How much weight will two 55 gallon plastic barrels support in water?
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The following link is a pdf slide show that gives examples of buoyancy calculations and theory of floating objects.\n\nhttp://www.colorado.edu/physics/phys1010/phys1010_fa05/lectures/class12-09-29.pdf
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***Important Note***\nYou should consult a petroleum engineer who is familiar with the specifics of your work if you require this information for actual field work.  The sources below are fine if you are looking for general information not to be used in the field.\n\nYou need to be more specific about the information you need.  There are several 2 7/8" drill pipes available and the weight varies.  If you need to know the weight of drill pipe that has become stuck while drilling, you have to take buoyancy into account.  Try the first link for the weight and the second link for the discussion about buoyancy.
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OK, the barrel´s mass is 40Kg (notice: its mass is 40 Kg, not its weight). \n\na) So, your formula is Weight = mass(m)*gravity´s acceleration(g)= 40Kg*10m/s^2 = 400 KG*m/s^2 (=400 Newton)\n\nb) Work = force * distance\nSince work is calculated only for the vertical, and the force equals the weight, you have:\nWork = 400N*5m = 2000 Joule\n\nc) Eff = 250N*5m/2000J*100 = 0.625*100 = 62.5%\n(You got 12.5% because you forgot to multiply 250N for 5 meters. Remember that efficiency is a relation of works, and work is force * DISTANCE).\n;o)
588958
the weight will be according 2 density of the material \n\nfor example for water 1  liter wighs 1 kg
33367
where the oak barrel is a cylinder:\n\nto get the weight, multiply 12*(the area-area of the tube)*density of water\n\np1v1t1=p2v2t2 to get the pressure of the water, where p1 is atmospheric, however you need to know how tall the barrel is to do this\n\np2*the area of the lid to get the pressure on the top
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Water at sea level weighs about 8.3 pounds per gallon.
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Most of the world uses the Metric system, so in order to have a container with a general amount of material, a 55 gallon drum was set because it equals roughly a 200 liter drum (208 liters to be exact because a gallon is 3.785 liters). Big enough to hold plenty of material yet movable by one person.
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Try this....\n\nhttp://www.efunda.com/formulae/solid_mechanics/mat_mechanics/pressure_vessel.cfm
145334
Multiply cubic feet by 7.481 to get gallons.
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Want to see something neat??\n\nType "19 gallons in cubic feet." into google.\n\nWorks for all kinds of conversions.
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Whether your tanks are safe or not depends on the area over which they are imposing a load.  Domestic floors are often constructed to take about 150 kilos per square meter, or about 400 pounds per square yard.  The water in your tanks weighs about 370 kilos, a bit over 800 pounds, so if their area is over two square yards you should be OK.  If they're standing on tables, though, you might want to put some boards under the table legs to spread the load a bit.
132742
If it is a 50 pound cylinder, wouldn't it weigh 50 pounds?
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Each anchor manufacturer will have a table for each style, but figure that means about 1 lb per foot for a pivoting-fluke anchor, or 2 lbs per foot for a yachtsman-type anchor.\n\nIf you just want to use a big chunk of concrete as a deadweight, you should have 2 of 150 lbs each.
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About 8 pounds.\n\nHere are more technical answers: \n\n\n8.34lbs \n\n1 gallon of fresh water is about 8.36 \n\nAccording to the 21st edition of The Machinery's Handbook, 1 galon of water weighs 8.337 pounds. \n\nTo answer this question more appropriately you would have to know the temperature of the water. As water cools it becomes more dense until it reaches 39.2 degrees fahrenheit. Below this temperature the density decreases and the water molecules spread apart. 1 liter of water/ice at will actually weigh less than 1 liter of water at say 80 degress fahrenheit. \n\nOne cubic foot of water contains 7.48 gallons of water, weighing in at 62.31 pounds. \n\nThe Handbook of Chemistry and Physics specifies the weight of 1 US gallon of water in air at 68 degrees F to be 8.32487 pounds or 3776.103 grams.
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at least half a gallon.
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Too few details... you need to disclose base area of tank, shape of it (is your tank cylindrical, spherical, cuboid, pyramid, etc).\n\nBUT, assuming it's a cuboid OR cylindrical (meaning has a round base and sides aren't tapered),\n\nif 210 barrels is 6 feet tall,\nthen 210 barrels => (6 x 12) inches\n     210 => 72 inches\nso   210/2.1 => 72/2.1\n     100 => 720/21 inches\n          = 34 6/21 inches\n          = 2 feet 10 6/21 inches\n          approx 2 feet 10.3 inches
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Pieces of white plastic barrels.(and some black paint)