Tipler and the 4th edition modern Physics book

[maxletap]

I had a couple of questions from the modern physics book 4th ed. by tipler.

I cant seem to solve some of the problems and some just dont make sense to me. Chapter 4, problems: 16, 38, 43, and 49 are the ones in question

Any help would be appreciated Thank you...

[James R]

You'll probably get more replies if you post the problems, since few people are likely to have a copy of the book.