öaslg äbäi With rise in temperature , the conductivity of the metals depending on temperature remains constant decreases Increases نقطة واحدة When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by conduction and convection radiation conduction convection
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A: True
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A: following is the answer
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A: Below is the answer to the question mentioned.
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A: Every medium offers the resistance to heat transfer
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- 1. The boiling temperature of water is 100 °C. If you put boiling water in a mugplaced at the table top, you observed that after some time the water cools down,decreasing the temperature of water in the mug. Why is this so? Explain using theZeroth Law of Thermodynamics. What happens to objects when temperature increases? For instance, a jar cover an be removed by putting the cover in hot water. Why is this so?The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm) is -196°C. Therefore, nitrogen is commonly used in low temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196°C until the liquid nitrogen in the tank is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3 at 1 atm. Consider a 3-m-diameter spherical tank initially filled with liquid nitrogen at 1 atm and 196°C. The tank is exposed to 22°C ambient air with a heat transfer coefficient of 22 W/m2 · °C. The temperature of the thin-shelled spherical tank is observed to be almost the same as the temperature of the nitrogen inside. Disregarding any radiation heat exchange, determine the rate of evaporation of the liquid nitrogen in the tank as a result of the heat transfer from the ambient air in kg/sec. Answer in…The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196 °C. Therefore, nitrogen is commonly used in low-temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196 °C until it is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3 at 1 atm. Consider a 3-m-diameter spherical tank that is initially filled with liquid nitrogen at 1 atm and -196 °C. The tank is exposed to ambient air at 15° C, with a combined convection and radiation heat transfer coefficient of 35 W/m2⋅K. The temperature of the thin-shelled spherical tank is observed to be almost the same as the temperature of the nitrogen inside. Determine the rate of evaporation (in kg/s) of the liquid nitrogen in the tank as a result of the heat transfer from the ambient air if the tank is insulated with…
- In the figure, the photographs of the shape change of the sample at the characteristic temperatures of this analysis are given in an unordered manner. Arrange the given photos in the correct order they should be.For which solid is the lumped system analysis more likely to be applicable: an actual apple or a golden apple of the same size? Why?plz answer this ASAP,thx One surface of a copper plate that is 3 cm thick has a constant temperature of 400 ° C while the temperature of the other surface is kept constant at 100 ° C. Describe the temperature profile and how much heat is transferred across the plate ?, k copper = 380 watts/m.k with a cross -sectional area of 4 cm².
- Either free or forced convection is good by considering an example. please explainWhat is the heat stored the fluid in a geothermal reservoir 15 km² and 350 m thick with a uniform porosity of 35% if the fluid is single phase liquid water at 270°C?A spherhe of aluminium is staying in an air atmosphere . Develop an equation of the tempeture distribution inside the sphere, with respect to the time. given: Ti- initial temperature of the aluminium ( homogeneous) Ta- air temperature (constant) k -conduction coefficient of aluminium hinf- convective coefficient air
- A spherhe of aluminium is staying in an air atmosphere . what would be the change in the internal energy of the sphere with respect to the time given: Ti- initial temperature of the aluminium ( homogeneous) Ta- air temperature (constant) k -conduction coefficient of aluminium hinf- convective coefficient air Cp CvHello, Please listen to me carefully. I need "What is the temperature of the Sun (google for the answer)? What is there-entry temperature of the Space Shuttle (google for the answer)? Whydon’t you burn up at the reentry temperature that you’ve calculated for thisMach 20 flow? The answer to this question will lead you to recognize thatFigure 4.6 is wrong and that the body should actually re-enter the Earth’satmosphere in the opposite direction. (ie.. blunt/flat surface first.)" to be answered based on the main question ******Dont solve for the main question as I dont want it. ******A food product wants to be produced in a small round shape (pellet) by freezing it in a water blast freezer freezer. Air freezer operates at a temperature of -40 ° C. The initial product temperature is 25 ° C. The pellet has a diameter of 0.5 cm, and a density of 980 kg / m³. The initial freezing temperature is -2.5 ° C. The latent heat of freezing of the product is 280 kJ / kg. The thermal conductivity of the frozen product is 1.9 W / (m ° C). The convective heat transfer coefficient is 50 W / (m² K). Calculate the freeze time.