  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.
The first submarine was developed by Cornelis Drebbel, a Dutchman, in 1620. The first submarine that went into action was the Turtle, developed by David Bushnell in 1776. It went in action, but never sank a ship. The first submarine to do that was the Hunley in 1864. (With the loss of the submarine, and its entire crew). The first modern submarine that went into service was the Holland, invented by John Holland in 1903.