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# Assignment 3 http://session.masteringphysics.com/myct/assignmentPrintView. Physics with Lab Help Assignment 3 Close Resources Assignment 3 Due:59pm...

I need answers after Problem 3.
A CD-ROM drive in a computer spins the 12- -diameter disks at 9900 .

Assignment 3 Due: 11:59pm on Sunday, March 24, 2013 Note: You will receive no credit for late submissions. To learn more, read your instructor's Grading Policy Problem 1 Learning Goal: To practice Problem-Solving Strategy 6.1 Circular dynamics problems A 1500- car drives at 30 around a flat circular track 300 in diameter. What are the magnitude and direction of the net force on the car? PROBLEM-SOLVING STRATEGY Circular dynamics problems PREPARE Begin your visual overview with a pictorial representation in which you sketch the motion, define symbols, define axes, and identify what the problem is trying to find. There are two common situations: If the motion is in a horizontal plane, like a tabletop, draw the free-body diagram with the circle viewed edge-on, the -axis pointing toward the center of the circle, and the y-axis perpendicular to the plane of the circle. If the motion is in a vertical plane, like a Ferris wheel, draw the free-body diagram with the circle viewed face-on, the -axis pointing toward the center of the circle, and the -axis tangent to the circle. SOLVE Newton’s second law for uniform circular motion, , is a vector equation. Some forces act in the plane of the circle, some act perpendicular to the circle, and some may have components in both directions. In the coordinate system described above, with the -axis pointing toward the center of the circle, Newton’s second law is and . That is, the net force toward the center of the circle has magnitude , while the net force perpendicular to the circle is zero. The components of the forces are found directly from the free-body diagram. Depending on the problem, do one of the following: Use the net force to determine the speed , then use circular kinematics to find frequencies or angular velocities. Use circular kinematics to determine the speed , then solve for unknown forces. ASSESS Make sure your net force points toward the center of the circle. Check that your result has the correct units, is reasonable, and answers the question. Prepare Physics with Lab Assignment 3 Resources Help Close Assignment 3 http://session.masteringphysics.com/myct/assignmentPrintView. .. 1 of 13 2013-03-23 5:14 PM
Construct a free-body diagram and identify the variables that are given or need to be found. Part A Sort the following forces as acting on the car or not. ANSWER: Correct Part B Draw a free-body diagram for the car described in the introduction. The car is represented by the black dot in the center of the diagram. Use the coordinate system suggested in the problem-solving strategy. Specifically, let the positive x axis (toward the center of the circle) point to the right and the positive y axis (upward, perpendicular to the plane of the circle) point upward in your diagram. Draw the vectors starting at the black dot. The location and orientation of the vectors will be graded. The length of the vectors will not be graded. ANSWER: Assignment 3 http://session.masteringphysics.com/myct/assignmentPrintView. .. 2 of 13 2013-03-23 5:14 PM
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