8-65. Determine the smallest force P needed to lift the 3000-lb load. The coefficient of static friction between A and Cand between B and D is µ, = 0.3, and between A and %3D Bµ', = 0.4. Neglect the weight of each wedge.

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British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.