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Title: The surface of the Sun is at approximately 5 700 K and the temperature of the Earth's surface is ... Post by: abbyraelax on Feb 23, 2018 The surface of the Sun is at approximately 5 700 K and the temperature of the Earth's surface is about 290 K. What total entropy change occurs when 1 175 J of heat energy is transferred from the Sun to the Earth?
a. 4.05 J/K b. 3.85 J/K c. 0.206 J/K d. 4.26 J/K e. 6.05 J/K [Ques. 2] Using a capacitor and two different value resistors, which of the following combinations in an RC circuit would give the greatest time constant? a. the capacitor in series with both resistors in series with each other b. the capacitor in series with both resistors in parallel with each other c. the capacitor in series with the higher value resistor d. the capacitor in series with the lower value resistor [Ques. 3] An avalanche of ice and snow of mass 1 500 kg slides a vertical distance of 190 m down a mountainside. If the temperature of the ice, snow, mountain and surrounding air are all at 0C, what is the change in entropy of the universe? a. 2.05E+4 J/K b. 1.02E+4 J/K c. 5.12E+3 J/K d. 3.41E+3 J/K e. 1.04E+3 J/K [Ques. 4] An uncharged, series RC circuit is connected across a battery. For which situation will the time for the capacitor to reach 90 of its final charge remain unchanged? a. The RC time constant is doubled. b. The battery voltage is doubled. c. A second resistor is added in series with the original resistor. d. All of these situations result in the time for the capacitor to reach 90 of its final charge to change. [Ques. 5] What is the change in entropy (S) when one mole of silver (101 g) is completely melted at 961C? (The heat of fusion of silver is 8.82 104 J/kg.) a. 9.27 J/K b. 7.22 J/K c. 3.61 J/K d. 14.4 J/K e. 5.22 J/K [Ques. 6] In a circuit involving resistance and capacitance, which of the following choices would result in the longest time constant? a. R = 100 , C = 30 F b. R = 300 , C = 150 F c. R = 75 , C = 75 F d. R = 200 , C = 200 F [Ques. 7] 2.20 kilograms of water at 1.00 atm at the boiling point of 100C is heated until all the water vaporizes. What is its change in entropy? (For water, Lv = 2.26 106 J/kg) a. 2.67E+4 J/K b. 1.33E+4 J/K c. 6.66E+3 J/K d. 4.44E+3 J/K e. 1.82E+4 J/K [Ques. 8] In order for a circuit to respond quickly, its time constant should be short. In a circuit involving resistance and capacitance, which of the following choices would result in the shortest time constant? a. R = 75 , C = 75 F b. R = 200 , C = 200 F c. R = 300 , C = 75 F d. R = 100 , C = 30 F [Ques. 9] A 2.65-kg block of ice is at STP (0C, 1 atm) while it melts completely to water. What is its change in entropy? (For ice, Lf = 3.34 105 J/kg) a. zero b. 1 620 J/K c. 811 J/K d. 3 240 J/K e. 6 480 J/K [Ques. 10] An RC circuit with resistance R0 and capacitance C0 has a time constant 0 . Which of the following additions to the circuit would result in the time constant doubling? a. a capacitor with capacitance 3C0 in series with the original C0 b. a capacitor with capacitance C0 in series with the original C0 c. a capacitor with capacitance 3C0 in parallel with the original C0 d. a capacitor with capacitance C0 in parallel with the original C0 Title: The surface of the Sun is at approximately 5 700 K and the temperature of the Earth's surface is ... Post by: Aopok on Feb 23, 2018 Content hidden
Title: The surface of the Sun is at approximately 5 700 K and the temperature of the Earth's surface is ... Post by: abbyraelax on Feb 23, 2018 God bless you! Helped my grade so much.
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