u " ""' """\"' 4 I-orces OCR Physics A Exam-style E A sphere of radius, Ft, and mass, m, falling in a thick liquid experiences a drag force determined by Stoke's law. When the sphere has reached terminal velocity, v, Stoke's law suggests that m g = H? v. where k is a constant a ependent upon the liquid used. 6- Describe how you would measure the radius and the terminal 1velocity for a particular sphere. You should state the equipment required to complete the measurements. llllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll Q The measurements in part a were repeated for several spheres of identical mass but different radii. Explain how you would use the data obtained to verify that Stoke's law may be applied to this situation. cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc