For one, the '2' with the 2pi is squared along with the pi (as its written above, it looks like only the pi is squared), so the demoninator should be 4pi^2. The period T should be converted from 6.04 hours to seconds, and to get R, the cube root of the right hand side of the equation must be...
This is a projectile motion problem. The baseball has two components to its velocity as it flies through the air: a horizontal component that stays the same (since there are no forces that act horizontally) and a vertical component that changes (because of the force of gravity). You are given...
Many articles explain that data from WMAP were used to establish an age of 13.7 billion years for the universe. Could someone explain precisely how '13.7 billion' comes out of the data? What formulas/models/theories/etc. were used, how were they used, etc. ?
As a refresher exercise in modern physics, I want to derive Wien's displacement law:
\lambda_{max}T=2.898x10^{-3}mK
from Planck's formula:
R(\lambda)=(\frac{c}{4})(\frac{8\pi}{\lambda^4})(\frac{hc}{\lambda})(\frac{1}{\exp^(\frac{hc}{\lambda\kT})-1})
by differentiating R(\lambda) and...
I've been reading Singh's Big Bang book, and towards the end he mentions that the CMBR was used to compute the relative speed of the Milky Way Galaxy, roughly 1,000,000 mph. This seems to suggest that the CMBR can be used as an absolute reference frame for any observer in the universe...
I recall the story about the Antarctica cooling, and in conjunction with the warming of the Arctic, this led me to think that there may be an imbalance in CO2 in the hemispheres as one possible explanation. One side of planet can warm, and the other side can cool, but the average can still...
I was wondering if anyone has measured differences in concentration by region. It would make for an interesting investigation to see if CO2 is more concentrated in the northern hemisphere vs. southern.
The most distinctive feature of the poles is that they are white, which means that some...
I recently read an article that stated that the Arctic ice cap is melting at a geologically rapid rate and that the air temperature over the North Pole is doing the same. The link is below:
http://www.msnbc.msn.com/id/9527485/
I was wondering if any data have been collected regarding CO2...
There was an article written in Skeptical Inquirer about NDE's not too long ago. The conclusion by neurologists was that NDE's are nothing more than the effects of changing brain biochemistry during the dying process. It might be available online at www.csicop.org.
I would also like to see...
I was perusing the sci/tech articles at MSNBC and came across this article:
http://www.msnbc.msn.com/id/7047871/
The physicist in the article suggests that the acclerated expansion of the universe is caused by gravitons "leaking" into extra dimensions (borrowing from string theory). This...
I have no background in economics or anything, but I was wondering how severe the economic/social impacts would be if the U.S. were to go bankrupt. What would be the most likely course of action by the government or other governments in the face of bankruptcy? How would it affect day-to-day living?
Well, I happen to be a teacher who uses MI in the classroom as a tool to help students learn. And that's really the main motivation behind MI theory: to help students learn. No harm in that is there?
Given the learning of a new skill, the individual with a strong intelligence related to the...
Based on brewnog's idea, I used some geometry and the law of cosines to derive an *estimate* of the radius of curvature as a function of the steering wheel angle and wheel base.
s = wheel base
a = steering wheel angle
n = steering ratio (e.g. for 16:1, n = 16)
r = radius of curvature, in...
Is there a formula which relates the angle of a steering wheel from normal position (theta) and the radius of curvature (r) of the arc that an average vehicle moves through? (assuming power steering, since that's the most common)
Such a formula would be useful in calculating centripetal...