I thought why not?

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Calculating Density of my object using measured mass and volume

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Calculating Density of my object using measured mass and volume

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I thought this density seemed awfully high until I remembered that the density of water was 1000 kg/m^3, and that shut me right up.

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Calculating Submerged Volume using Buoyant Force (FAIL)

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Calculating Submerged Volume using Buoyant Force (FAIL)

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According to this, 100% of the volume was submerged in water, which I can say without a doubt, is not true.

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Calculating Submerged Volume using other Equation

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Calculating Submerged Volume using other Equation

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Now this value makes a lot more sense.

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Calculating Percentage of Object's Volume submerged

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Calculating Percentage of Object's Volume submerged

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This isn't for points, but I wanted to see how this value compared to what I saw in reality. About 7.8% is a pretty realistic number, actually. It actually looked like only that much was submerged under the water.

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I'm not sure about this, but extra calculations don't hurt. Since there's no forces in the x direction, the net force is equal to the buoyant force!

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Calculating wave Frequency using my measurements

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Calculating wave Frequency using my measurements

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I chose to use sin, rather than cos, because I figured that the waves began at equilibrium rather than starting at max amplitude, and besides, I measured them from equilibrium. The waves moved in the positive x direction, so I made it minus x/v. I wasn't sure if I was supposed to substitute my measured time in for t, but we didn't substitute it in in any of our practice problems during lecture videos, so I decided not to. This wave equation utilized my very rough measurements of wavelength and amplitude, so it's not the most accurate of equations.

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This diagram is NOT drawn to scale. The waves are not drawn very equally, but that is only due to my poor drawing skills, just imagine that they are perfect.

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Wave Skills and Fluids together + Wave skills and Forces together

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Wave Skills and Fluids together + Wave skills and Forces together

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I have successfully used wave skills, fluids, and forces all together in this scenario!

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Well, it's been a long, tough 8 weeks, but it has finally come to an end. Thank you for making this online class very easy to navigate and making such great lecture videos, such that I feel like I learned more than I would if the class was in person. I wish you both the best, and thank you again!