HW_8_Key

# HW_8_Key - Miller Kierste – Homework 8 – Due 3:00 am...

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Unformatted text preview: Miller, Kierste – Homework 8 – Due: Oct 19 2007, 3:00 am – Inst: JEGilbert 1 This print-out should have 14 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Find the domain of the vector function r ( t ) = h t 2 , √ t- 4 , ln(9- t ) i . 1. t < 4 , t > 9 2. 4 ≤ t < 9 correct 3. 4 < t < 9 4. 4 ≤ t ≤ 9 5. 4 < t ≤ 9 Explanation: A vector function r ( t ) = h f ( t ) , g ( t ) , h ( t ) i is defined when each of f ( t ) , g ( t ) and h ( t ) is defined. Now, for the given function, f ( t ) = t 2 is defined for all t while g ( t ) = √ t- 4 is defined only when t ≥ 4. On the other hand, h ( t ) = ln(9- t ) is defined only 9- t > 0. Consequently, the domain of r ( t ) consists of all t , 4 ≤ t < 9 . keywords: vector function, domain, power function, square root function, log function, 002 (part 1 of 1) 10 points Find lim t → + r ( t ) when r ( t ) = h 8cos t, 10 e t , 6 t ln t i . 1. limit = h 8 , , 6 i 2. limit = h , 10 , i 3. limit = h 8 , ,- 6 i 4. limit = h 8 , 10 , 6 i 5. limit = h 8 , 10 , i correct Explanation: For a vector function r ( t ) = h f ( t ) , g ( t ) , h ( t ) i , the limit lim t → + r ( t ) = h lim t → + f ( t ) , lim t → + g ( t ) , lim t → + h ( t ) i . But for the given vector function, lim t → + f ( t ) = lim t → + 8cos t = 8 , while lim t → + g ( t ) = lim t → + 10 e t = 10 , and lim t → + h ( t ) = lim t → + t ln t = 0 , using L’Hospital’s Rule. Consequently, lim t → + r ( t ) = h 8 , 10 , i . keywords: vector function, limit, trig function log function, exponential function 003 (part 1 of 1) 10 points Miller, Kierste – Homework 8 – Due: Oct 19 2007, 3:00 am – Inst: JEGilbert 2 A space curve is shown in black on the surface x y z Which one of the following vector functions has this space curve as its graph?...
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HW_8_Key - Miller Kierste – Homework 8 – Due 3:00 am...

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