Though most of the galaxies in the universe are receding from Earth, some are observed to be moving toward us. Suppose a galaxy is moving toward Earth with a speed of 3485 km/s and emits light with a frequency of 4.000 X 1014 Hz. What is the frequency of the light when it reaches Earth?

Identify the type of heat transfer occurring when chocolate melts in your hand

Which of these are physical changes in matter? check all that apply. boiling water a pencil being sharpened exploding dynamite freezing water rotting cheese

What belongs in the areas marked x and y? x: the internal energy of a piston system increases as heat is added and rises to a cool area y: as thermal energy is added to a container, some of the energy is lost to the environment x: as thermal energy is added to a container, some of the energy is lost to the environment y: the internal energy of a piston system increases as heat is added and rises to a cool area x: a cold spoon placed in hot liquid gets warmer y: thermal energy is converted to light energy x: thermal energy is converted to light energy y: a cold spoon placed in hot liquid gets warmer