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| − | ==Operating charateristics== | + | ==Operating characteristics== |
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| − | !|__ RPS = ___ RPM | + | !|____ RPS = ______ RPM |
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| − | !|__ RPS = ___ RPM | + | !|____ RPS = ______ RPM |
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| − | !|__ RPS = ___ RPM | + | !|____ RPS = ______ RPM |
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| − | !|__ RPS = ___ RPM | + | !|____ RPS = ______ RPM |
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| − | ==Unit Conversions==
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| − | '''Why care about inches?'''
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| − | * In the Imperial system of measurement, inches are usually divided into halves, which means base 2 for anything shorter than 1 inch. 1/2", 1/4", 1/8", and 1/16" are commonly used measurements.
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| − | * If you view the listings for block neodymium magnets from a supplier such as Magnet4less.com, Magnet4sale.com, or KJmagnetics.com, you can find out that magnet lengths, widths, and heights are in inches.
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| − | * While the metric system is clearly more useful for scientific purposes, the base 2 system used for sub-inch imperial mesaurements is actually quite helpful for making interlocking assemblies composed of different-sized blocks.
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| − | '''Useful'''
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| − | * 1 inch (in) = 2.54 centimeters (cm)
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| − | * 1 foot (ft) = 0.3084 meters (m)
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| − | * 1 cubic inch (in³) = 16.39 milliliters (mL) = 1.639 * 10^-5 cubic meters (m³)
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| − | '''Logical'''
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| − | * 1 amp-hour (Ah) = 3600 Coulombs (C)
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| − | * 1 milliamp-hour (mAh) = 3.6 Coulombs (C)
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| − | * 1 cubic meter (m³) = 10^3 cubic decimeters (dm³) = 10^6 cubic centimeters (cm³)
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| − | * 1 cubic meter (m³) = 10^3 liters (L) = 10^6 milliliters (mL)
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| − | '''Strange'''
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| − | * 1 gallon (gal) = 2^2 quarts (qt) = 2^3 pints (pt) = 2^4 cups (C) = 2^7 fluid ounces (fl oz.) = 2^8 tablespoons (Tbps)
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| − | * 2000 Calories (kCal) = 2.324 kilowatt-hours (kWh)
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| − | * 100 Calories per 2 Tablespoons (kCal/Tbsp) = 3,930 watt-hours per liter (Wh/L)
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| − | '''Surprising'''
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| − | * Energy of a <span style="color:red">'''neodymium magnet'''</span> at 1.5 Tesla (T)
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| − | **(1.5 Tesla)^2/(2*4pi*10^-7 Henries per meter) * (1.639 * 10^-5 cubic meters) = <span style="color:red">'''14.67 Newton-meters (Nm) in a cubic inch'''</span>
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| − | **''Conclusion: A cubic inch neomagnet, if depleted of its magnetic energy, could not even run a 15 watt light bulb for one second.''
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| − | * Energy of a <span style="color:green">'''AA Battery'''</span> (7.7 mL) at 1.5 Volts (V) and 2000 milliamp-hours (mAh)
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| − | **(1.5 Volts * 7200 Coulombs) * (16.39 ml / 7.7 mL) = <span style="color:green">'''22,990 Newton-meters (Nm) in a cubic inch (> 1,500x)'''</span>
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| − | ** ''Conclusion: The magnetic field energy of a magnet, if depleted, would yield less than 0.1% as much energy as a battery of the same size.''
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| − | * Energy of <span style="color:blue">'''Peanut Butter'''</span> at 100 Calories per 2 Tablespoons
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| − | **(3,930 Wh/L) * (3600 Nm/Wh) * (0.01639 L) = <span style="color:blue">'''231,900 Newton-meters (Nm) in a cubic inch (> 15,000x)'''</span>
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| − | ** ''Conclusion: Food sources of energy can be substantially more energy dense than typical battery tech.''
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| − | '''What makes this surprise useful?'''
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| − | * Sometimes online a person makes the argument that a machine is powered by magnets and that such magnets would provide energy as long as they last.
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| − | * This argument can sometimes be used to explain away significant amounts of net work with the notion that such magnets are being spent through demagnetization.
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| − | * In light of the fact that the energy density of neodymium magnets is less than 0.1% of the energy density of simple Alkaline battery chemistry, powering motors by utilizing the weakening of the magnet field of otherwise permanent magnets is not a plausible mechanism for explaining any output of significance.
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