1) If an object is heated, the temperature of the object will increase. The thermal energy (Q) associated with a change

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1 If An Object Is Heated The Temperature Of The Object Will Increase The Thermal Energy Q Associated With A Change 1 (150.32 KiB) Viewed 46 times

1) If an object is heated, the temperature of the object will increase. The thermal energy (Q) associated with a change in temperature (AT) is a function of the mass of the object (m) and the specific heat (Cp). Specific heat is a material property, and values are available in literature. In an experiment, heat is applied to the end of an object, and the temperature change at the other end of the object is recorded. An unknown material is tested in the lab, yielding the following results: 2 8 10 13 Heat applied (Q) [J] Temp change (AT) [K] 18 14.0 27 22.0 1.5 6.0 7.0 9.0 a) Use MS Excel to plot the data (Q vs AT) with ‘xy scatter' type plot. The plot should have the appropriate axis legends. b) On the same figure, fit a linear equation using 'add trendline' option in Excel. Show the resulting equation and the R2 value on the figure. What is R2 value? (What does it represent?). Did you set the 'intercept' to zero? Why? Why not? c) If the material was titanium, what mass of sample was tested? (use the table below). d) If a 4-gram sample was used, which of the following materials was tested? (use the table below). Material Aluminum Copper Iron Lead Molybdenum Titanium Specific Heat Capacity (Cp) [J/g K)] 0.91 0.39 0.44 0.13 0.30 0.54