An aerial copper wire (E = 1 × 10^5 N/mm^2) 40m long has cross sectional area of 80 mm^2 and weighs 0.6 N per meter run. If the wire is suspended vertically, calculate: a. the elongation of wire due to self-weight. b. the total elongation when a weight of 200N is attached to its lower end. c. the maximum weight which this wire can support at its lower end if the limiting value of stress is 65 x 10^5 N/mm^2

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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.