If the polar ice were to melt they would become less reflective therefore increasing the heat on Earth. True or false?
This is science..

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° 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.)

Which object is most likely represented by a dot?

Which statement best explains why the overall charge on an atom is zero?