H.W. #4: A pin connected truss is loaded and supported as shown, determine: a) The normal stress in member DE if it has a crosectional area of 750 mm². b) The minimum cross sectional area for member BC if the normal stress is limited to 30 MPa. 3 m 10 kN -3 m 15 kN -3 m 3m

Problem 2. [Concepts: Internal forces in 2D and average normal stress] The bars of the truss each have a cross-sectional area of 1.25 in². a) Determine the average normal stress in each member due to the loading P = 8 kip. State whether the stress is tensile or compressive. b) If the maximum average normal stress in any bar is not to exceed 20 ksi, determine the maximum magnitude P of the loads that can be applied to the truss. 4 ft 4 ft 4 E 0.75 P 0

- Determine the force in member GH and state if the member is in tension or compression. Express your answer to three significant figures and include the appropriate units. Enter negative value in the case of compression and positive value in the case of tension. FGH = Submit Part B. FBC= μA Value Part C Request Answer Determine the force in member BC and state if the member is in tension or compression. Express your answer to three significant figures and include the appropriate units. Enter negative value in the case of compression and positive value in the case of tension. HA Value Submit Request Answer 3 μA Units FBG = Value → Units ? Determine the force in member BG and state if the member is in tension or compression. Express your answer to three significant figures and include the appropriate units. Enter negative value in the case of compression and positive value in the case of tension. Units ? ?