An aluminum-alloy rod has a length of 9.9269 cm at 30.00°C and a length of 9.9686 cm at the boiling point of water. (a) What is th length of the rod at the freezing point of water? (b) What is the temperature if the length of the rod is 9.9324 cm? (a) Number i (b) Number i Units Units
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- Calculate the heat you need to take/give to make all 1 kg of mercury at a temperature of 357⁰C at a temperature of 1 ATM at a temperature of -39⁰C at constant pressure. (Freezing Point for Mercury: -39⁰C, Boiling Point: 357⁰C, Melting Heat: 11.8 kJ/kg, Evaporation Heat: 27.2 kJ/kg, Average Specific Heat (for liquid mercury): 0.14 J/(g⁰C) )What is the ΔH(vap)° of a liquid that has a vapor pressure of 621 torr at 85.2°C and a boiling point of 95.6°C at 1 atm?Water is boiled at 250°F by a 2-ft-long and 0.5-in diameter nickel-plated electric heating element maintained at 280°F. Determine (a) the boiling heat transfer coefficient, (b) the electric power consumed by the heating element, and (c) the rate of evaporation of water.
- A new temperature scale, °W is desired with freezing of water at 24°W and boiling point atatmospheric at 940°W. Determine the equivalent of 110°F in °W.Explain the P-v-T surface of a substance that expands on freezing (like water).If 10kg of water at 920kPa pressure and at 600C is heated to boiling point, then to dry saturated steam and then to superheated steam at a temperature of 2100C, determine: The sensible heat and latent heat
- Water in a tank is to be boiled at 143.27 Pa absolute pressure by a 1.5-cm-diameter brass heating element equipped with electrical resistance wires inside, as shown in the figure. Determine the maximum heat flux that can be attained in the nucleate boiling regime and the surface temperature of the heater in that case. (3.23x105 W/m2, 118.6°C)(About measuring specific heat capacity) Since metal sample can be heated to any desired temperature value, say, 65°C or 156°C. Why is it practical to set the initial temperature of the metal sample near the boiling point of water? In connection to this, why should the dipper be partly submerged in the water while heating the metal sample?There is a long rod, insulated to avoid any heat loss on its sides, is in perfect thermal contact with the boiling water (at atm pressure) at of the one end and with the ice-water mixture. The rod has a 1.00 m section of copper (with one end in boiling water) connected and joined together end-to-end to a length, L2, of steel (with one end in the ice water). Both sections of the rod have cross-sectional areas = 4.00 cm2. The temperature of the copper-steel junction is 65.0 °C after a steady state has been met. How much heat per second flows from the boiling water to the ice-water mixture? kCopper = 380 W/m*K kStainless Steel = 50 W/m*K A. How much heat per sec (watts) flows from boiling water to ice water mixture? B. Find the length L2 of steel section in meters
- Four cubic meters of water is to be heated by means of four 1.5 kW, 230-V immersion heating elements. Assuming the efficiency of the heater as 90%, determine the time required in boiling the water if the initial temperature is 20°C and if the elements are connected two in series in parallel with two in series. the answer is 275.6 hrs (According to the ECE board exam answer key) can you show me the solution?In boiling water at 1 atm pressure outside a stainless-steel tube with a surface temperature of 410F, the heat-transfer coefficient h in the absence of radiation is 32 Btu/h*ft^2*F. If the emissivity of the stainless steel is 0.8, will radiation significantly augment the rate of boiling (e.g., by more than 5 percent)? Assume that the vapor film is transparent to radiation and the boiling liquid is opaque.A ceramic heating element is immersed in an insulated container of liquid argon at its boiling point. If the heating element generates 40.0 J of heat energy per second, how many kilograms of argon are boiled away in a period of 5.00 h? The heat of vaporization and boiling point respectively for argon are 162 kJ/kg and −186 °C