What is the maximum size and number of directory levels for an encrypted zip file? I would like to encrypt the entire directory structure (~8 GB) on my portable USB hard drive without losing the organizational structure.
I've been very pleased with the SmartDisk USB 2.0 60 GB. It has enabled the carrying around and quick access all of my work, school, and home backup info (much better than the occasional backup CD). The advantages of this drive are that it does not need a separate power source and that it is...
What are MA and OpenDocument? It sounds like you feel that .pdf will survive. By the way, I have a lot of VBA functions and subroutines built into Excel (simplifies the GUI). What is the best route for those files, although I will keep working Excel copies in the meantime?
Hopefully when...
What is the outlook for backwards compatability 10-20 years into the future? Right now I have a huge amount of articles, presentations, assignments, and excel spreadsheets stored on my computer. The information is frequently backed up to a portable hard drive. The primary file extensions are...
Right now I am using a SmartDisk FireLite 60 GB USB removable hard drive to store information from work and home. Does anybody know how to password-protect the entire disk or select folders on the disk?
There are a few software tools on the market, but I was hoping somebody has some personal...
The GRE tests your knowledge of English words, but you have a better shot if you know the common Greek and Latin roots. There were many words that I had never even seen before, and I had scanned through the words on the Kaplan review CD. That's why it's helpful to be familiar with Greek and...
The Kaplan book with a CD was helpful. I went through the review modules on the CD and felt pretty well prepared. On the verbal section, I swear that the test is making up words as you go (knowing Greek and Latin is more effective than knowing words in general).
That was my only preparation...
GRE Verbal - Vocabulary test (kicked my butt)
GRE Math - Simple math, but watch out for trick questions... know that X^2=4 can have two solutions; understand the different types of numbers, and review the rudimentary geometry formulas; use trial and error if you get stuck
Intuitively, a negative covariance between the two variables seems like it would result in a sum with less variance than if the variables were independent (zero covariance). Because the variables are "moving in different directions" it is more challenging for the observations of the sum to...
Building on the topic...
Have you ever had a cup of lemonade on a glass table with a pool of condensation around the base of the cup? (in other words, a seal)
There is a "sticking force" that you have to overcome to release the cup. Is that due to the pressure * area integral that has...
That's true as long as the fluid exerts a force on the entire surface area (i.e. not attached to or sealed against another object). The summation of pressure*area across the entire surface area is a more robust solution, but looking at the weight of the fluid displaced is a good enough answer...
You could get a "brute force" answer by using Monte Carlo simulation to combine the distributions of winnings for each amount of correct numbers, as suggested previously. "Crystall Ball" is a useful Excel-based tool for Monte Carlo.
This is true if you assume constant air density versus elevation. Even if a density gradient is allowed, however, the difference would be very negligible. The net force would be very slightly upwards.
If there were a perfect seal, however, the net atmospheric force would be in the downward direction at a magnitude of force = atmospheric pressure at top of book * area of cover.