A florescent light tube usually contains what?
A a vacuum
B oxygen
C. Mercury vapor
D. Light emitting diodes

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

Blank liquids and gases exert a buoyant force on objects placed in them

An atom that has gained or lost electrons is called an _