12.5 Exercise 8

Concrete is pumped from a cement mixer to the place it is being laid, instead of being carried in wheelbarrows. The flow rate is 200.0 L/min through a 50.0-m-long, 8.00-cm-diameter hose, and the pressure at the pump is $8 . \text{00} \times \text{10}^{6} \text{N}/\text{m}^{2}$. Verify that the flow of concrete is laminar taking concrete’s viscosity to be $48.0 \left(\text{N}/ \text{m}^{2}\right) \cdot \text{s}$, and given its density is $2300 kg/ \text{m}^{3}$.