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Exam 14: Heat

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Question 31

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The specific heat of ice is 2.100 kJ/kg °C, the heat of fusion for ice at 0 °C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg °C, and the heat of vaporization of water at 100.0 °C is 2,256 kJ/kg. What is the final equilibrium temperature when 10.00 grams of ice at −15 °C is mixed with 3.000 grams of steam at 100 °C?

A) 87.21 °C
B) 85.32 °C
C) 80.34 °C
D) 82.56 °C
E) 78.45 °C

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Question 32

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The intensity of solar radiation reaching the Earth is 1,340 W/m² when the temperature of the Sun is 5,800 K. If the temperature of the Sun decreased by 10.0%, then what would be the intensity of solar radiation reaching the Earth?

A) 879 W/m²
B) 752 W/m²
C) 667 W/m²
D) 610 W/m²
E) 578 W/m²

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Question 33

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The specific heat of ice is 2.10 kJ/kg °C, the heat of fusion for ice at 0°C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg °C, and the heat of vaporization of water at 100 °C is 2,256 kJ/kg. What is the final equilibrium temperature when 30.0 grams of ice at −15.0 °C is mixed with 8.00 grams of steam at 100 °C?

The heat of fusion for ice at 0 °C is 333.7 kJ/kg. What is the energy needed to melt 100 grams of ice at 0.00 °C?

The molar specific heat of a diatomic ideal gas at constant volume is Cv = 5/2 R. What is the heat needed to heat 28.00 g of nitrogen gas from 20.00 °C to 85.00 °C?

The inside temperature of a house is 65 °F. When the temperature outside the house is 35 °F, the furnace supplies 100 joules per hour to keep the inside of the house warm. If the temperature outside the house increases to 50 °F, then what is the fuel consumption of the furnace? Assume the house loses heat through conduction only.

The heat of fusion for lead at 327.0 °C is 22.9 kJ/kg and the specific heat of lead is 0.130 kJ/kg °C. What is the energy needed to melt 100 grams of lead starting at 0 °C?

The specific heat of steam is 2,020 J/kg K in SI units. What is the value of the specific heat of steam in cal/g °C?

The heat of fusion for lead at 327 °C is 22.9 kJ/kg and the specific heat of solid lead is 0.130 kJ/kg °C, the specific heat of liquid lead is 0.0900 kJ/kg °C, and the heat of vaporization of lead at 1,620 °C is 871 kJ/kg. What is the energy needed to vaporize 100 grams of lead starting at 0 °C?

A 1,500 W portable heater is needed to replace the heat lost through a circular window (radius 25 cm) in the wall of a home. The window is made of a single pane of glass 0.30 cm thick. The thermal conductivity for the glass is 0.63 W/(m·K) . The temperature inside the house is 20 °C. What is the temperature outside?

A rigid cylinder (15 cm radius, 15 cm height) contains nitrogen gas (N₂) at standard temperature and pressure (0 °C and 1 atm) . What is the total translational kinetic energy of the gas molecules in the cylinder?

The specific heat of ice is 2.100 kJ/kg °C, the heat of fusion for ice at 0 °C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg °C, and the heat of vaporization of water at 100 °C is 2,256 kJ/k. What is the final equilibrium temperature when 10.00 grams of ice at −15.00 °C is mixed with 2.00 grams of steam at 100.0 °C?

The specific heat of ice is 2.10 kJ/kg °C, the heat of fusion for ice at 0 °C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg °C, the heat of vaporization of water at 100 °C is 2,256 kJ/kg, and the specific heat of steam is 2.020 kJ/kg °C. What is the final equilibrium temperature when 40.0 grams of ice at 0 °C is mixed with 5.00 grams of steam at 120 °C?

A 2,000 kg car is traveling at 20.0 m/s and then puts on the brakes and comes to a complete stop. The heat generated at the brakes due to stopping heats up the brakes. The mass of the brake system is 20.0 kg and it has a specific heat of 0.200 kcal/kg °C. What is the increase in the temperature of the brakes?

The specific heat of ice is 2.10 kJ/kg °C, the heat of fusion for ice at 0 °C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg °C, the heat of vaporization of water at 100 °C is 2,256 kJ/kg, and the specific heat of steam is 2.020 kJ/kg °C. What is the final equilibrium temperature when 10.0 grams of ice at −15.0 °C is mixed with 2.00 grams of steam at 120 °C?

What form of convection causes the offshore sea breeze in the evening?

A 1500 W portable heater is needed to replace the heat lost through a circular window (radius 25 cm) in the wall of a home. The thermal conductivity for the glass is 0.63 W/mK. The temperature inside the house is 20 °C and outside is −12 °C. What is the thickness of the window?

Which of the following is NOT included in the internal energy of a system?

The specific heat of ice is 2.100 kJ/kg °C, the heat of fusion for ice at 0 °C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg °C, the heat of vaporization of water at 100.0 °C is 2,256 kJ/kg, and the specific heat of steam is 2.020 kJ/kg °C. What is the final equilibrium temperature when 20.00 grams of ice at −15.0 °C is mixed with 5.000 grams of steam at 120.0 °C?

A food Calorie is a kilocalorie in SI units. What would be the speed of a 1,000 kg car traveling such that its kinetic energy is equal to the energy contained in one 250-Calorie jelly doughnut?