1.The strain in member AB was measured to be 8.9*10-4. If the member is an L3*2 1/2* 1/4 of A36 steel determine the following:
a) What is the change in length in inches?
b) What is the force in the member?
2.Laboratories containing dangerous materials are often kept at a pressure slightly less than ambient pressure so that contaminants can be discharged through an exhaust system rather than leaked through cracks and around doors to other parts of the building. If the pressure in a laboratory is 0.1 inch of water below that of a hallway, with what velocity will air enter the room under the laboratory door? Assume viscous effects are negligible.