5/4/2016 11:00 AM A Time Remaining: 52 M44s Gradebook Question 7 of 8 Map saplin

Question

5/4/2016 11:00 AM A Time Remaining: 52 M44s Gradebook Question 7 of 8 Map sapling learning this question was written by Sean Cordry at Walters State Community College Dr. Terror has developed a new alloy called Ultranomium. He's testing a bar that is 1.35 m long and has a mass of 382 grams. Using a carbon-dioxide infrared laser, he carfully heats the bar from 23.6 °C to 268 "C Answer the two quesitons below, using three significant digits. Part A: If the bar absorbs 8.03 x 104 J of energy during the temperature change. what is the specific heat capacity (c) of the Ultranomum? Number K/ J.g Part B: He notices that at this new temperature, the bar's length has increased by 1.22 x 103 m. What is the coefficient of linear expansion (a) for the new alloy? Number Previous Next Save And Exit

Explanation / Answer

a)
Q = m*c*dT
where Q = energy transferred
m = mass
c = specific heat capacity
dT = temperature change

8.03*10^4 = 382*c*(268-23.6)

c = 0.8601 J/gC

b)
a = dL / li * dT

a = (1.22*10^-3)/(1.35*(268-23.6))

or a = 3.69 * 10^-6

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