DEKA Research and Development interview questions

I was initially contacted by HR and she set up a phone interview with a Test Manager for the next week. Spoke with the test manager who asked mostly basic resume type questions and gave me a job description. 2 days later, HR emailed to schedule an in person interview in New Hampshire. The interview consisted of 4 test engineers and managers in a room asking questions. The first 45 minutes was typical interview questions. This was followed by a white board interview, with questions ranging from basic physics to heat transfer. They talked me through some of the problems that I had difficulty with, and gave me hints as to where to direct my thinking.