Asled of mass 15 kg slides across the ground with a friction force of 80.85 n. what is k between the sled and 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

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

How do you tell if someone actually cares about you? and just say they do?