Castor oil, which has a density 0.96 x 103 kg/m³ at room temperature, is forced through a pipe of circular cross section by a pump that maintains a gauge pressure of 950 pa the pipe has a diameter of 2.6 cm and a length of 65cm the castor oil emerging from the free end of the pipe at atmospheric pressure is collected after 90 s, a total of 1.23 kg has been collected what is the coefficient of viscosity of the castor oil at this temperature?