This is a reply to ttess (posting #1)
Weight is a force and as we know force = mass * acceleration, (where acceleration = 9.80665 meters / sec²).
A mass of 1 kilogram on the Earth's surface has a force of 9.80665 Newtons.
Basically, we know that objects don't need velocity to have weight (or...
Maybe I'm joining the discussion a bit late here, but perhaps I can offer some help.
The equation you need is:
mass = (4 * PI² * r³) / (G * t²)
where mass ('m') is in kilograms, radius ('r') is in meters) time ('t') is in seconds and G = 6.674 * 10^-11 m³/kg*s²
time ('t') should be in seconds...
Thanks for the alert Mark44.
I've had my own website for about 20 years and I guess I haven't kept up with the latest "fancy-schmancy" computer tricks.
(Heck, my computer runs on coal! LOL)
Thanks for the quick reply!
Just to help you out, the coding for superscripts is <sup>2</sup>
OR if you want to make the "squared" sign hold the "ALT" key and simultaneously type 0178 on the number key pad and you'll get ²
to get the "cubed" sign it's the "ALT" key plus 0179 and you get ³
This is not a physics question.
Each time a ball bounces it will bounce to, let's say 75% of its previous height.
(I am not interested in the time, energy or velocity, of the ball.)
So if we drop it from 100 cm it will bounce back up to 75 cm, and on the next bounce it goes up to 56.25 cm and...
Okay, my topic doesn't really ask a question but it is surprising to me that the old criteria of 273.15K and 760 torr are still being reported as the standard and very few websites have the "new" criteria of 750.06 torr.
Are scientists, webmasters, etc. usually this slow at adopting changes...
When reading about radioactive decay, I see two types of decay constants: λ and "k".
From what I have interpreted, k = ln (.5) / half-life
whereas λ = ln (2) / half-life.
Have I defined these correctly?
If this is so, the difference between the two is slight.
When putting these into equations...
I originally was writing a pendulum calculator and while researching the Internet, I came across this topic. Anyway, I finished the calculator and it is online: http://www.1728.org/pendulum.htm
It can calculate pendulum periods up to theta 14 and uses the arithmetic mean to calculate exact...