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Question:

Question about a calculation.?

I had an aluminum slug that I measured the mass of as 8.669gThe length was 2.8cmThe radius was .950 cmThe volume (using a volumetric cylinder) was 3.5cm^3^We are supposed to do a calculated volume using (pir^2^h) also.but when I do it with the formula, it doesn't come out the same both waysI think I'm following everything, but it's just not coming close to being equalAm I doing something wrong, or did we (more than likely) not measure something right?

Answer:

Measurments, almost never 100% with predicated values from formulas but these numbers are way off you must have measured something wrongI get about 7 cm^3 when uing the formula and baout 23.4 cm^3 when using density and mass, so either the shape was not a true cylinder, you measured wrong, or it was not true solid aluminum
SureAppliances like AC units, like refrigerators, work off a thermostat which turns them on and off as neededThey are designed to be left running on their own foreverIt does not make sense that a manufacturer would design and sell a unit which would fail in short order if left ON overnight.

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