If i add 5 protons, 4 neutrons, and 2 electrons what is mass weight

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

According to coulomb's law, how would the electrical force between particles change if the product of their electrical charge increased?

When would a bouncy ball have the most potential energy