A lever is used to pry the lid off of a wooden crate. The worker applies 1150 J of work to the lever, and the lever does 850 J of work to the lid. Calculate the efficiency of the lever.

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

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

The chart shows daniela’s run through her race. what is her velocity? 1.5 m/s 2 m/s 2.5 m/s 5 m/s