1. A quartz sphere is 14.0 cm in diameter. What will be its change in volume if its temperature is increased by 280 °F? (the coefficient of volume expansion of quartz is 1.50 x10-6 °c-1) X 4.789 cm³
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- One easy way to reduce heating (and cooling) costs is to add extra insulation in the attic of a house. Suppose the house already had 15 cm of fiberglass insulation in the attic and in all the exterior surfaces. If you added an extra 8.0 cm of fiberglass to the attic, then by what percentage would the heating cost of the house drop? Take the single story house to be of dimensions 10 m by 15 m by 3.0 m. Ignore air infiltration and heat loss through windows and doors.A Styrofoam box has a surface area of 0.80 m and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0C, and the outside temperature is 25C. If it takes 8.0 h for 5.0 kg of ice to melt in the container, determine the thermal conductivity of the Styrofoam.A Styrofoam box has a surface area of 0.80 m and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0C, and the outside temperature is 25C. If it takes 8.0 h for 5.0 kg of ice to melt in the container, determine the thermal conductivity of the Styrofoam.
- 1. A container used to store ice is made of wood 5.0 cm thick and has an effective area of 12,000 cm2 and thermal conductivity of 0.00027 cal/cm2 -sec-C/cm. How much ice inside the box would be melted each 24-hour day if the outside temperature is 25C and the temperature inside the box is 5C. Include FBD1.A container used to store ice is made of wood 5.0 cm thick and has an effective area of 12,000 cm2 and thermal conductivity of 0.00027 cal/cm2-sec-°C/cm. How much ice inside the box would be melted each 24-hour day if the outside temperature is 25°C and the temperature inside the box is 5°C.1. How much heat is conducted in one hour through an iron plate 2.0 cm thick and 100 cm2 in area, the temperature of the two sides being kept at 0 and 20°C? 2. A nickel plate 0.8 cm thick has a temperature difference of 64°C between its faces. It transmits 200kcal/hr through an area of 10cm2. Calculate the thermal conductivity of nickel in cgs units. 3. A container used to store ice is made of wood 5.0 cm thick and has an effective area of 12,000 cm2 and thermal conductivity of 0.00027 cal/cm2-sec-°C/cm. How much ice inside the box would be melted each 24-hour day if the outside temperature is 25°C and the temperature inside the box is 5°C.
- 11. A tank of 10ft3 capacity is half filled with glycerin. The weight density of glycerin is 78.6 lbs/ft3 and its specific heat is 0.57 BTU/lb-°F. (a) How much heat is needed to raise the temperature of glycerin from 40°F to 70°F? (b) If the heat supplied to the glycerin is at a rate of 750 BTU/min, at what rate does its temperature rises? 12. How much joules are needed to change 100 grams of water at 10°C to steam at 120°C1.One end of a 40 cm metal rod 2.0 cm2 in cross section is in a steam bath while the other end is embedded in ice. It is observed that 13.3 grams of ice melted in 15 minutes from the heat conducted by the rod. What is the thermal conductivity of the rod.31 - In a place where the pressure is 102 kPa and the temperature is 33ºC, the mouth of an empty 27-liter bottle is opened and filled with air. What is the mass of the air filled into the bottle? a) 0.0407 kg B) 0.0229 kg NS) 0.0026 kg D) 0.0019 kg TO) 0.0314 kg
- 2. What mass of water will change its temperature by 3 celcius when 525 J of heat is added to it? The specific heat of water is 4180 J/kg Celsius1. Consider a person whose exposed surface area is 1.7 m2, emissivity is 0.85, and surface temperature is 30℃. Determine the rate of heat loss from that person by radiation in a large room whose walls are at a temperature of (a) 300K and (b) 280K.1) The best laboratory vacuum has a pressure of about 1.00 x 10-18 atm, or 1.01 x 10-13 Pa. How many gas molecules are in 5.30 cm3 in such a vacuum at 333 K? 2) Ethyl alcohol has a boiling point of 78.0 ˚C, a freezing point of -114 ˚C, a heat of vaporization of 879 kJ/kg, a heat of fusion of 109 kJ/kg, and a specific heat of 2.43 kJ/kg·K. How much energy must be removed from 0.534 kg of ethyl alcohol that is initially a gas at 78.0 ˚C so that it becomes a solid at -114 ˚C? 3)How much water remains unfrozen after 50.3 kJ is transferred as heat from 276 g of liquid water initially at its freezing point? The latent heat of fusion is 333 kJ/kg.