  The electron and the proton have a negative electrostatic charge and a positive electrostatic charge respectively. Each charge-and the force associated with that unit of charge-is constant-and equal.(The electron and proton have equal, but oppositely polarized, electrostatic charges.) But there is more. The electron and the proton have a negative electrostatic charge and a positive electrostatic charge respectively. Each charge-and the force associated with that unit of charge-is constant-and equal.
The start of life for the tank did not bode well. The first model came off the factory floor on September 8th 1915. On September 10th, its track came off. The same happened on September 19th when government officials were watching.
1916 - The first tank prototype, nicknamed mother, was created by Britain during World War 1. 1926 â Robert Goddard launches the first liquid-fueled rocket. 1935 â First flight of the DC-3, one of the most significant transport aircraft in the history of aviation; 1939 - First jet engine powered aircraft, the Heinkel He 178, takes flight.