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If a comet with this speed fell to the Earth it would gain another 63 MJ/kg, yielding a total of 2655 MJ/kg with a speed of 72.9 km/s. Since the equator is moving at about 0.5 km/s, the impact speed has an upper limit of 73.4 km/s, giving an upper limit for the specific energy of a comet hitting the Earth of about 2690 MJ/kg.
Energy densities table Storage type Specific energy (MJ/kg) Energy density (MJ/L) Peak recovery efficiency % Practical recovery efficiency % Arbitrary Antimatter: 89,875,517,874: depends on density: Deuterium–tritium fusion: 576,000,000 [1] Uranium-235 fissile isotope: 144,000,000 [1] 1,500,000,000
The following unit conversions may be helpful when considering the data in the tables: 3.6 MJ = 1 kW⋅h ≈ 1.34 hp⋅h. Since 1 J = 10 −6 MJ and 1 m 3 = 10 3 L, divide joule / m 3 by 10 9 to get MJ / L = GJ/m 3 .
MJ/kg (Wh/kg) MJ/L (Wh/L) W/kg Wh/$ ($/kWh) % %/month years Lead–acid: SLA VRLA PbAc Lead: H 2 SO 4: Lead dioxide: Yes 1881 [1] 1.75 [2] 2.1 [2] 2.23–2.32 [2] 0.11–0.14 (30–40) [2] 0.22–0.27 (60–75) [2] 180 [2] 5.27–13.55 (74–190) [2] 50–92 [2] 3–20 [2] Zinc–carbon: Carbon–zinc Zinc: NH 4 Cl Manganese (IV) oxide: No 1898 ...
The watt, kilogram, joule, and the second are part of the International System of Units (SI). The hour is not, though it is accepted for use with the SI.Since a watt equals one joule per second and because one hour equals 3600 seconds, one watt-hour per kilogram can be expressed in SI units as 3600 joules per kilogram.
A kilowatt-hour (unit symbol: kW⋅h or kW h; commonly written as kWh) is a non-SI unit of energy equal to 3.6 megajoules (MJ) in SI units, which is the energy delivered by one kilowatt of power for one hour. Kilowatt-hours are a common billing unit for electrical energy supplied by electric utilities.
kilowatt-hour per 100 kilometres: kilowatt-hours per 100 kilometres: kilowatt-hour per 100 kilometers: kilowatt-hours per 100 kilometers: MJ/km kWh/mi: Kilowatt-hour: kWh/100 mi: kW⋅h/100 mi: 22.3694: kilowatt-hour per 100 miles: kilowatt-hours per 100 miles: mpge: Miles per gallon gasoline equivalent: MJ/100 km: MJ/100 km: 10: megajoule per ...
This Wikipedia page provides a list of units of energy used in the template for converting measurements.