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20.25 (SI units) In a turning operation, cutting speed = 200 m/min, feed = 0.25 mm/rev, and depth of cut= 20 mm2/s, and volumetric specific heat = 3.54.00 mm. Thermal diffusivity of the work material(10-3) J/mm3-C. If the temperature increase above ambient temperature (20°C) is measured by a tool-chip thermo couple to
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