Recent content by HummusAkemi

So the internal energy of a system changes if work or heat is transferred between itself and its environment. Say you compress a gas and therefore do work on it, increasing its internal energy. According to Newton's 3rd law, shouldn't the gas also do work on its surroundings. How come this isn't...

Thanks, you two. Ok, I think I get it now

I pry two magnets apart. The magnets attract each other. Say they exert a constant force F on each other. I exert an equivalent force F on each in the opposite direction and pull them apart a distance d (pull each of them d/2 distance). So I have done positive work Fd in total and increased the...

Hi, For a perfectly competitive firm, the demand curve is horizontal, and yet how do you have a downward sloping demand curve for the whole industry, assuming you're using horizontal summation? The curve should get flatter if you're summing them, not steeper. Also, is there any marginal...