An empty can of mass 120g rests on top of a fire and explodes into three, fragments. One 30g fragment travels east at 60m/s and another 20g goes south at 100m/s. Calculate the velocity of the third piece.

True or false: the revolution of the earth creates day and night as it rotates around the sun

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

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity