840 electrons are transferred from a neutral charge rod to neutral charged silk

Part a what is the magnitude of the new charge of the silk

Part B is a new silk positively or negatively charged

Two questions please

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)

Area around a charged object where the objects can exert a force on another charged objects is an electric

The largest observatory complex in the world is on mauna kea, the tallest mountain on earth. what are some factors astronomers consider when selecting an observatory site? don’t forget practical ones. should astronomers, for example, consider building an observatory on denali (mount mckinley) or mount everest?