An electric motor drives a stirrer fitted with a horizontal cylinder. The cylinder of 40 cm diameter contains a fluid restrained by a frictionless piston. During the stirring of fluid for 15 min the piston moves outward slowly by a distance of 30 cm against the atmospheric pressure of 1 bar. The current supplied to the mo- tor is 0.5 amp. from a 24-V lead-acid accumulator. If the conversion efficiency firom electrical work to mechanical work output is 90%, estimate the work done on the motor, stirrer and the atmosphere.

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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.