Joules To Meters Per Second

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The joule (symbol J) is the SI unit of energy—a measure out of the capacity to do work or generate heat. One joule equals the work washed (or free energy expended) by a force of one newton (Northward) acting over a distance of i meter (chiliad). 1 newton equals a force that produces an acceleration of one meter per second (s) per second on a one kilogram (kg) mass. Therefore, 1 joule equals one newton•meter.

Expressed in equations:

$E = \ell\, F \quad\hbox{and}\quad F = M\, a$

The mechanical quantities involved take the SI units:

$E\; [\mathrm{J}], \quad \ell\; [\mathrm{m}], \quad F\; [\mathrm{N}], \quad M\; [\mathrm{kg}], \quad a\; [\mathrm{m}/\mathrm{s}^2].$

It follows that J (joule) is expressed in SI basic units as:

$\mathrm{J} = \mathrm{m}\cdot\mathrm{N} = \mathrm{m}\cdot \mathrm{kg}\cdot \mathrm{m}/ \mathrm{s}^{2} = \frac{\mathrm{m}^2\cdot \mathrm{kg}}{\mathrm{s^2}}$ .

'Joule' is variously pronounced 'jool' (rhymes with 'jewel') or 'joul' (rhymes with 'jowl').

I may also use electrical units to define the joule. One joule measures the energy released by a electric charge of one coulomb dropping ane volt in absolute value of electric potential. The amount of energy delivered by a one watt source of power in one second is 1 Joule. The joule is also used to measure thermal energy. I calorie of heat is the equivalent of iv.186 J.

The joule is named for James Prescott Joule (1818 - 1889), who studied the relation between mechanical and estrus free energy discovered earlier past count Rumford.

1 joule represents a relatively pocket-sized amount of free energy; it takes roughly 100,000 J (10⁵ J) to heat a loving cup of h2o from room temperature to its boiling betoken nether standard weather. Often, kilojoules (kJ) are used, kJ = 10ⁱⁱⁱ J.

[edit] Other units of energy convertible to joules

Whereas the joule is the standard SI unit of energy, many other units of energy, all convertible to joules, are used in particular circumstances. Those include: erg; foot pound; watt second; watt hr; kilowatt 60 minutes; thermochemical calorie; International Table calorie; kilocalorie; thermochemical Btu; therm; quad; cubic meter natural gas; ton of oil equivalent; ton of coal equivalent; ton of TNT; electron volt; hartree; changed meter; inverse second; kelvin; kilogram.^[1] One kilogram (kg) of mass is equivalent to exactly 89,875,517,873,681,764 joules (according to Eastward=mc ² with m = 1 kg and speed of light c = 299,792,458 m/s).^[i]

[edit] Practical examples

The amount of energy i utilizes in lifting a cup of water from the table to one'south mouth equals approximately 1 Joule.^[ii]
Ane calorie (1 1/one thousand of a kilocarie of food consumed or metabolic energy expended) equals 4.186 J.^[2]
A baseball pitched by a fast Major League pitcher has a kinetic energy of approximately 230 J.
Ane "dietary Calorie" (as used in the United states to designate a kilocalorie) is 4186 J (4.186 kJ).
One gram of gasoline releases most 50 kJ on combustion in air.
A small-scale car (most 1200 kg) travelling at 65 miles per hr (105 km/h) has a kinetic energy of 1 megajoule (1 MJ).
1 "kilowatt-hr" is 3.six MJ.
Ane ton of TNT releases 4.184 GJ on exploding.

[edit] References cited

↑ ^1.0 ^1.1 Elert Thou. (1998-2008) Free energy: The Physics Hypertextbook™. A Work in Progress. Fair Employ Encouraged.
↑ ^ii.0 ^2.one Foland Advertizement. (2007). Energy. Chelsea House Publications. ISBN 978-0791089309.