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Answers to Quick Quizzes 361 Figure P11.56 Problems 56 and 57. 55. A solid cube of side 2a and mass M is sliding on a friction- less surface with uniform velocity v as in Figure P11.55a. It 2 /3. (Hint: The cube undergoes an in- elastic collision at the edge.) Figure P11.55 56. A uniform solid disk is set into rotation with an an- gular speed ) i about an axis through its center. While still 2a ω Mg M v (a) (b) rotating at this speed, the disk is placed into contact with Suppose a solid disk of radius R is given an angular speed i about an axis through its center and then lowered to a horizontal surface and released, as in Problem 56 (Fig. i /31g. (b) Show that the distance the disk travels before pure 2 ) i 2 /181g. Answers to Quick Quizzes 11.1 (d). This result can be obtained by replacing B " A with $ (A " B), according to Equation 11.4. 11.2 (d). Because of the sin " function, " A " B " is either equal to or smaller than AB, depending on the angle ". 11.3 (a). If p and r are parallel or antiparallel, the angular momentum is zero. For a nonzero angular momentum, 11.4 (c). The angular momentum is the product of the linear momentum and the perpendicular distance from the ro- 11.5 (b). The hollow sphere has a larger moment of inertia than the solid sphere. 11.6 (a). The diver is an isolated system, so the product I) re- mains constant. Because her moment of inertia decreases, 11.7 (a). As the moment of inertia of the diver decreases, the angular speed increases by the same factor. For example, 2 increases by a factor of 4 and the energy in- creases by a factor of 2. 57. |