Science & Mathematics - 2 December 2007

2007-12-02 00:42:10 · 1 answers · asked by ali 1 in Geography

In my company we are trying to understand how can you reverse the polarity of an alkaline battery and then come up with a solution for that. We have a product that uses three AA batteries (the brand is Energizer Industrial...but it's really a normal battery). The thing is that, in some cases, we have found that the customer gets it dead on arrival. When we get the product back for investigation and we test the batteries, we find that two are somewhere in the 0.8 V range, but there is one that is always like -0.2 V. And it's always the same one (the one at the bottom - the battery housing is vertical). Nobody has been able to really answer how is that possible. We called Energizer and they cannot figure that one out either. I checked in several forums an found that customers have also had the same problem with a certain model of Canon camera. So this proves that it can happen. But, how does it happen? Why does it happen? What could solve the problem?

2007-12-02 00:39:48 · 5 answers · asked by JDL 1 in Engineering

I understand the circadian rhythm quite well, but I'm confused about circannual rhythms. I know the circadian rhythm involves animals being light sensitive at certain times of day.
Animals who live in areas with little seasonal variation in day length (eg. the equator) use the circannual rhythm to tell when to migrate. But what exactly is the circannual rhythm? How does it work?

2007-12-02 00:35:26 · 1 answers · asked by Smiler 3 in Biology

cause i think it would some bigass earthquake

2007-12-02 00:34:47 · 6 answers · asked by plolochufuu 2 in Earth Sciences & Geology

How do you perform a G-test on the following data?

Category | Observed
A___________12
B___________6
C___________9

The formula I have for G-test is

G = 2 x [sum of]O ln (O/E)

where O is the observed and E is the expected (9)

And to get G for the data apparently you divide by a correction factor:

Correction factor: 1 + [(number of categories)² - 1]/6(number of observed frequencies)(degrees of freedom)]


But at the end I got G to be -0.206. Surely it can't be negative? The critical value for 5% significance level at 2 degrees of freedom is 5.99.

2007-12-02 00:24:38 · 3 answers · asked by Gabriel H 3 in Mathematics

2007-12-02 00:18:56 · 12 answers · asked by Anonymous in Astronomy & Space

I've always heard the temperature had to be certain degree for it to snow.. Is this true, and what temperature does it have to be?

2007-12-02 00:17:34 · 9 answers · asked by cleotis 1 in Weather

the Question is ....

___________ elements suck as gold, silver, nickel, and iron are minerals made up of only one atom.

2007-12-02 00:11:42 · 6 answers · asked by Anonymous in Chemistry

2007-12-02 00:08:41 · 4 answers · asked by Anonymous in Mathematics