8. (a) If a rod of brass 0.35 m 15 to 85°C while its ends are maintained rigid, long is heated from determine the type and magnitude of stress that devebps. Assume that at 95°C the rod is stress free. (b) Also calculate the stress magnitude if a rod I'm long is used. [ Linear coeft. of brass = 20.0 x10°/c]
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