How can a passenger tell when the seatbelt is properly used? when it clicks. when it is loosely draped across the lap. when it crossed the sternum and is snug across the lap. when the seatbelt is very tight across the sternum and lap?

Which two statements are true about a system? a system is a group of objects analyzed as one unit. energy that moves across system boundaries is conserved there's only one way to define the boundaries of a system all systems are made by humans