What are the products of the combustion of a hydrocarbon? carbon and oxygen carbon dioxide and water carbon and hydrogen carbon dioxide and hydrogen

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?

A6.0-kilogram cart initially traveling at 4.0 meters per second east accelerates uniformly at 0.50 meter per second squared east for 3.0 seconds. what is the speed of the cart at the end of this 3.0 second interval? (1) 1.5 m/s (3) 3.0 m/s (2) 5.5 m/s (4) 7.0 m/s

What practical value did astronomy offer to ancient civilizations?