Unformatted text preview: AP® Calculus AB
2006 FreeResponse Questions
Form B The College Board: Connecting Students to College Success
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AP Central is the official online home for the AP Program: apcentral.collegeboard.com. 2006 AP® CALCULUS AB FREERESPONSE QUESTIONS (Form B)
CALCULUS AB
SECTION II, Part A
Time— 45 minutes
Number of problems— 3
A graphing calculator is required for some problems or parts of problems. x3
x2
x
 + 3cos x. Let R be the shaded region in the second
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3
2
quadrant bounded by the graph of f, and let S be the shaded region bounded by the graph of f and line , the 1. Let f be the function given by f ( x ) = line tangent to the graph of f at x = 0, 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 = 2.
(c) Write, but do not evaluate, an integral expression that can be used to find the area of S. WRITE ALL WORK IN THE EXAM BOOKLET. © 2006 The College Board. All rights reserved.
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2 2006 AP® CALCULUS AB FREERESPONSE QUESTIONS (Form B) 2. Let f be the function defined for x ≥ 0 with f (0 ) = 5 and f ¢, the first derivative of f, given () by f ¢( x ) = e(  x 4) sin x 2 . The graph of y = f ¢( x ) is shown above.
(a) Use the graph of f ¢ to determine whether the graph of f is concave up, concave down, or neither on the
interval 1.7 < x < 1.9. Explain your reasoning.
(b) On the interval 0 £ x £ 3, find the value of x at which f has an absolute maximum. Justify your answer.
(c) Write an equation for the line tangent to the graph of f at x = 2. WRITE ALL WORK IN THE EXAM BOOKLET. © 2006 The College Board. All rights reserved.
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3 2006 AP® CALCULUS AB FREERESPONSE QUESTIONS (Form B) 3. The figure above is the graph of a function of x, which models the height of a skateboard ramp. The function
meets the following requirements.
(i) At x = 0, the value of the function is 0, and the slope of the graph of the function is 0.
(ii) At x = 4, the value of the function is 1, and the slope of the graph of the function is 1.
(iii) Between x = 0 and x = 4, the function is increasing.
(a) Let f ( x ) = ax 2 , where a is a nonzero constant. Show that it is not possible to find a value for a so that f
meets requirement (ii) above. x2
, where c is a nonzero constant. Find the value of c so that g meets requirement (ii)
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above. Show the work that leads to your answer. (b) Let g ( x ) = cx3  (c) Using the function g and your value of c from part (b), show that g does not meet requirement (iii) above. xn
, where k is a nonzero constant and n is a positive integer. Find the values of k and n so
k
that h meets requirement (ii) above. Show that h also meets requirements (i) and (iii) above. (d) Let h( x ) = WRITE ALL WORK IN THE EXAM BOOKLET. END OF PART A OF SECTION II © 2006 The College Board. All rights reserved.
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CALCULUS AB
SECTION II, Part B
Time— 45 minutes
Number of problems— 3
No calculator is allowed for these problems. 4. The rate, in calories per minute, at which a person using an exercise machine burns calories is modeled by the
1
3
function f. In the figure above, f (t ) =  t 3 + t 2 + 1 for 0 £ t £ 4 and f is piecewise linear for 4 £ t £ 24.
4
2
(a) Find f ¢(22 ) . Indicate units of measure.
(b) For the time interval 0 £ t £ 24, at what time t is f increasing at its greatest rate? Show the reasoning that
supports your answer.
(c) Find the total number of calories burned over the time interval 6 £ t £ 18 minutes.
(d) The setting on the machine is now changed so that the person burns f (t ) + c calories per minute. For this
setting, find c so that an average of 15 calories per minute is burned during the time interval 6 £ t £ 18. WRITE ALL WORK IN THE EXAM BOOKLET. © 2006 The College Board. All rights reserved.
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5 2006 AP® CALCULUS AB FREERESPONSE QUESTIONS (Form B) 5. Consider the differential equation dy
2
= ( y  1) cos ( p x ) .
dx (a) On the axes provided, sketch a slope field for the given differential equation at the nine points indicated.
(Note: Use the axes provided in the exam booklet.) (b) There is a horizontal line with equation y = c that satisfies this differential equation. Find the value of c.
(c) Find the particular solution y = f ( x ) to the differential equation with the initial condition f (1) = 0. © 2006 The College Board. All rights reserved.
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6 2006 AP® CALCULUS AB FREERESPONSE QUESTIONS (Form B) t
(sec)
v(t )
(ft sec ) (ft a(t )
sec 2 ) 0 15 25 30 35 50 60 –20 –30 –20 –14 –10 0 10 1 5 2 1 2 4 2 6. A car travels on a straight track. During the time interval 0 £ t £ 60 seconds, the car’s velocity v, measured in
feet per second, and acceleration a, measured in feet per second per second, are continuous functions. The table
above shows selected values of these functions.
(a) Using appropriate units, explain the meaning of
60 Ú30 60 Ú30 v(t ) dt in terms of the car’s motion. Approximate v(t ) dt using a trapezoidal approximation with the three subintervals determined by the table. (b) Using appropriate units, explain the meaning of
value of 30 Ú0 30 Ú0 a(t ) dt in terms of the car’s motion. Find the exact a(t ) dt. (c) For 0 < t < 60, must there be a time t when v(t ) = 5 ? Justify your answer.
(d) For 0 < t < 60, must there be a time t when a(t ) = 0 ? Justify your answer. WRITE ALL WORK IN THE EXAM BOOKLET.
END OF EXAM © 2006 The College Board. All rights reserved.
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