In an experiment to determine the thermal conductivity of a bar of a new alloy, one end of the bar is maintained at 0.200 °C and the other end at 101 °C. The bar has a radius of 9.00 cm and a length of 43.3 cm. If the rate of heat transfer through the bar is 34.0 W, what is the thermal conductivity of the bar? amazor W/m* C K =
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- 4. A copper bar lies between two heat sources given by T₁ = 100°C and Tc = 20°C. The area of the copper bar is 4.5 cm 2 and its thickness is 15 cm. Calculate the ratio of heat transfer by conduction between both sources. a. 96 J/s b. 9624 J/s c. 962 kJ/s d. 962 J/s 5. Calculate the ratio of heat flow through a window of 4.0 m² and a thickness of 3.5 mm when the indoor and outdoor temperatures are 25°C and 24°C. a. 2143 J/s b. 1143 J/s c. 11.4 J/s d. 1200 J/s 6. Six (6) molecules in a container have the following velocities: 400, 550, 345, 678, 899, 200 m/s. Find the average velocity of the gas molecules. 7. The mass of a molecule of an ideal gas is 3.56 x 10-26 kg. Calculate the speed Vrms at a temperature of 100°C. 8. The temperature of 3.00 mol of an ideal monatomic gas is increased from 30°C to 95°C. The gas is kept at constant volume. Determine the energy transferred as heat. 9. The temperature of 2.00 mol of an ideal monatomic gas is increased by 25 K at constant pressure.…HC-1 A rectangular glass window in your house has dimensions of 2.00 m × 1.50 m and is 3.20 mm thick. The thermal conductivity of the glass is k = 0.840 W m-1 K-1. Suppose the temperature of the air just outside your window is 9.0 °C and inside the temperature is 20.0 °C. (a) What is the rate of heat loss via conduction through the window? Give your answer in units of Watts (W). (b) At this rate, how long will it take to lose 1.00×106 Joules of heat through the window? Give your answer in units of minutes (min).The temperature of a gold bar rises by 10.0°C when it absorbs 0.677 kJ of energy by heat. The mass of the bar is 525 g. Determine the specific heat of gold from these data. kJ/kg · °C
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- Approximately how long should it take 9.5 kg of ice at 0 °C to melt when it is placed in a carefully sealed Styrofoam ice chest of dimensions 25 cm × 35 cm x 55 cm whose walls are 1.1 cm thick? Assume that the conductivity of Styrofoam is double that of air and that the outside temperature is 35 °C. Express your answer using two significant figures. VE ΑΣΦ ? SIn an experiment to determine the thermal conductivity of a bar of a new metal alloy, one end of the bar is maintained at 0.00°C and the other end at 100. °C. The rectangular bar is 2.25 cm x 2.25cm and a length of 0.500 m. If the rate of heat transfer through the bar is 15.0 J/s, what is the thermal conductivity of the bar to 3 sig fig? Material having thermal.conductivity Area A 51 snoIt is desired to just able to slip the 16.0 mm diameter glass marble through an aluminum washer. At 68.0 F, the inner diameter of the washer is 15.98 mm. To what temperature in Fahrenheit should the aluminum washer be heated for the marble just able to slip through. The marble remains at 68.0 F. aluminum = 2.3x10-50 C-1; and glass = 2.7x10-50 C-1. [Answer in 3 significant figures]
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