start:miscellaneous:energy

Energy

This section as for goal to present different energy conversion and examples1).

In every use:

  • Mechanical: the sum of macroscopic translational and rotational kinetic and potential energies
  • Gravitational: potential energy due to or stored in gravitational fields
  • Chemical: potential energy due to chemical bonds
  • Elastic: potential energy due to the deformation of a material (or its container) exhibiting a restorative force
  • Sound wave: kinetic and potential energy in a fluid due to a sound propagated wave (a particular form of mechanical wave)
  • Radiant: potential energy stored in the fields of propagated by electromagnetic radiation, including light
  • Thermal: kinetic energy of the microscopic motion of particles, a form of disordered equivalent of mechanical energy

Microscopic energy:

  • Mechanical wave: kinetic and potential energy in an elastic material due to a propagated deformational wave
  • Electric: potential energy due to or stored in electric fields
  • Magnetic: potential energy due to or stored in magnetic fields
  • Ionization: potential energy that binds an electron to its atom or molecule
  • Nuclear: potential energy that binds nucleons to form the atomic nucleus (and nuclear reactions)
  • Chromodynamic: potential energy that binds quarks to form hadrons
  • Rest: potential energy due to an object's rest mass
  • 1 J = 1 m.N = 1 W.s
  • 1 W.h = 3.6 kJ
  • 1 cal = 4.184 J
  • 1 hp.s = 750 J (one horsepower for 1s)

  • 10 fJ = energy deliverer to a the eardrum by listening one second to a whisper
  • 1 dJ = energy of a leaf falling one meter on earth
  • 1 J = kinetic energy produced as an extra small apple (~100 grams) falls 1 meter against Earth's gravity
  • 1 J = energy required to heat 1 gram of dry, cool air by 1 degree Celsius
  • 4.184 J = energy needed to raise the temperature of one gram of water by one degree Celsius
  • 300 J = one person jumping as high as the can (70kg, 40cm on eath)
  • 330 J = melting 1g or ice
  • 360 J = Kinetic energy of 800 gram standard men's javelin thrown at > 30 m/s by elite javelin throwers
  • 1.4 kJ = average energy receive from the sun in 1m²/s
  • 2.3 kJ = vaporizing 1g of water into steam
  • 3.1 kJ = Kinetic energy of world-record men's hammer throw (7.26 kg thrown at 30.7 m/s in 1986)
  • 4.2 kJ = energy release by 1g of TNT
  • 9 kJ = 1 AA baterry
  • 17 kJ = 1g of carbohydrates or protein
  • 38 kJ = 1g of fat
  • 50 kJ = 1g of matter at 10km/s
  • 600 kJ = 1 automobile (2t) at 90 km/h
  • 1.2 MJ = energy of a snack such as a snickers bar (280 kcal)
  • 5.2 MJ = average heat lost by a human in a day
  • 8.4 MJ = Recommended food energy intake per day for a moderately active woman (2000 food calories)
  • 11 MJ = Recommended food energy intake per day for a moderately active man (2600 food calories)
  • 40 MJ = Energy from the combustion of 1 cubic meter of natural gas
  • 42 MJ = Caloric energy consumed by Olympian Michael Phelps on a daily basis during Olympic training
  • 110 MJ ≈ 1 Tour de France, or ~90 hours ridden at 5 W/kg by a 65 kg rider
  • 1-10 GJ = Energy in an average lightning bolt
  • 1.4 GJ = Theoretical minimum amount of energy required to melt a tonne of steel
  • 2 GJ = Energy of an ordinary 61 liter gasoline tank of a car
  • 3.3 GJ = Approximate average amount of energy expended by a human heart muscle over an 80-year lifetime
  • 4.5 GJ = Average annual energy usage of a standard refrigerator
  • 19 GJ = Kinetic energy of an Airbus A380 at cruising speed (560 tonnes at 511 knots or 263 m/s)
  • 88 GJ = Total energy released in the nuclear fission of one gram of uranium-235
  • 240 GJ = Approximate food energy consumed by an average human in an 80-year lifetime (2000 kcal for 80 years)
  • 11 TJ = Energy of the maximum fuel an Airbus A380 can carry (320,000 liters of Jet A-1)
  • 12 TJ = Orbital kinetic energy of the International Space Station
  • 63 TJ = Yield of the Little Boy atomic bomb dropped on Hiroshima in World War II (15 kilotons)
  • 90 TJ = Theoretical total mass-energy of 1 gram of matter
  • 600 TJ = Energy released by an average hurricane in 1 second
  • 100 PJ = Energy released on the Earth's surface by the magnitude 9.1–9.3 2004 Indian Ocean earthquake
  • 170 PJ = Total energy from the Sun that strikes the face of the Earth each second
  • 210 PJ = Yield of the Tsar Bomba, the largest nuclear weapon ever tested (50 megatons)
  • 420 PJ = Yearly electricity consumption of Norway as of 2008
  • 800 PJ = Estimated energy released by the eruption of the Indonesian volcano, Krakatoa, in 1883
  • 5 EJ = Energy released in 1 day by an average hurricane in producing rain (400 times greater than the wind energy)
  • 64 EJ = Yearly electricity consumption of the world as of 2008
  • 500 EJ = Total world annual energy consumption in 2010
  • 800 EJ = Estimated global uranium resources for generating electricity 2005
  • 7.9 ZJ = Estimated energy contained in the world's petroleum reserves as of 2010
  • 39 ZJ = Estimated energy contained in the world's fossil fuel reserves as of 2010
  • 500 ZJ = Approximate energy released in the formation of the Chicxulub2) Crater in the Yucatán Peninsula
  • 5.5 YJ = Total energy from the Sun that strikes the face of the Earth each year
  • 380 YJ = Total energy output of the Sun each second
  • 38k YJ = Kinetic energy of the Moon in its orbit around the Earth (counting only its velocity relative to the Earth)
  • 2.1M YJ = Rotational energy of the Earth
  • 4.2 10e45 YJ = Estimated total mass-energy of the observable universe

The energy of the sound is given by the equation: E = time (s) * area (m²) * intensity (W/m²) or E = time (s) * area (m²) * 10e(-12+db/10). For a person (1m²) absorbing the sound during one second:

  • 20 db = whisper = 0.1 nJ
  • 60 db = normal conversation = 1 µJ
  • 98 db = Large Orchestra = 6.3 mJ
  • 130 db = pain threshold = 10 J

Gravitational

The potential energy due to the gravitational field: E = mass (kg) * g (=10 m/s²) * deltaZ (m) Examples for lifting one object of 1m:

  • 1 dJ = a leaf
  • 1 J = a small apple
  • 800 J = one person

Levitation would need to generate a velocity of 9.8m/s each second. E = 1/2 m v² = 50J/kg. P = 50W/kg. The energy necessary to levitate for one minute for a standard person of 75kg would be 225kJ.

Kinetic

Kinetic energy due to velocity: E = 1/2 * mass (kg) * velocity² (m/s)

  • 0.5 J = 1kg at 1m/s

Food

Energy release by the metabolism:

  • 17 kJ = 1g of carbohydrates or protein
  • 38 kJ = 1g of fat
  • 1.2 MJ = energy of a snack such as a snickers bar (280 kcal)
  • 8.4 MJ = Recommended food energy intake per day for a moderately active woman (2000 food calories)
  • 11 MJ = Recommended food energy intake per day for a moderately active man (2600 food calories)

Combustion

Chemical energy:

  • 40 MJ = Energy from the combustion of 1 cubic meter of natural gas
  • 730 MJ ≈ Energy from burning 16 kilograms of oil
  • 2 GJ = Energy of an ordinary 61 liter gasoline tank of a car
Can I launch a Fireball ?

Let hypothesis that we don't want a combustible but just a source of heat and light.

For a candlelight:

light : 1 candela in all direction = 13 lumens = 2cW/s = 2cJ/s

heat: 80 W = 80 J/s


Just with the every day food

A person eat between 1500 kcal and 3000 kcal = 6-12 MJ, lets take 10 MJ

  • boiling 4l of water from room temperature 20°C
  • lift a canon ball (20kg) up to 50km or throwing it at 1km/s
  • lift a car (2t) up to 500m or trowning it at 100m/s

Using their body reserve

1 kg muscle (protein) = 17 MJ, 1 kg fat = 38 MJ, 1 Kg water at 37°C = 4.2 kJ/°C

Skinny person

50kg = 15kg muscle + 3kg fat + 2kg bones + 30kg water

Reserve energy = 15kg muscle + 3kg fat = 255 MJ + 114 MJ = 369 MJ

Water heat energy = 126 KJ/°C

Athlete

80kg = 40kg muscle + 8kg fat + 2kg bone + 30kg water

Reserve energy = 40kg muscle + 8kg fat = 680 MJ + 304 MJ = 948 MJ

Water heat energy = 126 KJ/°C

Fat person

100kg = 28kg muscle + 30kg fat + 2kg bone + 40kg water

Reserve energy = 28kg muscle + 30kg fat = 476 MJ + 1.1 GJ = 1,6 GJ

Water heat energy = 168 KJ/°C


  • 10e−1 J-dJ-decijoule
  • 10e−2 J-cJ-centijoule
  • 10e−3 J-mJ-millijoule
  • 10e−6 J-µJ-microjoule
  • 10e−9 J-nJ-nanojoule
  • 10e−12 J-pJ-picojoule
  • 10e−15 J-fJ-femtojoule
  • 10e−18 J-aJ-attojoule
  • 10e−21 J-zJ-zeptojoule
  • 10e−24 J-yJ-yoctojoule
  • 10e1 J-daJ-decajoule
  • 10e2 J-hJ-hectojoule
  • 10e3 J-kJ-kilojoule
  • 10e6 J-MJ-megajoule
  • 10e9 J-GJ-gigajoule
  • 10e12 J-TJ-terajoule
  • 10e15 J-PJ-petajoule
  • 10e18 J-EJ-exajoule
  • 10e21 J-ZJ-zettajoule
  • 10e24 J-YJ-yottajoule
  • start/miscellaneous/energy.txt
  • Last modified: 2023/11/06 14:11
  • by aretis