+0  
 
+5
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The young boy discovered that m varied jointly as k and w2 , and inversely as the square root of x. The value of m was multiplied by what when x was multiplied by 8, w was multiplied by 3, and k was multiplied by 2?

 Apr 1, 2016
 #1
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0

You are describing:   m ~ kw^2 / sqrtx      

   now add the changes you described:    2 (3)^2 / sqrt 8      the value of m will change by this amount.

simplifies to   18/sqrt8    =   18/2sqrt2 = 9 /sqrt2     or  9 (sqrt2/2)   

 Apr 1, 2016
 #2
avatar+128408 
+5

m = [k w^2] / [√x ]

 

m = [ 2k (3w)^2 ] / √[8x] 

 

m = [2k*9w^2] /  (2 √[2x]  )

 

m = [ 18kw^2 ] / (2 √[2x] )

 

m = [9kw^2]/ √[2x]

 

m = [9/√2] [ kw^2] / √x

 

So.....m  is increased by a factor  of    9/√2

 

 

 

cool cool cool

 Apr 1, 2016

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