4. The two quantities x and y have an uncertainty x and y. Calculate the error in the following cases: a) x - 2y b) 4x - By C) 3xy 5. You measure two interval of time with a stop watch which has a precision equal to 0.01 s and find t1 = (35.23 i 0.01) s, and t2 = (15.71 i 0.01) 3. What is t1 -t2 (including the error)? 6. You measure a quantity x and nd x = (3.2 i 0.1) mls. Calculate the value of q (including the error), where q is given by: q = :7 7. You measure the radius of a circle and find R = (22.2 i 0.1) cm. What is the area of the circle (including the error)? 8. You measure the radius of a sphere and find R = (22.2 i 0.01) cm. What is the volume of the sphere (including the error)? 9. The radius of a sphere is R = (22.2 i 0.1) cm. The radius of the base of a cylinder is r = (12.0 i 1.2) cm, and its height is h = (24.4 i 1.1) cm. What is the total volume occupied by the sphere and by the cylinder (including the error)