Question

Dr. Terror has developed a new alloy called Ultranomium. He is testing a bar that is 1.35 m long and has a mass of 362 g. Using a carbon dioxide infrared laser, he carfully heats the bar from 23.6 °C to 268 °C. Answer the two questions below, using three significant digits. Part A: If the bar absorbs 80300 J of energy during the temperature change, what is the specific heat capacity (c) of the Ultranomium? J/(Kg) Part B: He notices that at this new temperature, the bar's length has increased by 0.0014 m. What is the coefficient of linear expansion (a) for the new alloy?

Answer 1

C of Energy = 362g m. mass [268 23.6] 80300 » 1000 loc (Answer) (A) specific heat capacity of Ultranomium MIT a = heat = 80300 J. = 362 1000 kg change in temperature = 244.40€ 244.4+273·15=517.55k c (specific heat copacity) 362 * 1655) 362 x (515.55) 428.6 J (k kg) k (1000g) 0.4286 3 Answer (Kg) co-efficient of linear expansion (a) DL a change in Length - original Length DT = change in temp. DL = o.ool4m. Lo=1.35 DT 244.4 °C. 0.0014 1.35% (244.4) 80360 x 1000 428.6 . ( B ) DL ) R Lo (AT) LO 2 2 CS Scanned with CamScanner