* The structure is designed to support P=99 kN load. The structure consists of a boom and rod joined by pins (zero moment connections) at the junctions and supports. * Perform a static analysis to determine the internal force in each structural member and the reaction forces at the supports d-25 mm mm Flat end TOP VIEW OF ROD Bc d- 20 mm 20 mm Omm d-25 mm 600 mm FRONT VIEW 600 mm Flat end 50 mm S00 mm- PkN PkN 50 mm END VIEW 25 mm I20 mm 30 mm 125 mm I20 mm S00 mm TOP VIEW OF BOOM AB PkN -25 mm

The properties of materials can be classified into the following categories: Mechanical Physical Thermal Electrical Magnetic Describe each category, include two specific properties in the description and say why those properties are of interest to a design engineer.

Which choice below best describes the mechanical property of materials called toughness?    a. Ability to compress without permanent deformation   b. Ability to bend in the elastic range   c. How much energy a material can absorb without breaking   d. Indentation resistance

Which of the following conditions/factors will reduce a materials fatigue resistance: Select one or more: a. Roughening or etching the surface b. Experiencing a permanent residual compressive stress c. Increasing the stress amplitude d. Experiencing a mean tensile stress e. Mechanically hardening the surface