User:Jmesserly/energy conversion

From Policypedia

• 1 watt = 1 Joule per second
• 1 Kilowatt hour = 3.6 MJoules
• 1 Kilowatt hour = 3,412 Btu
• One joule is the amount of energy needed to lift one pound about nine inches

[edit] BTU =

• 1 gallon of gasoline = 124,000 Btu
• 1 joule = 251.9 calories
  • = 778.26 foot-pounds
  • = 1055 joules
  • = 107.5 kilogram-meters
  • = 0.0002928 kilowatt-hours

[edit] MPG, Gasoline equivalencies

• 1 gallon of gasoline is equivalent to 10 KWHs of electricity from the grid, regardless of weight class- according to calcars site.

[edit] Buoyancy

• ratio of densities = ratio of weights, so
• Density of steel (DS) / density of water (DW) = land weight of steel (W) / weight - apparent weight in water (WWater)
  • DS/DW = W/W-WWater
  • W-WWater = DW * W / DS
  • WWater = W - W * DW / DS
  • Density Steel = 7.85 g/cm3, Density water is 1 gm/cm3
  • WWater = .8726 Weight on land