Acar of mass m1 stopped at a traffic light is rear-ended by a car with mass m2. the cars become entangled. the second car was moving at a velocity of v2 before the collision. what is the kinetic energy of the system after the collision?

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

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

Ateacher gives students four liquids commonly found in the kitchen - vinegar, apple juice, dish detergent, and milk - and ph indicator strips, which measure acidity. the teacher asks the students to put the liquids in order from most acidic to most basic. what type of investigation could the students conduct to determine the correct order for the liquids?