 AP ### 2014年AP微积分BC简答题真题+答案+PDF下载 2014年AP微积分BC简答题真题+答案+PDF下载SectionII，PartA1）Grassclippingsareplacedinabin,wheretheydecompose.For0≤t≤30,theamountofgrassclippingsremaininginthebinismodeledbyA(t)=6.6...

#### 2014年AP微积分BC简答题真题+答案+PDF下载

Section II，Part A

1） Grass clippings are placed in a bin, where they decompose. For 0 ≤ t ≤ 30 , the amount of grass clippings remaining in the bin is modeled by A(t)=6.687(0.931)t, where A(t) is measured in pounds and t is measured in days.

Find the average rate of change of A(t) over the interval 0 ≤ t ≤ 30. Indicate units of measure.

Find the value of A'(15) . Using correct units, interpret the meaning of the value in the context of the problem.

Find the time tfor which the amount of grass clippings in the bin is equal to the average amount of grass clippings in the bin over the interval 0 ≤ t ≤ 30.

For t > 30,L(t), the linear approximation to A at t = 30 , is a better model for the amount of grass clippings remaining in the bin. Use L(t) to predict the time at which there will be 0.5 pound of grass clippings remaining in the bin. Show the work that leads to your answer

2） The graphs of the polar curves r=3 and r=3-2sin（2θ） are shown in the figure above for 0≤θπ.

(a) Let R be the shaded region that is inside the graph of r=3 and inside the graph of r=3-2sin(2θ).Find the area of R.

(b) For the curve r=3-2sin(2θ), find the value of dx/dθ at θ=π/6.

(c) The distance between the two curves changes for 0＜θ＜π/2. Find the rate at which the distance between the two curves is changing with respect to θ when θ=π/3.

(d) A particle is moving along the curve r=3-2sin(2θ) so that dθ/dt=3 for all times t≥0. Find the value of dr/dt at θ=π/6.

SECTION II, Part B部分

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PDF真题下载 科目 智思5分率 师资 课程目标 课程大纲 教材 AP微积分BC Calculus BC 91.1% 许和鑫， 黄欣 完成AP微积分BC阶段的知识点的学习。通过系统地梳理，充分的练习熟悉考试的题型和难点重点，冲5分。 课次1-2 Derivatives I &Application of Derivatives I Barron 和 Princeton版教材 课次3-4 Application of Derivatives II& The Definite Integral 课次5-6 Differential Equation & Application of Definite Integrals 课次7-8 L' Hôpital's Rule, Improper Integrals& Parametric vector, Polar functions 课次9-10 Infinite series I& Infinite series II 模考 最新真题

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