Hot air is less dense than cool air, so hot air will rise above cool air. Increasing the air temperature inside a
hot air balloon makes it lighter than the surrounding air, so the balloon can lift up. The density of hot air is
about 0.25 kg/mº less than that of cool air, which means a cubic meter of hot air can lift about 0.25 kg.
What is the minimum volume of hot air needed to lift a hot air balloon carrying 500 kg?

One day as your professor is driving to work, another driver runs through a red light and hits his car. the professor is shaken up but survives the accident. however, the next time he starts to enter the intersection,he becomes nervous and fearful. soon,he starts going to work via another route to avoid the intersection even though this route adds twenty minutes to his commute in each direction. according to the principles of classical conditioning, why does the professor become scared of the previously harmless intersection? what can he do about this, as going via other route is very time consuming? be specific. break down the situation into its parts and show how the principles of learning apply.

Hin t in the section titled, "what can be done? " of "battling the digital jolly roger," what is one of the problems caused by piracy that the author lists? he section titled, "what can be done? " of "battling the digital jolly roger," what is one of the problems caused by piracy that the author lists? ow does the writer's point of view in "the completely free market" affect the credibility of the article? a. it's written in the third person, which allows the author to examine all sides of the debate. b. since it's written in the first person, it doesn't objectively present all sides of the argument. c. since it's written in the second person, it puts the reader in the writer's position, and gives the reader more to consider from this perspective. d. it's written in the first person, but is conducted as an interview with several different sources, providing a full-circle debate.

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