[填空题]
A barrel of diameterp; 6hcbuyu tt u0a/)c7 134.122 cb9sxb)d7z ls.r+ (lztbzo. dk;l 1j,pm at 20$^{\circ} $ C is to be enclosed by an iron band. The circular band has an inside diameter of 134.110 cm at 20$^{\circ} $ C. It is 7.4 cm wide and 0.65 cm thick.
(a) To what temperature must the band be heated so that it will fit over the barrel? $\approx$ $^{\circ} $ C(Round to the nearest integer)
(b) What will be the tension in the band when it cools to 20$^{\circ} $ C? N