Which is a device that stores electric charge by separating positive and negative charges?

Prompta snowboarder stands at the top of a hill and decides to see if he can increase his speed on his next trip down the slope. describe one thing the snowboarder could do to incrlase his speed on the slope. explain why this would cause his speed toincrease relate one of newton's laws to this problem.

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?