# AP Calculus BC 2006 Free-Response Questions

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2 CALCULUS BC SECTION II, Part A Time 45 minutes Number of problems A graphing calculator is required for some problems or parts of problems. 1. Let R be the shaded region bounded by the graph of y = ln x and the line y = x - 2, as shown above. (a) Find the area of R. (b) Find the volume of the solid generated when R is rotated about the horizontal line y =-. (c) Write, but do not evaluate, an integral expression that can be used to find the volume of the solid generated when R is rotated about the y-axis. 2 GO ON TO THE NEXT PAGE.

3 2 t 2. At an intersection in Thomasville, Oregon, cars turn left at the rate Lt () 60 tsin ( ) time interval 0 t 18 = cars per hour over the hours. The graph of y = L() t is shown above. (a) To the nearest whole number, find the total number of cars turning left at the intersection over the time interval 0 t 18 hours. (b) Traffic engineers will consider turn restrictions when Lt () 150 cars per hour. Find all values of t for which Lt () 150 and compute the average value of L over this time interval. Indicate units of measure. (c) Traffic engineers will install a signal if there is any two-hour time interval during which the product of the total number of cars turning left and the total number of oncoming cars traveling straight through the intersection is greater than 200,000. In every two-hour time interval, 500 oncoming cars travel straight through the intersection. Does this intersection require a traffic signal? Explain the reasoning that leads to your conclusion. GO ON TO THE NEXT PAGE.

4 . An object moving along a curve in the xy-plane is at position ( (), ()) for t 0. At time 2, dx - - sin 1 2 t dy = - and dt dt 1 ( e ) t = the object is at the point ( ) xt yt at time t, where 4t = 1 + t 6, -. (Note: sin -1 x = arcsin x) (a) Find the acceleration vector and the speed of the object at time t = 2. (b) The curve has a vertical tangent line at one point. At what time t is the object at this point? (c) Let mt () denote the slope of the line tangent to the curve at the point ( xt (), yt ()). Write an expression for mt () in terms of t and use it to evaluate lim mt (). tæ (d) The graph of the curve has a horizontal asymptote y = c. Write, but do not evaluate, an expression involving an improper integral that represents this value c. END OF PART A OF SECTION II 4

5 CALCULUS BC SECTION II, Part B Time 45 minutes Number of problems No calculator is allowed for these problems. t (seconds) vt () (feet per second) Rocket A has positive velocity vt () after being launched upward from an initial height of 0 feet at time t = 0 seconds. The velocity of the rocket is recorded for selected values of t over the interval 0 t 80 seconds, as shown in the table above. (a) Find the average acceleration of rocket A over the time interval 0 t 80 seconds. Indicate units of measure. 70 (b) Using correct units, explain the meaning of Ú vt () dtin terms of the rocket s flight. Use a midpoint Riemann sum with subintervals of equal length to approximate vt () dt. 10 (c) Rocket B is launched upward with an acceleration of at () = feet per second per second. At time t + 1 t = 0 seconds, the initial height of the rocket is 0 feet, and the initial velocity is 2 feet per second. Which of the two rockets is traveling faster at time t = 80 seconds? Explain your answer. Ú GO ON TO THE NEXT PAGE.

6 dy Consider the differential equation = 5x - for 2. dx y - 2 differential equation with the initial condition f (- 1) = - 4. y π Let y f( x) = be the particular solution to this (a) Evaluate dy dx 22 and d y at (-1, - 4 ). dx (b) Is it possible for the x-axis to be tangent to the graph of f at some point? Explain why or why not. (c) Find the second-degree Taylor polynomial for f about x =- 1. (d) Use Euler s method, starting at 1 that leads to your answer. x =- with two steps of equal size, to approximate ( ) f 0. Show the work 6. The function f is defined by the power series ( ) f x (- ) 2 n 1 x 2x x nx = n + 1 for all real numbers x for which the series converges. The function g is defined by the power series ( ) gx n (- ) ( n) 2 x x x 1 x = ! 4! 6! 2! for all real numbers x for which the series converges. (a) Find the interval of convergence of the power series for f. Justify your answer. (b) The graph of y = f( x) - g( x) passes through the point ( 0, - 1 ). Find y ( 0) and ( ) y 0. Determine whether y has a relative minimum, a relative maximum, or neither at x = 0. Give a reason for your answer. n n END OF EXAM 6

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