Physics is about the world and everything in it. Physics describes that world and the kinds of things that take place in it. Sometimes, however, physics seems like an imposi- tion from outside — a requirement you have to get through. That’s a shame, because it’s your world that physics describes. Under the burden of physics problems, though, things can get tough. That’s where this book comes in, because it’s designed to let you tackle those problems with ease. Kirchhoff’s laws? No problem. Carnot engines? No worries. Everything’s here in this book. After you’re done reading, you’ll be a problem-solving pro.