A system consisting of two bodies and three Spring so may be set into free vibrations .
Find the nature frequencies of this system
and the amplitude ratio of the movements
of mass1 and mass2 for each frequeney, mass1= 600kg,
mass2 = 100kg, k1 = 120KN/m, K2 = 90 kN/m, K3 =60 kN/m.​

Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.

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.

What is creep? what is stress relaxation?