21. The force in the brake cable of the V-brake system shown in the figure is T = 200 N. The pivot pin at A has diameter d, = 6 mm and length L, Use dimensions show in the figure. Neglect the weight of the brake system. (a) Find the average shear stress Taver in the pivot pin where it is anchored to the bicycle frame at B. (b) Find the average bearing stress opaver in the pivot pin over segment AB. = 16 mm. T. Lower end of front brake cable D T 81 mm Brake pads Hc 25 mm НЕ HB HF B Pivot pins anchored to frame (dp) Lp

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.