The answer is A. <span>Some work input is used to overcome friction. </span>
You need to know the specific heat capacity of air.
Then energy needed = 0.005 x sp.heat.cap x 10
A nebula is gas, dust, and other things that form and form some sort of clould like thing. It also looks cool because of the colors it produces. I'm sure you could do a web search to find more about it, I don't take astronomy hahaha
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