Thinking Like an Engineer
Thinking Like an Engineer
4th Edition
ISBN: 9781269910989
Author: Elizabeth A. Stephan, David R. Bowman, William J. Park, Benjamin L. Sill, Matthew W. Ohland
Publisher: Pearson Learning Solutions
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Chapter 15, Problem 4ICA

An unmanned X-43A scramjet test vehicle has achieved a maximum speed of Mach number X.XX in a test flight over the Pacific Ocean, where X.XX is a positive value entered by the user. Mach number is defined as the speed of an object divided by the speed of sound. Assume the speed of sound is 343 meters per second. Determine the speed in units of miles per hour. For a test case, you may assume that the user provides the value of 9.68 for the Mach number.

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11.2 Boxes A and B are at rest on a conveyer belt that is initially at rest. The belt suddenly starts in an upward direction so that slipping instantly occurs between the belt and the boxes. The kinetic friction coefficients between the belt and the boxes are μk,A = 0.3 and μk,B = 0.32. Determine the initial acceleration of each box. Will the blocks stay together, or separate? 80 lb 100 lb A B 15° Hint: to see if the boxes stay together or separate, first assume they separate, and see if their resulting motion (acceleration) validates that assumption. If the their motion is not consistent with the assumption of separation, then they must stay together.

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