(a) If a rod of 1025 steel 0.5 m (19.7

(a) If a rod of 1025 steel 0.5 m (19.7 in.) long is heated from 20 to 80°C (68 to 176°F) while its ends are maintained rigid, determine the type and magnitude of stress that develops. Assume that at 20°C the rod is stress free.
(b) What will be the stress magnitude if a rod 1 m (39.4 in.) long is used?
(c) If the rod in part (a) is cooled from 20 to -10°C (68 to 14°F), what type and magnitude of stress will result?