A steel ball [e0.46 kJ/kg. °C, k 35 W/m-°C] 5.0 cm in diameter and initially at a uniform temperature of 450°C is suddenly placed in a controlled environment in which the temperature is maintained at 100°C. The convection heat-transfer coefficient is 10 W/m °C. Calculate the time required for the ball to attain a temperature of 150°C.

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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.