The roof over a 7.0-m X 10.0-m room in a school has a total mass of 12,600

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The roof over a 7.0-m X 10.0-m room in a school has a total mass of 12,600 kg. The roof is to be supported by vertical “2 X 4s” (actually about 4.0cm X 9.0cm) along the 10.0-m sides, How many supports are required on each side, and how far apart must they be? Consider only compression, and assume a safety factor of 12.
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Materials Science and Engineering An Introduction

ISBN: 978-0470419977

8th edition

Authors: William D. Callister Jr., David G. Rethwisch

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