A 600 g steel block rotates on a steel table (μk = 0.6) while attached to a 1.1 m long hollow tube. Compressed air fed during the tube and ejected from a nozzle on the back of the block exerts a thrust force of 4.6 N perpendiculars to the tube. The maximum tension the tube can withstand without breaking is 50 N. If the block starts from rest, how many revolutions does it make before the tube breaks?