(a) A wire that is 1.50 m long at 20.0C is found to increase in length by...

Question:

(a) A wire that is 1.50 m long at 20.0°C is found to increase in length by 1.90 cm when warmed to 420.0°C. Compute its average coefficient of linear expansion for this temperature range.
(b) The wire is stretched just tant (zero tension) at 420.0°C. Find the stress in the wire if it is cooled to 20.0°C without being allowed to contract. Young's modulus for the wire is 2.0 X 1011 Pa.