A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.4 m x 1.9 m. On a certain day, the indoor temperatu 24°C and the outdoor temperature is 0°C. (a) What is the rate at which energy is transferred by heat through the glass? W (b) How much energy is lost through the window in one day, assuming the temperatures inside and outside remain constant?
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- Alcohol thermometers can measure temperatures in the range of 100 F to 200 F Determine the temperature at which an alcohol thermometer with a Fahrenheit scale will read the same number as a thermometer with a Celsius scale.A double-pane glass window consists of two pieces of glass, each having athickness of 8 mm, with a thermal conductivity of k = 1.4 W⁄m ⋅ K . The twoglass panes are separated by an air gap of 10 mm, as shown in Figure 11.10 .Assuming the thermal conductivity of air to be k = 0.025 W⁄m ⋅ K , determinethe total R-value for this window. The total thermal resistance of the window is obtained by adding the resistance offered by each pane of glass and the air gap in the following manner:A long steel I-beam used in bridge construction has a length of 15.0 m. The beam may be exposed to temperatures as low as −22°C in the winter and as high as 33°C in the summer. What is the difference in length of the beam between these two temperature extremes? (Give the absolute value of the difference. Enter your answer in mm.)
- The inside temperature of an oven is maintained at 230° C while the kitchen air temperature is 25° C . What is the oven/kitchen air temperature difference in degrees Celsius and kelvins?A glass of a hot water has an initial temperature 80°C, placed in a room where the temperature is 30°C. After one minute the water temperature drops to 70°C. What will be the temperature after 3 minutes? At what time the water cools down to 40°C?Fluid Mechanics Last Fall, researchers using an unmanned submarine discovered a coral reef at the unprecenented depth of 1/2 mile. The density of seawater at the surface of the ocean is 1025kg/m3 and the bulk modulus of elasticty of seawater is 2.34*109 Pa. A volume of air is taken downward to the coral reef. Assuming an absolute air pressure at the ocean surface of 1 atm, and that the air taken to the reef behaves as an isothermal gas. Find the pressure of the air at that depth. Find the fractional change in denisity and volume of the air at that depth.
- Calculate the heat loss from a double-pane glass window consisting of two pieces of glass, each having a thickness of 10 mm with a thermal conductivity of k = 1.3 W/m.K . The two glass panes are separated by an air gap of 7 mm. Assume thermal conductivity of air to be k = 0.022 W/m.K .A heat pump supplies heat energy to a house at the rate of 140,000 kJ/h when the house is maintained at 25°C. Over a period of one month, the heat pump operates for 100 hours to transfer energy from a heat source outside the house to inside the house. Consider a heat pump receiving heat from two different outside energy sources. In one application the heat pump receives heat from the outside air at 0°C. In a second application the heat pump receives heat from a lake having a water temperature of 10°C. If electricity costs $0.105/kWh, determine the maximum money saved by using the lake water rather than the outside air as the outside energy source.An electrical current flows through a long bar, generating thermal energy at a rate uniform volumetric of q = 2 × 105 W/m 3. The bar is concentric with a hollow ceramic cylinder, creating an air-filled space between the two. If the external surface temperature cannot exceed 40 °C, what is the minimum speed that the ambient air should be blown? the neighborhood meets at 25 °C and the emissivity of the ceramic is 0.8. If the bar has an emissivity of 0.2, what is the bar surface temperature?
- A steel tape with a coefficient of thermal expansion of 0.0000116/°C is known to be 50 m long at 20°C. The tape was used to measure a line that is 642.90 m long when the temperature was 35ºC. a) Calculate the temperature correction per tape length. b) Calculate the correction for the measured line. c) Calculate the correct length of the measured line.A slab of concrete used in highway construction is set in place when the ambient temperature is 20.0C. If its length at that time is 20.478m, calculate the minimum gap required between concrete slabs if buckling is to be prevented. Assume the maximum temperature that will be reached is 55C. Use a = for the coefficient of thermal expansion of concreteA tank having a volume of 0.85 m3 initially contains water at 260 oF and x = 0.7. Saturated vapor is slowly withdrawn at the top of the tank as energy is transferred by heat to maintain constant pressure. The process continues until the tank is filled with just saturated vapor. Determine the heat transferred in kJ. Show all your calculations.