When a perfume bottle is opened, some liquid changes to gas and the fragrances spreads around the room.

Which material produces static charge when rubbed?

Lin yao looks at the back of a spoon. how should she describe her reflection? upside down and smaller upside down and larger right-side up and smaller right-side up and larger

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?