Mechanical Engineering > GATE 2025 > Welding
During a welding operation, thermal power of 2500 W is incident normally on a metallic surface. As shown in the figure below (figure is NOT to scale), the heated area is circular. Out of the incident power, 85% of the power is absorbed within a circle of radius 5 mm while 65% is absorbed within an inner concentric circle of radius 3 mm. The power density in the shaded area is ______ W mm-2 (rounded off to 2 decimal places).
Correct : 19.90
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