Maths- Gym for Brainiacs

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Post by Babun Sun Jan 29, 2012 8:59 am

If you're young and potent you wouldn't bother training your brains with content made for pensioners like Dr. Kawashimas nintendo game and other extremly softcore stuff eco smile Here, you'll be able to train your brain like you do with muscles, in power mode. Interesting fact, people who keep their brain fit rarely get alzheimer or other brain detoriation deceases. In other words, brain training is worth it eco smile Last but not least, it's always helpful to be smarter than the one next to you eco smile


Ali's question:

The position of a particle along a straight line at any time (t) s is given in meters by x(t) = 3t 3 − t 2 + 7t − 1. Find the acceleration of the particle when t = 2s.

1. deriviate x'(t)=9t²-2t+7
2. deriviate x''(t)=18t-2

2. deriviate is a function which describes the acceleration at any given point t eco smile For t=2s
x''(2)=18*2-2=34 (m/s²)

I'm under flu so take the answer with caution, maybe I'm right eco smile


Last edited by Immortal Babun on Thu Feb 23, 2012 12:29 pm; edited 8 times in total
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Post by Ali Sun Jan 29, 2012 11:59 am

You actually only do the derivative once, so it's

9t²-2t+7

9(4)-2(2)+7

36-4+7

39
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Post by Babun Sun Jan 29, 2012 12:26 pm

Ali"The Superman"8775 wrote:You actually only do the derivative once, so it's

9t²-2t+7

9(4)-2(2)+7

36-4+7

39
The flu got me I made a mistake 3*3 isn't 6 but 9 ( I corrected the answer in OP). You're wrong boy. If you do it once, you'll get the velocity eco smile You have to do it two times Very Happy

dx(t) /dt= v(t)
dv(t)/dt= a(t)

If you deriviate one time only, the unit m/s² is impossible to get mathematically eco smile

I'm no physicist though. I just imagine the velocity as a function which describes the change of position related to time and acceleration as a function which describes the changes in velocity related to time eco smile



Last edited by Kamina on Wed Feb 01, 2012 3:29 pm; edited 1 time in total
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Post by dansik Wed Feb 01, 2012 8:50 am

The answer is 7.

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Post by Ali Wed Feb 01, 2012 10:39 am

You are right Babun :bow:

Find the median of the data points given below.
4, 7, 4, 2, 8, 5, 8, 1, 0, 5, 9

This one is a statistics question.
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Post by Soul Wed Feb 01, 2012 11:27 am

seriously?
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Post by S Wed Feb 01, 2012 11:34 am

6th term so it must be 5

Been 6 years since i last studied Statistics banana

Babun's question was pretty easy though :coffee:

edit:i am not sure of my answer. Embarassed


Last edited by Surag on Wed Feb 01, 2012 11:42 am; edited 1 time in total
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Post by Ali Wed Feb 01, 2012 11:40 am

Soul wrote:seriously?

What? Razz
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Post by Lord Hades Wed Feb 01, 2012 1:27 pm

ahh mean median mode,, again
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Post by Babun Wed Feb 01, 2012 3:10 pm

Surag wrote:6th term so it must be 5

Been 6 years since i last studied Statistics banana

Babun's question was pretty easy though :coffee:

edit:i am not sure of my answer. Embarassed
I didn't pose the question, I answered for someone else eco smile
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Post by Babun Wed Feb 01, 2012 3:20 pm

Ali"The Superman"8775 wrote:You are right Babun :bow:

Find the median of the data points given below.
4, 7, 4, 2, 8, 5, 8, 1, 0, 5, 9

This one is a statistics question.


For an odd number of values

As an example, we will calculate the sample median for the following set of observations: 1, 5, 2, 8, 7.

Start by sorting the values: 1, 2, 5, 7, 8.

In this case, the median is 5 since it is the middle observation in the ordered list.

The median is the ((n + 1)/2)th item, where n is the number of values. For example, for the list {1, 2, 5, 7, 8}, we have n = 5, so the median is the ((5 + 1)/2)th item.

median = (6/2)th item
median = 3rd item
median = 5
I'm lazy to type, here the stuff from wikipedia which is right for once eco smile
The answer should be obvious if you follow the example eco smile Learn to think yourself my friend= maths eco smile
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Post by Ali Thu Feb 02, 2012 2:13 am

I'm not posting questions I don't know, I'm just posting some rough math questions Razz
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Post by S Thu Feb 02, 2012 2:43 am

Kamina wrote:
Surag wrote:6th term so it must be 5

Been 6 years since i last studied Statistics banana

Babun's question was pretty easy though :coffee:

edit:i am not sure of my answer. Embarassed
I didn't pose the question, I answered for someone else eco smile

What is the point of this thread then good sir :coffee:
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Post by Babun Thu Feb 02, 2012 4:26 am

Surag wrote:
Kamina wrote:
Surag wrote:6th term so it must be 5

Been 6 years since i last studied Statistics banana

Babun's question was pretty easy though :coffee:

edit:i am not sure of my answer. Embarassed
I didn't pose the question, I answered for someone else eco smile

What is the point of this thread then good sir :coffee:
Ali asked me a question in chatbox. I chose to answer in odds & ends eco smile
you could use the thread otherwise of course eco smile I used it like a notice board eco smile
Ali"The Superman"8775 wrote:I'm not posting questions I don't know, I'm just posting some rough math questions Razz
Surag answered your Q already Very Happy
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Post by Ali Thu Feb 02, 2012 5:23 am

It can be used for questions that you don't know how to answer or as a thread for you to test your knowledge :coffee:
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Post by S Thu Feb 02, 2012 5:29 am

That question you asked is kindergarten material.I could answer it despite not studying that subject for more than 6 years :coffee:

Come up with something better and which would test people's brain :coffee:

Spoiler:
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Post by Babun Thu Feb 02, 2012 7:16 am

Surag wrote:That question you asked is kindergarten material.I could answer it despite not studying that subject for more than 6 years :coffee:

Come up with something better and which would test people's brain :coffee:

Spoiler:
Here, a fun question of kindergraden level eco smile

A toad with very sticky extremities falls down a 10 meter well. Each day, it climbs two meters up, at night when it falls asleep it slids down by 1 meter. How long will the toad need to get out of the well?

Answer and justify why eco smile
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Post by S Thu Feb 02, 2012 7:28 am

I was joking man ..lol

I think i am going to be exposed here.Embarassed

It climbs 2 mts in the day and falls down 1 mt in the night which means in total it climbs 1 mt every day so that makes it 10 days to get out of the well. ?Just gave an answer logically.

I am probably 90 % wrong..You've put me in a spot babun Embarassed
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Post by dansik Thu Feb 02, 2012 9:16 am

It never gets out of the well. It dies alone and scared.

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Post by Babun Thu Feb 02, 2012 10:02 am

Surag wrote:I was joking man ..lol

I think i am going to be exposed here.Embarassed

It climbs 2 mts in the day and falls down 1 mt in the night which means in total it climbs 1 mt every day so that makes it 10 days to get out of the well. ?Just gave an answer logically.

I am probably 90 % wrong..You've put me in a spot babun Embarassed
Your answer isn't logicel hence 100% wrong eco smile Also, being scarred is the wrong approach eco smile
dansik wrote:It never gets out of the well. It dies alone and scared.
Cut toads some slack! eco smile I know they aren't the prettiest but the fugly world needs them eco smile

P.S. the question is really kindegarden level eco smile
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Post by RealGunner Thu Feb 02, 2012 10:14 am

9 days
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Post by Jack Daniels Thu Feb 02, 2012 10:24 am

1 + one = ?
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Post by Lord Hades Thu Feb 02, 2012 10:27 am

Kamina wrote:
Surag wrote:That question you asked is kindergarten material.I could answer it despite not studying that subject for more than 6 years :coffee:

Come up with something better and which would test people's brain :coffee:

Spoiler:
Here, a fun question of kindergraden level eco smile

A toad with very sticky extremities falls down a 10 meter well. Each day, it climbs two meters up, at night when it falls asleep it slids down by 1 meter. How long will the toad need to get out of the well?

Answer and justify why eco smile


it will climb out in the 9th day , wont slide back and take it to the 10th because its already out


this must be a very smart kindergarten because this is a very common question which is asked in the entrance exam i am going to take in May( Common Law Admission Test)
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Post by Babun Thu Feb 02, 2012 10:33 am

Lord Hades won because RG's answer was incomplete eco smile
@Lord Hades, common sense is always questioned eco smile
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Post by Babun Thu Feb 02, 2012 10:39 am

Next question:

Franchise , alexjanosik and friends from Farca section meet RM section in a goallegacy brawl eco smile
Franchise says to Jack Daniels: Come over to us and we'll overwelm them with doubled number of posters.
Jack Daniles answers to Franchise: Come over to our side, this way each side will have equal number of posters. The discussion will be active and balanced=> what the forum needs eco smile

The question, how many posters participate in the GL brawl from Farca and Real Madrid section? eco smile

P.S. junior high level eco smile

Again, answer and justify why eco smile


Last edited by Kamina on Thu Feb 02, 2012 1:43 pm; edited 1 time in total
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