1. There are several types of simple devices used to determine the viscosity of fluids. One type is a 'Bostwick' viscometer. It is used to determine the viscosity of a fluid by measuring the distance which a material flows under its own weight. It can also be used to determine the yield stress of a Bingham plastic. The inclined plane can be raised until the fluid on it flows. This is the angle at which the yield stress is reached. By assuming that the plane is very wide and that the flow (once it starts) is fully developed, the expression for shear stress can be determined as a function of the angle and fluid thickness (see diagram). Two different food manufacturers have developed catsup and one of them claims that their product has a 20% greater yield stress than their competitor. The manufacturer's catsup flows at an angle of 5. The competitor's catsup flows at an angle of 20. The thickness, , of the catsup is 0.5cm and its density is 2g/cm3. Is the manufacturers claim legitimate