I am kind of studying physics on my own now.
I choose University Physics (13th Edition) for myself,is it fine?
I am also studying Calculus using Thomas' textbook.

http://www.amazon.com/University-Physics-13th-Edition-Young/dp/0321696891/ref=sr_1_1?ie=UTF8&amp;qid=1352260382&amp;sr=8-1&amp;keywords=university+physics+13th+edition


Question: Will enclosing my porch keep my house warmer?
Answer: If your porch gets any sun, it should help. My dad enclosed his each fall and opened it back up in the spring to let the breeze through. Worked great, but this was in the high desert where it would be sunny and below freezing at the same time.