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Evaluate the temperature reached by the heater

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Q: An electrical heater 100 mm long and 5 mm in diameter is inserted into a hole drilled normal to the surface of a large block of material having a thermal conductivity of 5 W/m · K. Estimate the temperature reached by the heater when dissipating 50 W with the surface of the block at a temperature of 25°C.

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Mechanical Engineering: Evaluate the temperature reached by the heater

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