An object with a mass of 70 kilograms is supported at a height of 8 meters above the ground, what's the potential energy of the object with respect to the ground?

The solar panels used by mark function because of the photoelectric effect. light shines on the cells causing electrons to be ejected from the metal, which produces an electric current. at night on mars, no light will fall on the solar cells and no electric current will be generated. according to your notes, what type of light is typically needed to cause the photoelectric effect? a)visible b)ultraviolet c)infrared

Select all the correct answers. which three statements about electromagnetic radiation are true?

Sunidhi made a study chart about changes in states of matter. which headings best complete the chart?