A plain concrete beam  has cross-sectional dimensions of  15  in. by  15  in. The concrete is known  to  have a  modulus  of  rupture fr  =  340  psi.  The  beam  spans  between  simple  supports. Determine the  span  length at which  this  beam will fail  due  to its  own  weight.  Assume  unit weight of  145 pcf

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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.