There were 600 gigatons (106 tons) of carbon in the atmosphere in 1850. how many gigatons accumulated in the atmosphere each year due to human activity? (hint: take the percent we are emitting each year and multiply it by 600; remember 1% = 0.01)

An element becomes a positively charged ion when itloses protons.loses electrons.gains electrons.gains neutrons.

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?

In the illustration, which two simple machines are being used to enable the student to reach the door? a. inclined plane and pulley b lever and wheel-and-axle c pulley and lever d wheel-and axle and inclined plane