< Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown > Pics are attached, my concerns are with question 4 and 5. For q4 -which way is flow? How do we know? -the working then goes on to say that energy loss is compensated by increasing in pressure energy, however the question says that pressure is constant....clear contradiction -last bit he equated the shear force to fluid weight, but then for fluid weight he says that weight =density x g x area isn't weight density x g x volume?? For q5 -he stays that hf= (pressure1-pressure2)/densityxg but that would assume that velocity is constant ??question says nothing about constant velocity ! Thank you for any help!!!