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Part A Find the resistivity for the material of the rod at 20.0°C. Express your answer in ohm-meters. A 1.30 m cylindrical rod of diameter 0.550 cm is connected to a power supply that maintains a constant potential difference of 15.0 V across its ends, while an ammoter measures the current through it. You observe that at room temperature (20.0°C) the ammeter reads 18.5 A, while at 92.0°C it reads 17.2 A. You can ignore any thermal expansion of the rod. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Temperaturo dependence of resistance ΨΗ ΑΣΦ ? pe n.m Submit Begvest Answer Part B Find the tomperature coefficient of resistivity at 20.0°C for the material of the rod. Express your answer In reciprocal degrees Celsius to two significant figures 190 AED ? (°C) Submit Request Answer

Part A A copper transmission cable 160 km long and 10.5 cm in diameter carries a current of 115 A. For related problemsolving tips and stratogios, you may want to view a Video Tutor Solution of A source in an open circuit What is the potential drop across the cable? Express your answer in volts. VOI ΑΣΦ 2 VE V Submit Request Answer Part B How much electrical energy is dissipated as thermal energy every hour? Express your answer in Joules. V AEC ? AE - Submit Request Answer