K.C.S.E Physics Q & A - MODEL 2010PP1QN07

K.C.S.E Physics Q & A - MODEL 2010PP1QN07

​Figure 4 shows a horizontal tube with two vertical tubes x and y. Water flows through the horizontal tube from right to left. The water level in tube x is higher than water level in tube y.

​Explain this observation.

answer

• The tube below Y is narrower than the tube below X. So water flows faster below Y. Pressure is therefore lower than Y (Bernoulli effect).