In determining viscosity `(eta)` by the equaction `eta = (pi pr^(4))/(8vl)` which of the quantities must be measured more accuraltely

In determing viscosity (eta) by poiseuille's method for formula used eta = (pi p r^4)/(8 vl) . Which of the quantities in the formula must be measured more accurately

In determing viscosity (eta) by poiseuille's method for formula used eta = (pi p r^4)/(8 vl) . Which of the quantities in the formula must be measured more accurately

In an experiment to determine the coefficient of viscosity of a liquid using the formual eta=(piPr^(4))/(8l Q) the radius of the capillary tube was measured to be 0.41 mm using an instrument of least count 0.001 cm, length l was measured usinga metre scale as 15 cm. The percentae error in the pressure difference is 0.4% and the percentage error in the volume of the liquid flow out per second Q is 0.3% what is the maximum percentage error in the coefficient of viscosity?

If the fundamental quantites are velocity (upsilon) , mass (M), time (T), what will be the dimensions of eta in the equaiton V = (pi pr^4)/(8I eta) where the symbosl have their usual meaning?

Turpentine oil is flowing through a tube of length L and radius r . The pressure difference between the two ends of the tube is p , the viscosity of the coil is given by eta = (p (r^(2) - x^(2)))/(4 vL) , where v is the velocity of oil at a distance x from the axis of the tube. From this relation, the dimensions of viscosity eta are

Turpentine oil is flowing through a tube of length L and radius r . The pressure difference between the two ends of the tube is p , the viscosity of the coil is given by eta = (p (r^(2) - x^(2)))/(4 vL) , where v is the velocity of oil at a distance x from the axis of the tube. From this relation, the dimensions of viscosity eta are