A brass wire 1.8 m long at 27 ∘∘C is held taut with little tension between two rigid supports. If the wire is cooled to a temperature of –39 ∘∘C, what is the tension developed in the wire, if its diameter is 2.0 mm? Co-efficient of linear expansion of brass = 2.0 ×× 10−510−5 K−1K−1; Young’s modulus of brass = 0.91 ×× 10111011 Pa.

A 0.050 0-kg ingot of metal is heated to 200.0∘∘C and then dropped into a beaker containing 0.400 kg of water initially at 20.0∘∘C. If the final equilibrium temperature of the mixed system is 22.4∘∘C, find the specific heat of the metal.