Toyota’s Mirai fuel-cell car stores 5.0 kg of hydrogen gas at a pressure of 10,000 pounds per square inch (psi). Determine the energy content of this much hydrogen, and compare with that of a conventional car’s 15 gallons of gasoline.

Which best represents the law of conservation of mass ?

If the new moon happens on january 15th, what shape will it be on february 6th?

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?