4. How high must a pointed arch be if it is to span a space 8.0 m wide and, at its base, exert one-third the horizontal thrust force of a round (semicircular) arch? (Use the simple arch analysis from lecture.) 5. In 1981 an overhead walkway collapsed in the Regency Hyatt Hotel in Kansas City, see here: https:[en.wikipedia.orggwiki{Hyatt Regency walkway collapse. 114 people were killed. The cause of the collapse was traced to a naive substitution in the support scheme for the walkways. The engineers involved lost their licenses to practice. The design flaw is completely elementary and described in Giancoli Sec. 9-6, part ofthe posted material. Review the case and restate in your own words with good drawings