Sharp Definition and 55 Threads

Homework Statement An object and a screen are separated by 20 cm. A convex lens is placed between them, 5 cm from the object. In this position it causes a sharp image of the object to form on the screen. What is the focal length of the lens? The Attempt at a Solution wouldn't it just...

For any of you thinking of trying this at home, let me tell you this is not fun. I accidentally jabbed myself in the eye a couple of weeks ago, and after a couple of minutes of screaming in pain, I thought it was over. But last week, I started having this hard eye-twitch and some pain in my...

http://www.washingtonpost.com/wp-dyn/content/article/2005/04/26/AR2005042601623.html Why is it thought that aggression will lead to less terror? Particularly pre-emptive aggression? This is from a few months ago, and I don't know if it has been discussed already. I searched for relevant...

Due date: TOMORROW! 300 word limit There are optimists who believe that technology will make human immortality possible, even allowing humans to escape the universe once its collapse is inevitable. There are pessimists who believe that technology will lead to weapons that will wipe out human...

I am thinking about taking a C# course. The only prerequisite recommended is a C course, which I took this summer, but I know very little about .net so I am not sure how I'll adapt to C#. I was planning to take C++ this fall but the enrollments are so low I am worried the class might get...