4.6 - Blackboard Learning System 3/29/09 9:48 PM Your...

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Unformatted text preview: Blackboard Learning System 3/29/09 9:48 PM Your location: Assessments › View All Submissions › View Attempt View Attempt 1 of 5 Title: Started: Submitted: Time spent: Problem Set 4.6 March 22, 2009 2:41 AM March 22, 2009 4:30 AM 01:48:41 Total score adjusted by 0.0 Maximum possible score: 10 Total score: 6/10 = 60% Done 1. Provide an appropriate response. Assume x = x(t) and y = y(t). Find and = 2 when and Student Response A. B. C. D. Score: 2. Provide an appropriate response. Evaluate dy/dt for the function at the point. = x2 + y2; dx/dt = 12, x = 1, y = 0 0/1 Feedback - http://online.sdccd.edu/webct/urw/lc4130001.tp0/cobaltMainFrame.dowebct Page 1 of 5 Blackboard Learning System 3/29/09 9:48 PM Student Response A. B. - 12 C. 12 D. Score: 3. Provide an appropriate response. 1/1 Feedback Suppose two automobiles leave from the same point at the same time. If one travels north at 60 miles per hour and the other travels east at 45 miles per hour, how fast will the distance between them be changing after three hours? Student Response A. 50 mph B. 150 mph C. 75 mph D. 125 mph Score: 4. Provide an appropriate response. A ladder is placed against a wall. If the top of the ladder is sliding down the wall at 3 feet per second, at what rate is the bottom of the ladder moving away from the wall when the bottom of the ladder is 9 feet away from the wall ? 1/1 Feedback Student Response A. 8.1 ft/sec B. -8.1 ft/sec C. 4.9 ft/sec D. 5.4 ft/sec Score: 5. 1/1 Feedback Evaluate dy/dt for the function at the point. http://online.sdccd.edu/webct/urw/lc4130001.tp0/cobaltMainFrame.dowebct Page 2 of 5 Blackboard Learning System 3/29/09 9:48 PM x2ey - y2 ln x = 8; dx/dt = 1, x = 1, y = 2 Student Response A. Feedback B. C. D. 8 Score: 6. Solve the problem. A zoom lens in a camera makes a rectangular image on the film that is 9 cm × 8 cm. As the lens zooms in and out, the size of the image changes. Find the rate at which the area of the image begins to change (dA/df) if the length of the frame changes at 0.7cm/s and the width of the frame changes at 0.4 cm/s. 1/1 Student Response A. 1.15 m2/s B. m2/2 Feedback C. 9.5 m2/s D. 9.2 m2/s Score: 7. Evaluate dy/dt for the function at the point. xy 2 = 4; dx/dt = -5, x = 4, y = 1 0/1 http://online.sdccd.edu/webct/urw/lc4130001.tp0/cobaltMainFrame.dowebct Page 3 of 5 Blackboard Learning System 3/29/09 9:48 PM Student Response A. B. C. D. Score: 8. Feedback - 1/1 Evaluate dy/dt for the function at the point. x3 + y3 = 9; dx/dt = -3, x = 1, y = 2 Student Response A. B. C. D. Score: 9. 1/1 - Feedback Evaluate dy/dt for the function at the point. = x2 + y2; dx/dt = 12, x = 1, y = 0 Student Response A. - Feedback http://online.sdccd.edu/webct/urw/lc4130001.tp0/cobaltMainFrame.dowebct Page 4 of 5 Blackboard Learning System 3/29/09 9:48 PM B. 12 C. -12 D. Score: 10. Evaluate dy/dt for the function at the point. xy + x = 12; dx/dt = -3, x = 2, y = 5 Student Response A. 3 B. - 9 C. 9 D. -3 Score: 0/1 Feedback 0/1 Done http://online.sdccd.edu/webct/urw/lc4130001.tp0/cobaltMainFrame.dowebct Page 5 of 5 ...
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This note was uploaded on 04/21/2009 for the course MATH 121 taught by Professor Hamidy during the Spring '09 term at Miramar College.

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