Atrain is moving with a speed of 50 miles per hour. a man standing in the rear of a train car throws a ball toward the front of the train with a speed of 10 miles per hour. if a stationary observer outside the train sees this happen, what speed is the ball moving with?

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.

What happens when you slowly pulled the carboard?

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?