A force of 100 N is exerted on a 50kg safe to move it across a room. Describe the acceleration (or change in velocity) and it’s value in m / s2 ?

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

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 experiment was repeated many years later but the gases were mixed in a different type of container. a white solid was obtained which was xenon fluoride. predict whether you think 1) krypton and 2) radon will react with fluorine. explain reasons for your predictions