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Sensei

Member Since 04 Oct 2013
Offline Last Active Today, 05:28 AM
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Posts I've Made

In Topic: N-Body Problem - need a simple answer for a created planetary system

22 March 2017 - 03:43 AM

Google for "star system simulator online"
https://www.google.c...imulator online
There are available simulators in web browser window where you can enter mass of object, start radius, and start velocity of object.

After starting simulator you will observe how they behave over time.

You could try this for instance:
http://www.stefanom.org/spc/

In Topic: Better Education

21 March 2017 - 08:17 PM

What would be the best way to give people a better education?


Lessons shouldn't be boring. Boring lessons discourage kids from learning.

Teacher should love teaching. Not treat school as gulag.
Just because he/she didn't find any better paid job.
 

Like extending school through the summer,


No. There is time for work, and there is time for vacation.
 

(focusing on the United States.)?


Almost every time I see some US movie about kids in school, it's focused on football, baseball or basketball..
Quote from any such movie "Trainer, I beg, you can't fire me from the team! I will lose scholarship and won't be able go to collage"..
(I was not in school for dozen years, but never heard about somebody here receiving scholarship for just being in team of players of any sport)
Isn't "promotion" of sportsmen and cheerleaders as 1st league of scholar society.. ?
At the same time nerds, geeks, etc. actually the smartest students in school, are showed as freaks and losers..

In Topic: Moon Rotation

21 March 2017 - 07:30 PM

Why are we squaring the m/s?

And the purpose of g is to check how much force acts on an object like in the formula for height energy? (Eh = m * g *h)

 

Do you know how Newton's motion equations are derived?

 

If you have object at time t0 (we can simplify it's t=0) at location x0 (also we can simplify it's x0=0),

then it moves at time t1 to location x1,

then it moves at time t2 to location x2.

 

We can create equation describing this movement, to predict:

1) whether it's constant velocity (lack of acceleration, linear equation),

2) whether it's accelerating, or whether it's decelerating.

 

1) Movement with constant velocity equation will look like:

f(t)=x0+v*t

where v is in meters per second m/s:

v= (x1-x0)/(t1-t0) = (x2-x1)/(t2-t1) = dx/dt

 

2) Movement with acceleration/deceleration equation will look:

f(t)=x0 + (a*t^2)/2

 

a = (v1-v0)/(t1-t0) = ( (x2-x1)/dt - (x1-x0)/dt ) / dt = dv/dt

Acceleration/deceleration is change of velocity in unit of time. Velocity has already unit m/s. After further division by time in seconds, you get m/s^2.

If velocity remain constant. There is no acceleration or deceleration.


In Topic: New political party

21 March 2017 - 01:16 AM

Better to end the summer break in schools


Poor students use summer break to earn money for the rest of year..
(which disallows them to fully recover after year at school)

In Topic: New political party

21 March 2017 - 01:09 AM

What about simply increasing high school by two years,


Quality of study is more important than length of study. But if somebody is overloaded with work, increased time, might help him/her finish it.
If somebody remembers answers for exam, and the next day, week, or month, forget everything, it's pointless education.
Student has to remember knowledge. Only in the worst case, remember how to regain it, searching net, or books.