Need engineering help with some fluid questions

final_exam_1.pdfProblems5_6.pdfi finished 2 and 4 , if you can help me with rest please contact me asap

the correct answer for 3 is wall stress =(3*mu*q)/(pi*r*h^2)

for 6 is pressure= (6*mu*q)/(pi*h^3)*ln(r2/r1)

final_exam_1.pdfproblems5_6.pdf