11.The ratio of the speed of a rolling cylinder to the speed of sliding cylinder is

12.A sphere and a cylinder having the same mass and radii start from rest and roll down the same inclined plane. Which body gets to the bottom first ?

13.A uniform pyramid and a uniform prism of same height lie with their base on the surface. Which is more stable ?

14.A symmetrical body is rotating about its axis of symmetry, its moment of inertia about the axis of rotation being 2 kg m2 and its rate of rotation 2 revolutions/see. The angular momentum of the body in kg-m2/sec is

15.The angles between two forces to make their resultant a minimum and a maximum respectively are