How much mechanical energy loss due to friction is incurred as water flows steadily at 25 °C in a horizontal steel pipe at a velocity of 5 m s¹ when sudden expansion in the pipe cross- sectional area occurs with the inside diameter changing from 2.5 cm to 4.0 cm? (a) 5.12 J/kg (b) 1.024 J/kg (c) 1.957 J/kg (d) 3.835 J/kg

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