What amount of Energy in Joules?
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This is a 2 part question.  You have to figure the amount of heat to raise the temp of the ethanol then find out how much heat to boil.\n\nHeat energy = mass x change in temp x specific heat  \nHeat energy = mass x heat of vaporization\n\nHeat energy = 21 x (76.29-11) x 2.44\nHeat energy = 21 x 38.56\n\nFind those two values and then add them together.
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When 1 Joule of energy is spent in 1 second, the power is said to be 1 Watt.\nIn everyday household use, Watt is used to measure the power of electrical appliances. That is to say, if an appliance is labeled as 220W, it means that the appliance spends 220 Joules of energy(electrical) every second.
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the minimum amount of energy required to start a reaction
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They are both measures of energy. However, joule has mostly replaced calorie except for food where calorie is still the most common measurement. There are two main measurements of the calorie:\n\n* The small calorie or gram calorie is exactly equal to the energy needed to increase the temperature of 1 g of water from 14 °C to 15 °C. This is about 4.185 J. \n* The large calorie or kilogram calorie is exactly to the energy needed to increase the temperature of 1 kg of water from 14 °C to 15 °C. This is about 4.185 kJ, and exactly 1000 small calories. It is named after British scientist James Prescott Joule.\n\nThe joule is the SI unit for energy. The joule is a derived unit defined as the work done or energy required, to exert a force of one newton for a distance of one metre, so the same quantity may be referred to as a newton metre or newton-metre (also with meter spelling), with the symbol N·m or N m. It can also be written as kg·m2/s2. However, the newton metre is usually used as a measure of torque, not energy.\n\nAs a rough guide, 1 joule is the absolute minimum amount of energy required (on the surface of Earth) to lift a one kilogram object up by a height of 10 centimetres. To convert calories to joules, multiply by 4.1868.
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Read the link below\n\nJames Prescott Joule\n\n(born Dec. 24, 1818, Salford, Lancashire, Eng.-died Oct. 11, 1889, Sale, Cheshire) English physicist. After studying under John Dalton, in 1840 he described “Joule's law,” which stated that the heat produced in a wire by an electric current is proportional to the product of the resistance of the wire and the square of the current. In 1843 he published his value for the amount of work required to produce a unit of heat, called the mechanical equivalent of heat, and established that heat is a form of energy. He established that the various forms of energy are basically the same and can be changed from one into another, a discovery that formed the basis of the law of conservation of energy, the first law of thermodynamics. In his honour, the value of the mechanical equivalent of heat is usually represented by the letter J, and a standard unit of work is called the joule.
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power is the amount of work done in unit time \nit is measured in Joules per second , dude
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682 J - 485 J = 196 J\n(energy going into a system is positive, energy going out is negative)
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Work refers to an activity involving a force and movement in the directon of the force. A force of 20 newtons pushing an object 5 meters in the direction of the force does 100 joules of work. \n\nEnergy is the capacity for doing work. You must have energy to accomplish work - it is like the "currency" for performing work. To do 100 joules of work, you must expend 100 joules of energy. \n\nPower is the rate of doing work or the rate of using energy, which are numerically the same. If you do 100 joules of work in one second (using 100 joules of energy), the power is 100 watts.
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Absolute zero refers to 0 degress Kelvin -- a measure of temperature.\n\nA Joule is the "metric" standard measure of energy.\n\nCalories are an older measure of thermal energy.\n\n1 Calorie = 4.18 Joules.
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Kinetic energy = 1/2 x mass x velocity^2\n\nYour velocity would be in meters/sec probably, but you don't mention a mass.\n\nmass is measured in kilograms\n\nEnergy is measured in joules.
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read this\n\nhttp://en.wikipedia.org/wiki/Energy
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a) v^2-u^2=2as\n    v^2-52.4^2=2*(-9.8)*28.5\nv^2= 2745.8-558.6\n     =2187.2\nv=46.76m/s\n\nKinetic Energy=1/2mv^2\n                     =1/2*46.9*46.76^2\n                      =51,290 Joules\n\nb)height=28.5-5.06=23.44m\n\nv^2-u^2=2as\n\nv^2-52.4^2=2*(-9.8)*23.44\nv^2=2745.8-459.42\n     =2286.4\nv=47.8m/s
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The specific heat of water is 4.184 J/g C.\n\nSince water's density is 1 g/ mL, 500 mL of water will have a mass of 500 g.\n\nThe equation to calculate the joules of energy required is:\nheat = mass x specific heat x change in temperature\n\nenergy = 500 (4.184)(95-25)\nenergy = 146440 J or 146.44 kJ\n\nHope that helped.
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KE= 1/2 * m * v^2\n250,000 joules= 400* v^2\nV^2= 625 so v= 25 m/s or 0.025 km/s or 90 km/hr
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Kinetic energy is the form of energy that involves mass in motion.\n\nE - energy, in ergs\n=\nm - mass, in grams times\nc^2 - the speed of light, in meters per second (300,000,000), squared.\n\nTake one gram of matter and convert it entirely into energy.  It will equal:\n300,000,000 x 300,000,000 or\n90,000,000,000,000,000 (9 x 10^16) ergs.\n\nAn erg is a very small unit of energy; on the other hand, that's a helluva lot of ergs.  By my very rough calculations, the energy from 1 gram of mass would power a million 100-watt lightbulbs for 1 second, or one lightbulb for 3 years.\n\n(1 watt-hour=36,000,000,000 ergs. 1 joule=10,000,000 ergs.  1 horsepower-hour=26,845,000,000,000 ergs. 1 calorie=41,868,000 ergs.)
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1000 Joule = 1kJ\n109.47J * 1000 = 109470\nSo, yes...it is.
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4.184 J = 1 calorie\n\n4.184 * 542 =   x\n  x= 2267.7 Joules