A steel marble of 10 g is spun so that it rolls at 150 rpm around the inner of a vertically oriented steel tube. The tube is around 12 cm in diameter. Suppose that the rolling resistance is negligible adequate for the marble to maintain 150 rpm for some seconds. Throughout this time, will the marble spin in the horizontal circle, at constant height, or will it spiral down within the tube? Verify your answer. Take coefficient of static friction to be 0.8.