ruhulchoudhury040 ruhulchoudhury040
  • 17-03-2019
  • Mathematics
contestada

M is directly proportional to r2.when r=2,m=14.Work out the value of r when m =224

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PeachyLove
PeachyLove PeachyLove
  • 17-03-2019

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➷ M = k x r^2

Substitute in the values:

14 = k x 2^2

Divide both sides by 2^2 to find k:

k = 3.5

Substitute the new values in:

224 = 3.5 x r^2

Divide both sides by 3.5 to find r^2

r^2 = 64

Square root it:

r = 8

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