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A rocket on a test stand is modeled as a column clamped at x = 0 and free at x = L, and subjected to compressive force P applied at the free end. The direction of load P remains always parallel with the beam axis in the deformed configuration. For simplicity assume that the column is of uniform cross-section with constant EIy , The column is modeled with three elements of equal length.
(a) Determine the critical load Pcr at which the column becomes dynamically unstable.
(b) Plot Re(λ) vs. P'.
(c) Plot , ω1,ω2 vs. P'.
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The dielectric constant of air is practically taken as (A) more than unity. (B) Unity. (C) less than unity. (D) Zero.
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In this case, the armature is connected in series with the field coils. Thus I a = I f = I NB. At starting, the back emf is zero (because the m
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