Maths Gym for Brainiacs
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Maths Gym for Brainiacs
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 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 Last but not least, it's always helpful to be smarter than the one next to you
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)=9t²2t+7
2. deriviate x''(t)=18t2
2. deriviate is a function which describes the acceleration at any given point t For t=2s
x''(2)=18*22=34 (m/s²)
I'm under flu so take the answer with caution, maybe I'm right
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)=9t²2t+7
2. deriviate x''(t)=18t2
2. deriviate is a function which describes the acceleration at any given point t For t=2s
x''(2)=18*22=34 (m/s²)
I'm under flu so take the answer with caution, maybe I'm right
Last edited by Immortal Babun on Thu Feb 23, 2012 7:29 pm; edited 8 times in total
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Re: Maths Gym for Brainiacs
You actually only do the derivative once, so it's
9t²2t+7
9(4)2(2)+7
364+7
39
9t²2t+7
9(4)2(2)+7
364+7
39
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Re: Maths Gym for Brainiacs
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 You have to do it two timesAli"The Superman"8775 wrote:You actually only do the derivative once, so it's
9t²2t+7
9(4)2(2)+7
364+7
39
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
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
Last edited by Kamina on Wed Feb 01, 2012 10:29 pm; edited 1 time in total
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Re: Maths Gym for Brainiacs
The answer is 7.
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Re: Maths Gym for Brainiacs
You are right Babun
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.
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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Re: Maths Gym for Brainiacs
seriously?
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Re: Maths Gym for Brainiacs
6th term so it must be 5
Been 6 years since i last studied Statistics
Babun's question was pretty easy though
edit:i am not sure of my answer.
Been 6 years since i last studied Statistics
Babun's question was pretty easy though
edit:i am not sure of my answer.
Last edited by Surag on Wed Feb 01, 2012 6:42 pm; edited 1 time in total
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Re: Maths Gym for Brainiacs
Soul wrote:seriously?
What?
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Re: Maths Gym for Brainiacs
ahh mean median mode,, again
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Re: Maths Gym for Brainiacs
I didn't pose the question, I answered for someone elseSurag wrote:6th term so it must be 5
Been 6 years since i last studied Statistics
Babun's question was pretty easy though
edit:i am not sure of my answer.
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Re: Maths Gym for Brainiacs
Ali"The Superman"8775 wrote:You are right Babun
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.
I'm lazy to type, here the stuff from wikipedia which is right for onceFor 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
The answer should be obvious if you follow the example Learn to think yourself my friend= maths
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Re: Maths Gym for Brainiacs
I'm not posting questions I don't know, I'm just posting some rough math questions
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Re: Maths Gym for Brainiacs
Kamina wrote:I didn't pose the question, I answered for someone elseSurag wrote:6th term so it must be 5
Been 6 years since i last studied Statistics
Babun's question was pretty easy though
edit:i am not sure of my answer.
What is the point of this thread then good sir
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Re: Maths Gym for Brainiacs
Ali asked me a question in chatbox. I chose to answer in odds & endsSurag wrote:Kamina wrote:I didn't pose the question, I answered for someone elseSurag wrote:6th term so it must be 5
Been 6 years since i last studied Statistics
Babun's question was pretty easy though
edit:i am not sure of my answer.
What is the point of this thread then good sir
you could use the thread otherwise of course I used it like a notice board
Surag answered your Q alreadyAli"The Superman"8775 wrote:I'm not posting questions I don't know, I'm just posting some rough math questions
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Re: Maths Gym for Brainiacs
It can be used for questions that you don't know how to answer or as a thread for you to test your knowledge
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Re: Maths Gym for Brainiacs
That question you asked is kindergarten material.I could answer it despite not studying that subject for more than 6 years
Come up with something better and which would test people's brain
Come up with something better and which would test people's brain
 Spoiler:
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Re: Maths Gym for Brainiacs
Here, a fun question of kindergraden levelSurag wrote:That question you asked is kindergarten material.I could answer it despite not studying that subject for more than 6 years
Come up with something better and which would test people's brain
 Spoiler:
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
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Re: Maths Gym for Brainiacs
I was joking man ..lol
I think i am going to be exposed here.
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
I think i am going to be exposed here.
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
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Re: Maths Gym for Brainiacs
It never gets out of the well. It dies alone and scared.
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Re: Maths Gym for Brainiacs
Your answer isn't logicel hence 100% wrong Also, being scarred is the wrong approachSurag wrote:I was joking man ..lol
I think i am going to be exposed here.
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
Cut toads some slack! I know they aren't the prettiest but the fugly world needs themdansik wrote:It never gets out of the well. It dies alone and scared.
P.S. the question is really kindegarden level
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Re: Maths Gym for Brainiacs
9 days
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Re: Maths Gym for Brainiacs
1 + one = ?
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Re: Maths Gym for Brainiacs
Kamina wrote:Here, a fun question of kindergraden levelSurag wrote:That question you asked is kindergarten material.I could answer it despite not studying that subject for more than 6 years
Come up with something better and which would test people's brain
 Spoiler:
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
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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Re: Maths Gym for Brainiacs
Lord Hades won because RG's answer was incomplete
@Lord Hades, common sense is always questioned
@Lord Hades, common sense is always questioned
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Re: Maths Gym for Brainiacs
Next question:
Franchise , alexjanosik and friends from Farca section meet RM section in a goallegacy brawl
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
The question, how many posters participate in the GL brawl from Farca and Real Madrid section?
P.S. junior high level
Again, answer and justify why
Franchise , alexjanosik and friends from Farca section meet RM section in a goallegacy brawl
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
The question, how many posters participate in the GL brawl from Farca and Real Madrid section?
P.S. junior high level
Again, answer and justify why
Last edited by Kamina on Thu Feb 02, 2012 8:43 pm; edited 1 time in total
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