Applied Mechanics and Graphic Statics
A solid cylinder of mass M and radius R rolls down an inclined plane without slipping. The acceleration of center of mass of rolling cylinder is (where ‘g’ is acceleration due to gravity and 0 is inclination of plane with horizontal.)

(2/3) g cos 9
(1/3) g sinB
g sin 9
(2/3) g sin 0

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Applied Mechanics and Graphic Statics
The following is in unstable equilibrium

A uniform solid cone resting on a generator on a smooth horizontal plane
A solid cube resting on one edge
A satellite encircling the earth
A uniform solid cone resting on its base on a horizontal plane

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