a cross beam in a highway bridge experiences a stress of 14 ksi due to the dead weight of the bridge structure. when a fully loaded tractor-trailer crosses over the bridge, however, the stress in the beam increases to 45 ksi. the beam is fabricated from steel with an ultimate tensile strength of 76 ksi, a yield strength of 50 ksi, and an endurance limit of 38 ksi.

What are the two main ideas of this passage? museum experts feel that museums must change to attract visitors. museum experts care more about the number of visitors than about history. museums that display artworks and exhibits do not make families welcome. museums like colonial williamsburg make learning about the past fun. museums in the united states are different than in other countries.

Zachary has been trying to work on an essay for almost three hours, be he can't seem to focus for more than 15 or 20 minutes at a time. what should he do so that the quality of his work doesnt suffer because of poor concentration and lack of energy

Mason ran 2/3 mile in 1/3 hours. what was nasons unit rate?