Recent content by brum

The formula I think you want is very simple: a_{centripetal} = v_T^2 / r That's the centripetal acceleration, whose direction is always toward the center of the circle. And the velocity is the tangent velocity. If you want to use angular velocity in the equation instead, use the...

Here is a problem that I am having trouble with. Let f be a function such that: Limit as h -->0 [f(2 + h) - f(2)] / h = 5 (essentially that: f ' (2) = 5 ). It then asks: which of the following must be true? 1) f is continuous at x = 2. 2) f is differentiable at x = 2. 3)...

woah I've never heard of this one! could you possibly point me to a site that has more info on this? thanks for the help, Chronos!

I am in a college-level Astronomy course this summer, and my final project topic is on the fate of the universe. I must present this in a creative, entertaining way for the class. But I also would like to have up-to-date, sound science in there, too. What I would like from you guys is some...

5 literd bottle, a 7 litered bottle and a tank, how can i get 4 lits of water in the end if I start by pouring water from the tank into the 5 liter bottle first ? 1) Pour the 5 L into the 7 L bottle. 2) Fill the 4 L. 3) Pour the 4 L into the 7 L (with 2 L left in the 4 L). 4) Pour the...

The SI unit for weight may be the Newton, but it's perfectly legit to use the pound (lb) for weight. If someone uses the pound to describe an object's weight and not the Newton, so be it, there's nothing objectable to that. You can very easily switch between pounds and Newtons with a simple...

BluE -- your math teacher should be giving you the answers plus the explanations along with your test sheet in the days after each Math League (or at least that's what happens at my school)

I am now thinking of taking two 4-unit courses 1) http://www.ssp.harvard.edu/2004/academics/courses/astr.jsp#s-35 (Fundamentals of Contemporary Astronomy: Stars, Galaxies, and the Universe) 2) http://www.ssp.harvard.edu/2004/academics/courses/stat.jsp#s-100 (Introduction to Quantitative...

Sorry, I wasn't very clear. I have a 4.0 on an unweighted scale, and a 4.08 on a weighted scale (only one semester so far has had weights). My high school is not as liberal with its weighted classes like cookiemonster's. Only academic classes (not pottery, hah) can have weights. For...

thanks for the info! Yes, my high school has a "youth options" program where students can take classes at UWM or some other nearby college if that course is not offered at the high school. And the school district pays for the tuition, as well. If I don't take calculus this summer, I...

Calculus I & II (BC, roughly) --- can it be done in 8 weeks? I was recently accepted to the http://www.ssp.harvard.edu , where I will take either two 4-unit courses, or one 8-unit course over the 8 week period during the summer. I am now at the stage of choosing a course (or 2, if I do two...

I, too, am looking at colleges right now (with the intent of going into physics). My top 5 right now are (in order): 1) Stanford 2) MIT 3) Harvard 4) Princeton 5) UW - Madison (cuz it's close & a fall back school) I've managed to keep a 4.0 throughout high school thus far (middle of...

woah! elaborate! but in this case, information truly would not be moving faster than c, right?

We all know that, as an object rotates about an axis in constant circular motion (\omega is constant), the linear velocity increases the further the object is from the axis (v increases as r increases, v = \omega * r) Let's say you build a scyscraper. The taller the skyscraper, the faster...

likewise, the light would bounce of the top of the box. and the sides. (and thus, no net force) on the parachute, that's a different story. ever see one of those spinning things in a glass dome, about the size of your fist, that has 4 spinning squares rotating around an axis? and the...