The change in diameter of a large steel bolt is carefully measured as the nut is tightened. Knowing that E=29*10^6 psi and v=o.3, determine the internal force in the bolt if the diameter is observed to decrease by 0.5*10^-3 in?

Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.