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theoretical value of the specific heat of cadmium in cal/gc
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- Q1: A 1.5mx0.8m double glass window consists of two glass(k=0.78 W/mC) layers with a 4 mm thickness for each layer, seperated by a 10 mm thick of still air gap. If the thermal cnductivity of still air is 0.026 W/mC, what is the rate of heat transfer through the window, if the temperatures of the inner and outer surfaces of the window are 15 and -8°C respectively. يتكون شباك ارتفاعه 0.8m وعرضه 1.5m من طبقتين من الز جـاج 0.78 k=( (°CW/m سمك كل واحدة منهما Am m ومفصولتين بطبقة هوائية سمكها 10mm . إذا كان معامل الانتقال بالتوصيل ل لهواء الساكن W/m °C 0.026 أحسب معدل انتقال الحرارة خلال الشباك إذا كانت درجة حرارة السطح الداخلي ل لشباك C° 15 ودرجة حرارة السطح الخارجي C° 8-. T2 T3 هواء Glass Air Glass Ax, A X, A X3In an annealing process-a process wherein materials such as glass and metal are heated to high temperatures and then cooled slowly to toughen them-the following equation may be used to determine the temperature of a thin piece of material after some time t. T-T 2h environment exp pcL T. initial environment where T = temperature (°C) h= heat transfer coefficient p= density (kg/m³) c= specific heat (J/kg - K) L= plate thickness (m) t = time (s) Those of you who will pursue aerospace, chemical, mechanical, or materials engineering will learn about the underlying concepts that lead to the solution in your heat-transfer class. What is the appropriate unit for h if the preceding equation is to be homogeneous in units? Show all steps of your work.Q1/ The thermal contact conductance at the interface of two 1.5-cm-thick copper plates is measured to be 19,000 W/m2 · °C. Determine the thickness of the copper plate whose thermal resistance is equal to the thermal resistance of the interface between the plates. The thermal conductivity of copper k = 401 W/m°C
- One group of students recorded the following measurements: minner cup 45.36 g %3D mcup set 198.23 g %3D mcup_set+water = 430.17 g %3D mcup_set+water+ice = 471.51 g TH = 58.9 °C TF = 37.4 °C %3D What is the latent heat of fusion of ice according to their measurements in cal/g? Enter the number with proper significant figure. Your Answer: Answer unitsThe initial temperature of a 1.00 L sample of argon is 20°C. The pressure is decreased from 720 mm Hg to 360 mm Hg and the volume increases to 2.14 liters.What was the change in temperature of the argon in Celcius?A wooden ice box has a total area of 1.50 m2 amd walls with an average thickness of 2.0 cm. The box contains ice at 0.0 oC. The inside of the box is kept cold by melting ice. How much ice melts in one day if the ice box is kept in the shade of tree at 29 oC. (Assume the thermal conductivity of wood is 0.16 kJ/s m oC)
- Researchers are conducting a study to quantity the thermal conductivity of a composite material. A square box is made from 1,841 cm2 sheets of the composite insulating material that is 2 cm thick. A 138 W heater is placed inside the box. Sensors attached to the box show that the interior and exterior surfaces of one face have reached the constant temperatures of 89°C and 36°C. What is the thermal conductivity in W/m-K?Water freezes at 0°C at atmospheric pressure (1.01×10° Pa). The densities of water and ice at this temperature and pressure are 1000kg / m and 934 kg / m respectively. The latent heat of fusion is 3.34x10° J/ kg . The pressure required for increasing the melting temperature of ice by 10°C is... GPa. (up to two decimal places)A 19 century lab technician is testing possible metals for bulb filaments. A tantalum filament with a surface area of 0.370 mm and an emissivity of 0.976 radiates 0.80 W of light. Determine the filament's temperature (in K). The melting point for tantalum is 3269 K.
- Two rooms, each a cube 4 m per side, share a 12-cm thick brick wall. Because of a number of 100-W lightbulbs in one room, the air is at 30 deg C, while in the other room it is at 10 deg C. How many of the 100-W bulbs are needed to maintain the temperature difference across the wall? kbrick = 0.84 W/m.K Round your answer to 2 decimal places.Suppose a walrus transfers energy by conduction through its blubber at the rate of 125 W when immersed in -1.25°C water. The walrus’s internal core temperature is 37.0°C, and it has a surface area of 1.85 m2. Chart attached. What is the average thickness of its blubber, in centimeters, which has the conductivity of fatty tissue?the density of lead is 11.0 g/cc at 4°C. What is the density of lead in pounds per cubic feet at this temperature?
