A mobile phone has a small motor with an eccentric mass used for vibrator mode. The location of the eccentric mass on motor with respect to the center of gravity (CG) of the mobile and the rest of the dimensions of the mobile phone are shown. The mobile is kept on a flat horizontal surface.
In addition, eccentric mass = 2 grams, eccentricty = 2.19 mm, mass of the mobile = 90 grams and g = 9.81 m/s2. Uniform speed (in RPM) of the motor for which the mobile will get just lifted off the ground at the end Q is approximately
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