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IB MAI HL Calculus Topic 5.2 Integration (id: b42debe01)

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admin 发表于 2024-3-21 16:06:53 | 显示全部楼层 |阅读模式
本题目来源于试卷: IB MAI HL Calculus Topic 5.2 Integration,类别为 IB数学

[填空题]
During a trip to a forest to foxb)m.urftc,2u iiu2 6rage for smet3. zdz 5ea4vev(, mushrooms, Viviane finds a giant mushroom. She decides to model the shape of the mushroom to find itsvae vezmes.5 d(, z34t volume.

After taking a photo of the mushroom and zooming in to get its real size, she rotates the photograph and estimates that the cross-section passes through the points (0,3) (15,3),(15,15),(22,10),(23.5,6) and (24,0) , where all measurements are in centimetres. The cross-section is symmetrical about the x -axis, as shown below.

Viviane models the section from (0,3) and (15,3) with a straight line.
1. Write down the equation of the line that passes through these points.
y=  .
Next, Viviane models the section that passes through the points (15,15),(22,10) , (23.5,6) and (24,0) with a quadratic curve. it is (  ,  )
2. 1. Use your G.D.C. to find the equation of this quadratic curve.
y≈-1.82(x-a)$^2$+a;a=  .
2. By considering the gradient of the curve at the point (15,15) , explain why this may not be a good model.

Viviane thinks she can obtain a better model if a quadratic passing through the point (24,0) with a maximum point at (15,15) is used.
3. Find the equation of this model, in the form y=a(x-h)^{2}+k .

Using this new model, Viviane proceeds to estimate the volume of the mushroom by finding the volume of revolution about the x -axis.
4. 1. Write down an expression for her estimate as a sum of two integrals.
2. Find the volume of the mushroom estimated by Viviane.
V≈   cm$^2$ (round number)




参考答案:
空格1: 3空格2: 15空格3: 15空格4: 15空格5: 3820


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