A 2 kw immersion heater consists of an electrical heating element contained in a 50 mm diameter sealed horizontal tube, and is used to heat water to 60c. If the surface temperature of the tube is not to exceed 95c, calculate the length of tube required. (the coefficient of cubical expansion of water may be taken as 0.21 x 10-3 k-1). [l = 0.635 m]
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