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Theory of Machines Miscellaneous

  1. A uniform disc with radius r and a mass of m kg is mounted centrally on a horizontal axle of negligible mass and length of 1.5r. The disc spins counter-clockwise about the axle with angular speed ω, when viewed from the right-hand side bearing, Q. The axle precesses about a vertical axis at ωp = ω/10 in the clockwise direction when viewed from above. Let RP and RQ (positive upwards) be the resultant reaction forces due to the mass and the gyroscopic effect, at bearing P and Q, respectively. Assuming ω² r = 300 m/ s² and g = 10 m/s², the ratio of the larger to the smaller bearing reaction force (considering appropriate signs) is ____.
    1. -3
    2. -2
    3. -1
    4. 0
Correct Option: A



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