5-The crate has a mass of 80 kg and is being towed by a chain which is always directed at 20° from the horizontal as shown. Determine the crate's acceleration in t=2 s if the coefficient of static o0opo 20° friction is u. = 0.4, the coefficient of kinetic friction is uk = 0.3, and the towing force is P = (90t) N, where t is in seconds. (a=

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Buckling of columns

The column is described as a vertical member of the structure that carries an axial compressive load, and buckling is a lateral deformation of the column under the application of load.