What is the specific heat of a substance if 120 kJ of heat is needed to raise 4.1 kg of the substance from 18 degrees Celsius to 37.2 degrees Celsius?
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What is the specific heat of a substance if 120 kJ of heat is needed to raise 4.1 kg of the substance from 18 degrees Celsius to 37.2 degrees Celsius?
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- The mass of a hot-air balloon and its cargo (not including the air inside) is 200 kg. The air outside is at 10.0C and 101 kPa. The volume of the balloon is 400 m3. To what temperature must the air in the balloon be warmed before the balloon will lift off? (Air density at 10.0C is 1.244 kg/m3.)At 25.0 m below the surface of the sea, where the temperature is 5.00C, a diver exhales an air bubble having a volume of 1.00 cm3. If the surface temperature of the sea is 20.0C, what is the volume of the bubble just before it breaks the surface?Convert the following to equivalent temperatures on the Celsius and Kelvin scales: (a) the normal human body temperature, 98.6F; (b) the air temperature on a cold day, 5.00F.
- A ceramic container used for melting metals (called a crucible) contains 1.30 kg of a molten metal. The liquid metal cools until it reaches its melting point of 1,749°C. A scientist then measures that 2.99 ✕ 104 J of heat is transferred out of the metal before it completely solidifies. What is the latent heat of fusion of this metal, in J/g? (Be careful with units!)If 31.0 g of milk at a temperature of 4.15°C is added to a 250-g cup of coffee at a temperature 91.0°C, what is the final temperature of the mixture? Assume coffee has a specific heat of 4.19 ✕ 103 J/(kg · K) and milk has a specific heat of 3.93 ✕ 103 J/(kg · K).A 100 g glass container contains 250 g of water at 15.0 "C. A 70 g piece of unknown material at 100 °C is added to the water in the container. The final temperature of the mixture is 19.0 °C. What is the specific heat of the unknown material in J/kg "C? (specific heat of water = 4,186 J/kg "C, specific heat of glass=837.2 J/kg "C)
- On a cold winter morning you step outside to get into your car and drive to work. Your car's windshield is covered with ice at −15.3°C. If the area of the windshield is 1.40 m2 and it takes 1.97 105 J of heat to melt the ice, how thick was the ice covering the windshield? The latent heat of fusion of ice is 334 kJ/kg, the specific heat of ice is 2092 J/(kg · °C) and its density is 917 kg/m3.A machine part consists of 0.41 kg of iron (of specific heat 470 J/kg ∙ K ) and 0.44 kg of copper (of specific heat 390 J/kg ∙ K). How much heat must be added to the gear to raise its temperature from 15.3 °C to 71.9 °C? Give your answer in kJ to 2 decimal places.A piece of unknown substance weighs 51.9 g and requires 3040 J to increase its temperature from 23.9°C to 88.6°C. (a)What is the specific heat (in J/g·°C) of the substance? (b) what is the substance?
- How much heat would flow into an 80 cm x 40 cm x 3.0 mm glass window each hour on a day when the outside temperature is 103 F and inside temperature is 70 F? Kglass = 0.84 W/m-K. O 1.64x10³ J/s O 2.96x10² J/s O 1.64x10² J/s O 2.96x10³ J/sOn a cold winter morning you step outside to get into your car and drive to work. Your car's windshield is covered with ice at −14.3°C. If the area of the windshield is 1.40 m2 and it takes 1.77 105 J of heat to melt the ice, how thick was the ice covering the windshield? The latent heat of fusion of ice is 334 kJ/kg, the specific heat of ice is 2092 J/(kg · °C) and its density is 917 kg/m3 (answer in m).If 100.4KJ of heat are added to 6.20 *10 ^2g of water at 22 degrees Celsius, what is the final temperature of the water. Specific heat of water at 1.00atm and 20.0 degrees Celsius is 4.186kJ/kg. K.
