Two objects A and B are of similar surface nature. The area of the emitting surface of B is as twice as of that of A. If you know that object A is at an absolute temperature T, and that object B is at half of this temperature calculate the ratio of H of object A to H of object B. H is the heat current in radiation of an object. Show all the work needed to derive your answer.
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- Answer the following problem with the complete step-by-step process (showing the given, required, process/solution, and graph if possible). 1. A copper telephone wire has essentially no-sag between poles 35.0 m apart on a winter day when the temperature is 220.0 degrees C. How much longer is the wire on a summer day when the temperature is 35.0 degrees C?PROBLEMS 1.1. In the table below, a number in the top row represents the pressure of a gas in the bulb of a constant-volume gas thermometer (corrected for dead space, thermal expansion of bulb, etc.) when the bulb is immersed in a water triple-point cell. The bottom row represents the corresponding readings of pressure when the bulb is surrounded by a material at a constant unknown temperature. Calculate the ideal- gas temperature T of this material. (Use five significant figures.) PTP, kPa P, kPa 133.32 99.992 33.331 66.661 102.37 204.69 153.54 51.190An object was left in a room of unknown surrounding temperature. The temperature of the object was summarized below with respect to the time t (in minutes) the object was initially observed. Predict and complete the information, i.e. determine the temperature in Celsius when t = 30 minutes. Put your answer accurate up to four decimal places. No need to put in the units of measurement. When t = 0, the temperature of the object is 30 degrees Celsius. When t = 10 minutes, the temperature of the object is 32 degrees Celsius. When t = 20 minutes, the temperature of the object is 33.6 degrees Celsius. When t = 30 minutes, the temperature of the object is unknown. Assume the system obeys Newton’s Law of Cooling and the surrounding temperature of the room did not change.
- 6.1 The thermal energy radiated out of an ingot is proportional to its surface area. Derive an equation for maximum pull rate Vmax that is related to the radius R and length / of the ingot. 6.2 "Heat loss is proportional to surface area." Assume that you have access to a thermometer in your kitchen. Design a conceptual experiment to prove the given statement. Explain possible errors that can occur in your experiment. (You are conducting the experiment in your kitchen; just like your cooking, the experiment does not have to be precise. Welare looking for concepts.)A thermometer, initially at a temperature of 25 oC, is suddenly immersed in a tank of water with a temperature of 100 oC. Assuming that it takes 7.5 s to achieve 90% response, what is the time constant and what temperature will this thermometer read 5 s after immersion? Demonstrate your answers with an EXCEL graphThe porous catalyst pellet shown in Figure 1 has an overall radius R and a thermal conductivity k (which may be assumed constant). Because of the chemical reaction occurring within the porous pellet, heat is generated at a constant rate of Se cal/em s. Heat is lost at the outer surface of the pellet to a gas stream at a constant temperature T, by convective heat transfer coefficient h. Gas bemperature T, Figure I. Sphere with internal heat generation Answer the following questions (a) Make a list of assumptions that apply to the above situation. (b) Set up the differential equation by making a shell energy balance. Show the units for all variables that are used. (c) Specify the proper boundary conditions. (d) Integrate the differential equation with the above boundary conditions to obtain an expression for the temperature profile, and make a sketch of the function profile T(r) (e) What is the limiting form of T(r) when h co? (f) What is the maximum temperature in the system? (g)…
- Problem 2 Calculate the specific heat of Lead (Pb), using both the Einstein model and the Debye model, for temperatures equal to 2, 10, 20, 50, 100, 200, 300, 600, and 800 K. Use ] = 88 K and = 65 K since the specific heat calculated with these values agree with the data well for the whole temperature range. Compare your answer with the values from Touloukian and Buyco*. Explain the low-temperature and high-temperature behavior. *Y.S. Touloukain and E.H. Buyco, Thermophysical Properties of Matter, Vol. 4: Specific Heat-Metallic Elements and Alloys; Vol. 5: Specific Heat-Nonmetallic Solids, IFI/Plenum, New York, 1970.The piston cylinder set shown in Figure 01 contains 1 liter of water at 105 ºC with a titer equal to 0.85 (% steam = 85.00%). When the assembly is heated, the piston moves and when it meets the spring the volume is equal to 1.5 liters. Heating continues until the temperature reaches 600 ºC. Knowing that the piston diameter is 150 mm and that the spring constant is 100 N / mm. Calculate: a) The pressure in the water at the end of the process.b) The total work done.c) The amount of heat transferred to heat the system from 105 ºC to 600 ºC.You evaporate liquid at a rate of 21 mg/s by placing a coil of Nichrome wire in it. You keep a current of 5.0 A running through the coil when the potential difference across is it is 12 V. What is the heat of vaporization of the liquid? Please show a step by step process with equations and given units.
- Given the description and formula, how can I go about the following: One form of energy that exists in every system but is difficult to quantify is heat. Do we account for heat energy in a medium? If so, why do we need to? Explain the mechanism by which heat energy can affect the phenomenon of resonance in sound waves propagating in air. (Hint: Think about what air is made of – atoms and molecules. Think about where energy can go in air that is different from the kinetic energy that atoms and molecules possess.)THERMOMETRY. Show your solutions. A baby’s rectal temperature is measured with a thermometer to be 102 degree Fahrenheit. Express this temperature in degree Celsius (Centigrade). Express 49oC into o Convert 50oC to KelvinBased on the table: What is the enthalpy of vaporization when converted to the unit cal/mol? What is the heat of vaporization (in cal/g) from your previous answer?