You are in a speedboat on a river moving in the same direction as the current. the speedometer on the boat shows that its speed is 20 km/h. however, a person on the shore measures the boat's speed as 23 km/h. how is this possible?

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present