Concept explainers
a.
To verify that the volume of the box is given by the function
a.
Answer to Problem 109E
The volume of the box is
Explanation of Solution
Given:
An open box is to be made from a square piece of material 36 centimeters on a side by cutting equal squares with sides of length x from the corners and turning up the sides.
Concept Used:
Volume of the box=
Calculation:
Length of the box =36- 2x .
Width of the box =36- 2x .
Height of the box = x .
Conclusion:
The volume of the box is
b.
To find the domain of the function V.
b.
Answer to Problem 109E
The domain of the function V is 0<x <18 cm.
Explanation of Solution
Given:
An open box is to be made from a square piece of material 36 centimeters on a side by cutting equal squares with sides of length x from the corners and turning up the sides.
Calculation:
Need to cut something, so x >0.
But cannot more than half the side length of the material. So also
Conclusion:
The domain of the function V is 0<x <18 cm.
c.
To use the table feature of a graphing utility to create a table that shows various box height x and the corresponding volumes V. Use the table to estimate a range of dimensions within which the maximum volume is produced.
c.
Answer to Problem 109E
The maximum volume seems to occur between 5 and 7 cm.
Explanation of Solution
Given:
An open box is to be made from a square piece of material 36 centimeters on a side by cutting equal squares with sides of length x from the corners and turning up the sides.
Calculation:
Using graphing utility below table that shows various box height x and the corresponding volumes V as y.
Height x | Volume V |
0 | 0.00 |
1 | 1156.00 |
2 | 2048.00 |
3 | 2700 |
4 | 3136.00 |
5 | 3380.00 |
6 | 3456.00 |
7 | 3388.00 |
8 | 3200.00 |
9 | 2916.00 |
10 | 2560.00 |
11 | 2156.00 |
12 | 1728 |
13 | 1300 |
14 | 896.00 |
15 | 540.00 |
16 | 256.00 |
17 | 68.00 |
18 | 0.00 |
Conclusion:
The maximum volume seems to occur between 5 and 7 cm.
d.
To use the graphing utility to graph V and use the range of dimension from part (c ) to find the x −value for which V(x) is maximum.
d.
Answer to Problem 109E
The maximum occurs at exactly x =6 cm , with volume at 3456
Explanation of Solution
Given:
An open box is to be made from a square piece of material 36 centimeters on a side by cutting equal squares with sides of length x from the corners and turning up the sides.
Calculation:
Using graphing utility below table that shows various box height x and the corresponding volumes V as y.
Height x cm | Volume V |
0 | 0.00 |
1 | 1156.00 |
2 | 2048.00 |
3 | 2700 |
4 | 3136.00 |
5 | 3380.00 |
6 | 3456.00 |
7 | 3388.00 |
8 | 3200.00 |
9 | 2916.00 |
10 | 2560.00 |
11 | 2156.00 |
12 | 1728 |
13 | 1300 |
14 | 896.00 |
15 | 540.00 |
16 | 256.00 |
17 | 68.00 |
18 | 0.00 |
The Graph on above table is shown below.
Conclusion:
The maximum occurs at exactly x =6 cm , with volume at 3456
Chapter 2 Solutions
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