10,100
34
The energy content of coal can vary, but on average, one kilogram of coal contains around 24 megajoules (MJ) of energy.
4 joules = about 1 ton of coal
7
7
7
Here you must calculate 1 / 0.365.
Approx. 3 000 t coal (for the complete nuclear fission of 1 kg of the isotope 235U).
Use the formula PE = mgh (potential energy = mass x gravity x height). If mass is in kilograms, gravity in meters/second2 (the value is about 9.8), and the height is in meters, the answer will be in joules.
A joule is defined as 1 kg being lifted 1 meter. Ergo 14 kilograms moved by 1 meter takes 14 joules.
Energy is not measured in kilograms
50.75 joules of energy equates to about 12.1 calories.