Muzta
Lord of the Dance
Negative Association was the name of my hot tub
Ballkicks: (+140 / -19)
Posts: 1993 (0.289)
Reg. Date: Apr 2002
Location: New Hampshire
Gender: Male |
(Originally posted on: 05-04-09 12:01:13 PM)
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I'm going to be graduating in a few days and I thought I would take this time to reflect on the worthless tidbits I have acquired throughout the years of my college education
1. A kilogram is a unit of mass, a pound is a unit of force. Therefore you can not actually convert from one to the other.
A "slug" is the actual unit of mass in English Standard, and an object's "weight" can be found by multiplying it's mass by the acceleration due to gravity (32.2 ft/s). [url=http://en.wikipedia.org/wiki/Weight]Weight [/ur], is a term describing relative force, therefore it is incorrect to describe an object's weight in kilograms
2.Bernoulli's equation is not what makes planes fly
The conventional description of how plans fly is that the shape of a wing causes air going over the top to accelerate and therefore drop in pressure resulting in a higher pressure below the wing then above, generating lift. This is incorrect.
The actually reason a plan flies is that the wing imparts a downward force on the fluid as it pass through it, due to it's geometry. As a result, as part of a momentum balance, the plane's wing then have a reacting force upwards.
3. The point of a wheel that is contacting the surface on which it is rolling has zero velocity with respect to that surface (ideally). An easy way to demonstrate this is role an object with your arm, notice that the object is only rolling half the distance that your arm is traveling. The top part of the object is traveling with the same velocity as your arm with respect to the ground, the bottom part has zero velocity with respect to ground, so the average velocity of the object is one half of that of you're arm. This means that when your traveling down the highway at 60mph, then contact point of the wheel at any instant has zero velocity, and the upper most part of the wheel is traveling at 120mph. This is why fenders are important.
and now I'm bored...your turn
"Nice guys finish last, then we sleep in" - Duk's Sig
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