  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.
Cunningham, an automobile company, built the next model. The T1 Light Tank of 1927 was a 7.5-ton vehicle powered by a 105-horsepower engine, giving it a speed of 20 mph. The engine was in front, with the drive in the rear. Its turret mounted a .30-caliber machinegun.