Applied Mechanics and Graphic Statics
One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg. The tension in the string is

25 kg
22.5 kg
17.5 kg
19.5 kg

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Applied Mechanics and Graphic Statics
The following is in unstable equilibrium

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

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