Even i thought that it should be done like this, but i am not to figure out while decreasing by 3kmittal82 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]
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.goyalsau wrote:Even i thought that it should be done like this, but i am not to figure out while decreasing by 3kmittal82 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]
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.
what is decreased by a factor of 3?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
I presume its 'r', only then the question would make sense.diebeatsthegmat wrote:what is decreased by a factor of 3?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
