To find the maximum volume find the derivative of (2) with respect to r and equate it to zero. 2(1074)ar – 67°r² %3D dr → 2(1074) ar – 6x²r = 0 → ra(2148 – 6ar) = 0 2148 358 →r = 0 or r = 67 Now to find height substitute value of r in h = 1074 – 2ar, 358 h = 1074 – 2n-: = 358. And h=y y = 358. 358 Using r = 98 in 2ar = x we get x-716. Therefore dimensions of a sheet of metal such that the cylinder is created with maximum volume are x=716 mm and y= 358 mm.

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Chapter1: Functions And Models
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Can someone explain to me the math on how  r=2148/6pi was found? 

 

Step 3
To find the maximum volume find the derivative of (2) with respect to r and equate it to zero.
dv
= 2(1074)xr
tr – 6x²r²
dr
dv
||
dr
= 2(1074) Tr – 6x²r² = 0
= rT (2148 – 6r) = 0
2148
358
» r = 0 or r =
бл
Now to find height substitute value of r in h = 1074 – 2ar,
358
h
1074 – 2n-
358.
||
And h=y = y = 358.
358
Using r =
in 2ar = x we get x=716.
Therefore dimensions of a sheet of metal such that the cylinder is created with maximum volume are
x=716 mm and y= 358 mm.
Transcribed Image Text:Step 3 To find the maximum volume find the derivative of (2) with respect to r and equate it to zero. dv = 2(1074)xr tr – 6x²r² dr dv || dr = 2(1074) Tr – 6x²r² = 0 = rT (2148 – 6r) = 0 2148 358 » r = 0 or r = бл Now to find height substitute value of r in h = 1074 – 2ar, 358 h 1074 – 2n- 358. || And h=y = y = 358. 358 Using r = in 2ar = x we get x=716. Therefore dimensions of a sheet of metal such that the cylinder is created with maximum volume are x=716 mm and y= 358 mm.
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