Category Archives: General Science

Physics Reminder

Alan Boyle has a little piece today about the elevators in the tallest building in the world. But this bit is misleading:

Imagine riding in a car going almost 40 mph (60.6 kilometers per hour). Not that impressive, right? But now imagine going that same 40 mph … straight up.

That gives you some idea how elevator riders must feel in the world’s tallest building, Taipei 101.

Actually, you can’t feel speed at all. There is no difference in sensation between a twenty mph elevator and a forty mph elevator, other than perhaps vibrations transmitted through the cables and contact with the shaft. Acceleration is what you feel, so the difference is how long it takes you to get up to speed (and back down from it), not what the top speed is.

Similarly, he writes:

The cars go faster on the way up than on the way down

Is There A Mycologist In The House?

One familiar with the southeastern Florida ecology?

Sorry, I’m still too discombobulated to be able to post pics, but I noticed when I went out to survey hurricane damage this morning that one of the changes overnight was a lawnful of mushrooms. There seem to be two varieties (I’m assuming that they aren’t variations on the same species). One is flat and gilled, and the other has a circular head. Both are white, and as the day progressed, they developed brown areas on top.

Anyone know what they are, and if having them for dinner would result in delicious nutrition, or a trip to the emergency ward?