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by kmittal82 » Fri Oct 01, 2010 5:34 am
> if is decreased

which variable are we decreasing here?
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by kmittal82 » Fri Oct 01, 2010 5:36 am
k = 9/[-27*(r^3)]

= (-1/3)*(1/r^3)

Assuming you meant r decreases by a factor of 3.
Now, k becomes (-1/3)*(1/[r/3^3]) = (-1/3)*(1/r^3)*27

this means k got multiplied by 27

[spoiler](A)[/spoiler]
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by goyalsau » Fri Oct 01, 2010 8:22 am
kmittal82 wrote:k = 9/[-27*(r^3)]

= (-1/3)*(1/r^3)

Assuming you meant r decreases by a factor of 3.
Now, k becomes (-1/3)*(1/[r/3^3]) = (-1/3)*(1/r^3)*27

this means k got multiplied by 27

[spoiler](A)[/spoiler]
Even i thought that it should be done like this, but i am not to figure out while decreasing by 3
do we actually divide by 3. As per looking at the option that is all possible they are doing it.
But i am not able not fully convinced with this sort of decreasing.
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by kmittal82 » Fri Oct 01, 2010 3:43 pm
goyalsau wrote:
kmittal82 wrote:k = 9/[-27*(r^3)]

= (-1/3)*(1/r^3)

Assuming you meant r decreases by a factor of 3.
Now, k becomes (-1/3)*(1/[r/3^3]) = (-1/3)*(1/r^3)*27

this means k got multiplied by 27

[spoiler](A)[/spoiler]
Even i thought that it should be done like this, but i am not to figure out while decreasing by 3
do we actually divide by 3. As per looking at the option that is all possible they are doing it.
But i am not able not fully convinced with this sort of decreasing.
We divide by 3 since the question says it reduces by a factor of 3, not just by 3 alone. If something increases or decreases by a factor of x, then you multiply or divide by x.
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by diebeatsthegmat » Sat Oct 02, 2010 8:04 pm
pradeepkaushal9518 wrote:In the formula k=9/(-3r)^3, , if is decreased by a factor of 3 , then K is multiplied by

A 27

B -27/8

C 1

D -8/27

E 1/27
what is decreased by a factor of 3?
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by kmittal82 » Sun Oct 03, 2010 5:24 am
diebeatsthegmat wrote:
pradeepkaushal9518 wrote:In the formula k=9/(-3r)^3, , if is decreased by a factor of 3 , then K is multiplied by

A 27

B -27/8

C 1

D -8/27

E 1/27
what is decreased by a factor of 3?
I presume its 'r', only then the question would make sense.
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