Question 9: During a fire, a firefighter holds a hose with a diameter of 4 cm and length of 50 m. The water moves through the hose with a speed of v= 10 m/s. Assume that the hose is horizontal (the water does not have to go up- or downhill) and that the flow of water is laminar. Take for the viscosity of water n = 1.0-10- Ns/m and for the pressure of 1 atmosphere 1.0.105 N/m. What is the pressure P2 at the end of the hose (where the water comes out)? Calculate the water flow Q through the hose C. Calculate the pressure P at the beginning of the hose (where the water goes in) A. B.