Select all the correct answers.

which actions show that mixing or separating occurred?

purifying water with a carbon filter

a soda fizzing when its cap is opened

a metal mixed with a very small amount of a nonmetal to make a metallic alloy

using frozen carbon dioxide to create fog

What is the rate of change in a objects position?

Frequency of electromagnetic waves that a radio station is assigned is called

On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?