Question: 1 6 7 9 A 4 0 - cm - long, 8 0 0 - W electric resistance heating element with diameter 0 . 5

1679 A 40-cm-long, 800-W electric resistance heating element with diameter 0.5 cm
and surface temperature 120C is immersed in 75 kg of water initially at 20C. Determine
how long it will take for this heater to raise the water temperature to 80C. Also, determine
the convection heat transfer coefficients at the beginning and at the end of the heating
process.

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