A glass vessel with an insulating cover with a surface area of (Z + 100) cm² and (Z + 15) mm thick is filled with ice at 0° C and placed in a second vessel maintained at a temperature of 100° C. Find the mass of the ice that melts per minute when the flow of heat becomes steady. Latent heat of ice = 3.3 x 105 J/kg and K for glass = 1.0 W /mK. %3!
Q: Steel balls (diamęter = 21 mm, p= 7833 kg/m , k = 54 W/m-°C, Cp = 0.465 kJ/kg-°C, and a = 1.474x10 m…
A:
Q: Carbon steel balls (p=7833 kg/m³, k=54 W/m.°C, Cp=0.465 kJ/kg.K ) 10 mm in diameter are annealed by…
A:
Q: Layers of 6-in-thick meat slabs (k = 0.26 Btu/h·ft·°F and a = 1.4 * 1026 ft2/s) initially at a…
A: Given data: Thermal conductivity of metal slab, K= 0.26 Btu/h.ft.0F Thermal diffusivity of metal…
Q: Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass…
A: Given, Area of the window, A=1.2m×2m=2.4m2 The inside temperature of the room, T∞1=24°C The…
Q: A small spherical ball having diameter of d= 20 cm and at temperature of 150 °C is placed in a water…
A:
Q: Isabelle pour 158cm3 of glycerin, at a temperature of -12 oC, into a graduated cylinder initially at…
A: Given data, Vi,gly = Initial volume of the glycerin = 158 cm3 Ti,gly = Initial temperature of the…
Q: total rate of heat transfer from the cubes to the ambient air, when 2700 cubes are to be annealed…
A: Assumptions 1 The balls are spherical in shape with a radius of r0 = 4 mm. 2 The thermal properties…
Q: 3 cm diameter Aluminum sphere (k = 204 W / mK, p = 2700 kg / m² and C = 896 J / Kg.K initially at…
A: Given Data Diameter of Aluminum sphere = 3Cm K=204 W/mK p = 2700 kg / m² and C = 896 J / Kg.K time…
Q: An 8-cm-diameter potato (p = 1100 kg/m2, C, = 3900 J/kg °C, k = 0.6 %3D W/m °C, and a = 1.4 x 10-7…
A: Given data as per the question Diameter of potato =8 cm Initial temperature =250 c The temperature…
Q: The water vapor is manually compressed in an unknown process until the volume of water vapor (Vw2)…
A: Given that, Mass of air, ma=0.4 kg,Pressure of air, Pa1=250 kPa,Temperature of air, Ta1=300 K,Mass…
Q: A spherical pellet (ρ =1000 kg/m3 , c = 1000 J/(kg⋅K)) with a radius ro = 1 cm is cooled from an…
A: Given Data ρ =1000 kg/m3 , c = 1000 J/(kg⋅K) ro = 1 cm h = 100 W/(m2 K) Ans(a) k = 0.1 W/(m⋅K)…
Q: Question: An ordinary egg can be approximated as a 5.5-cm-diameter sphere. The egg is initially at a…
A: given data diameter (D) = 5.5 cm C initial temperature (Ti) = 8oC Boiling water temperature (Tb) =…
Q: A glass container has a total wall area (including the lid) of 1.75 m² and a wall thickness of 1.5…
A:
Q: A 1.5 cm diameter ball bearing at a temperature of 100 C is cooled by passing water at 27 C and a…
A: Given: temperature of the bearing→Tb=100°C Temperature of the water→Tw=27°C Velocity of the…
Q: In a ball bearing production facility, steel balls (k=50 W/m.K, c=0.460 kJ/kg.K, ρ=7865 kg/m3) that…
A: Given: The thermal conductivity of the steel balls, k = 50 W/m.k The specific heat of ball, c = 0.46…
Q: 3. A metallic rod 20 cm long is heated to a uniform temperature of 100° C. At t = 0 the ends of the…
A: Write down the given value using suitable variables. Here l signifies rod length, T signifies…
Q: An ice chest is constructed of Styrofoam [k = 0.033 W/m.°C] with inside dimensions of 25 by 40 by…
A: Write the given data with suitable variables. k=0.033 W/m-°CL×B×H=25 cm×40 cm×100 cm=0.25 m×0.40 m×1…
Q: Example 9: A 2-kW resistance heater wire whose thermal conductivity is k = 15 W/m °C has a diameter…
A:
Q: result? Why? 4. What is the minimum amount of ice at 0°C that must be added to the contents of a can…
A: Write the given data in the problem. V=340 ml Ti=20.5°C Tf=0°Cρw=1 g/ml L=335 J/gcw=4.184 J/g·K…
Q: A block of ice at a temperature of 0∘C is crushed by a 5.2 kg mass piston being dropped a distance…
A:
Q: A carbon steel pipe (thermal conductivity of 38 W/m oC) with an external diameter of 5 cm and a wall…
A: Given : Kpipe= 38 W/mC D = 5 cm t= 4 mm t = 28 C T = 120 C To find : Heat lose per meter Insulation…
Q: An aluminum bucket contains 0.800 kg of water at an equilibrium temperature of 25.0 °C. The water is…
A:
Q: n iron ball (p 7833 ,k = 54. °C , Cp = 0,465.°C) has a diameter of 8 m3 kg m he ball initially has a…
A:
Q: 12mm diameter Steel balls are annealed by heating to 1150 K and then slowly cooling to 400K in an…
A: Data given - D = 12 mm Ti = 1150 K T∞ = 325 K h = 20 W/m2 K ρ = 7800 kg/m3 Cp = 600 J/kg K
Q: A small copper wire with a diameter of 0.792 mm and initially at 366.5 K is suddenly immersed in a…
A: Given k = 374 W/m · K, cp = 0.389 kJ/kg · K, ρ = 8890 kg/m3. h = 85.2 W/m2 · K Find Time, t Heat…
Q: In a piston cylinder system, the gas an initial pressure of 100 kPa and expands from 1.5 m3 to 7.5…
A:
Q: The 4cm thick large copper plate, initially at a uniform temperature of 25 °C, is heated by passing…
A: Given data: Thickness of copper plate = 4 cm The initial temperature of the…
Q: A copper sphere having a diameter of 3.0 cm is initially at a uniform temperature of 50°C. It is…
A: Given data
Q: A block of ice at a temperature of 0∘C is crushed by a 5.2 kg mass piston being dropped a distance…
A:
Q: A 1-cm diameter, 1 % carbon steel sphere, initially at 200 ⁰C, is cooled by natural convection, with…
A: d=1cm
Q: Steel balls (diameter 21 mm, p 7833 kg/m', k 54 W/m:°C, Cp 0.465 kJ/kg.°C, and a = 1.474x10 m/s) are…
A: We will use lumped parameter analysis for this problem critical length Lc = Volume / area =Diameter…
Q: Compare an SHS with a solid storage material and an LHS with a PCM storage material. The thermal…
A: Given, Thermal capacity of energy storage system:-Q=600KWhQ=600×3600Q=2160000KJFor SHS,Density of…
Q: A cylinder of known material is 0.02273 m long and has c, = 900 J/kg-K, p = 2700 kg/m², and an…
A:
Q: Determine the ratio of thermal conductivity for N2 at sea level (T = 300 K, P = 1 atm) versus the…
A: To given thaTemperature at sea level, TSea=300k at 1 atm pressureTemperature at sea Stratosphere,…
Q: A 10 cm thick and 1 m wide long steel plate is immersed in an oil bath at T0=40°C when the…
A: Given: L = 10 cm = 0.1 m W = 1 m Ta = 40' C Ti = 240' C h = 600 W/m2 K For steel, ρ = 7833 kg/m3 Cp…
Q: Design a solar chimney to cover 80% of total heating losses in February, where U value for the…
A: Given, Overall heat transfer coefficient, U=0.4w/m2KTotal wall area,A=60m2Average inside…
Q: The top surface of the passenger car of a train moving at a velocity of 115 km/h is 2.8 m wide and 8…
A: To find : The equilibrium temperature of the top surface of the car . Given: The velocity of train…
Q: 2. An 18-cm-long, 16-cm-wide, and 12-cm-high metal block (p = 8000 kg/m', c, = 400 J/kg C, k=200…
A:
Q: Compute the heat to be removed from 110 kg of lean beef if it were to be cooled from 20°C to 4°C,…
A: Given datamass(m)=110 kgInitial Temperature(t)=20°first cooled Temperature (T1)=4°Cfrozen…
Q: The concrete slab of a basement is 11 m long, 8 m wide, and 0.20 m thick. During the winter,…
A: Parte) Write the Fourie heat conduction expression. Now substitute the required value in the above…
Q: Consider 9-cm long rod heated at both ends which follows a 1-D heat equation, With k = 0.82…
A: Given : To find :
Q: Consider a heat engine with a piston chamber that has a diameter of 30 mm, a cold reservoir at 285 K…
A:
Q: An ordinary egg can be approximated as a 5.5-cm-diameter sphere. The egg is initially at a uniform…
A: The diameter of the egg d=5.5 cm Initial temperature of the egg Ti=8°C Temperature of boiling water…
Q: A large home ice cream maker is being used to freeze ice cream. The bowl is at -15C, having just…
A:
Q: A brass wire of 0.8 mm in diameter and 12 m long is annealed in an annealing furnace at a…
A: The solution is given below
Q: A 2-cm-diameter plastic rod has a thermocouple inserted to measure temperature at the center of the…
A: Write the given information.
Q: A steel ball [c=0.46 kJ/kg.°C, k =35 W/m.°C] 5.0 cm in diameter and initially at a uniform…
A:
Q: 4- Carbon steel balls 8 mm in diameter are annealed by heating them first to 900°C in a furnace and…
A:
Step by step
Solved in 2 steps
- 1.60 Two electric resistance heaters with a 20 cm length and a 2 cm diameter are inserted into a well-insulated 40-L tank of water that is initially at 300 K. If each heater dissipates 500 W, what is the time required for bringing the water temperature in the tank to 340 K? State your assumption for your analysis.3.16 A large, 2.54-cm.-thick copper plate is placed between two air streams. The heat transfer coefficient on one side is and on the other side is . If the temperature of both streams is suddenly changed from 38°C to 93°C, determine how long it takes for the copper plate to reach a temperature of 82°C.In a ball bearing production facility, steel balls (k=50 W/m.K, c=0.460 kJ/kg.K, ρ=7865 kg/m3) that are each of 13,99 mm in diameter are annealed by first heating them to 870 oC and then slowly cooling in air to 125 oC. If the cooling air stream temperature is 60 oC, and it has a convective heat transfer coefficient of 35 W/m2.K), determine the time [s] required for the cooling.
- Consider a heat engine with a piston chamber that has a diameter of 30 mm, a cold reservoir at 285 K and hot reservoir at 350 K. It is also equipped with a metal can cylinder that has a volume of 0.0002 m3. How many moles of air are present in the system if the metal cylinder is in the cold tank and the measured pressure and the total air volume are 104160 and 0.00015 m3, respectively?A cylindrical body having 10 cm diameter and lenth of 30 cm passes through a heat treatment furnace which is 6 m in length. The body must reach a temperature of 800°C before it comes out of the furnace. The furnace gas is at 1250°C and body initial temperature is 90°C. How much time it will take to attain the required temperature ? Take h = 100 W/m² °C. Take K(steel) = 40 W/m°C and a (thermal diffusivity of steel) = 1.16 x 10-5 m²/s.An ordinary egg can be approximated as a 5.5-cm-diameter sphere. The egg is initially at a uniform temperature of 8°C and is dropped into boiling water at 97°C. Taking the properties of the egg to be ρ = 1020 kg/m3 and cp = 3.32 kJ/kg·°C, determine how much heat is transferred to the egg by the time the average temperature of the egg rises to 70°C.
- A small copper wire with a diameter of 0.792 mm and initially at 366.5 K is suddenly immersed in a liquid held constant at 311 K. The convection coefficient h = 85.2 W/m2 · K. The physical properties can be assumed constant and are k = 374 W/m · K, cp = 0.389 kJ/kg · K, and ρ = 8890 kg/m3. Determine the time in seconds for the average temperature of the wire to drop to 338.8 K (one-half the initial temperature difference). Do the same but for h=11.36W/m2·K. Forpart(b),calculate the total amount of heat removed for a wire 1.0 m long.Layers of 6-in-thick meat slabs (k = 0.26 Btu/h·ft·°F and a = 1.4 * 1026 ft2/s) initially at a uniform temperature of 50°F are cooled by refrigerated air at 23°F to a temperature of 36°F at their center in 12 h. Estimate the average heat transfer coefficient during this cooling process. Solve this problem using the Heisler charts.An ice chest is constructed of Styrofoam [k = 0.033 W/m.°C] with inside dimensions of 25 by 40 by 100 cm. The wall thickness is 5.0 cm The outside of the chest is exposed to air at 25°C with N=10 W/m2°C. If the chest is completely filled with ice, calculate the time for the ice to completely melt. State your assumptions. The enthalpy of fusion for water is 330 kJ/kg
- Indirect Cooling With Liquid Nitrogen. You are designing a system to cool an insulated silver plate of dimensions 2.00 cm × 2.00 cm x 0.40 cm. One end of a thermally insulated copper wire (diameter D = 2.70 mm and length L = 12.0 cm) is dipped into a vat of liquid nitrogen (T = 77.2 K), and the other end is attached to the bottom of the silver plate. (a) If the silver plate starts at room temperature (73.0°F), what is the initial rate of heat flow between the plate and the liquid nitrogen reservoir? (b) Assuming the rate of heat flow calculated in part (a), estimate the temperature of the silver plate after 30.0 seconds.Indirect Cooling With Liquid Nitrogen. You are designing a system to cool an insulated silver plate of dimensions 2.00 cm × 2.00 cm × 0.60 cm. One end of a thermally insulated copper wire (diameter D = 2.70 mm and length L = 18.0 cm) is dipped into a vat of liquid nitrogen (T = 77.2 K), and the other end is attached to the bottom of the silver plate.(a) If the silver plate starts at room temperature (65.0 °F), what is the initial rate of heat flow between the plate and the liquid nitrogen reservoir?(b) Assuming the rate of heat flow calculated in part (a), estimate the temperature of the silver plate after 30.0 seconds.In an annealing process, a 50-mm-thick stainless steel plate (ρ = 8238 kg/m3, cp = 468 J/kg⋅K, k = 13.4 W/m⋅K, and α = 3.48×10−6 m2/s) was reheated in a furnace from an initial uniform temperature of 230°C. The ambient temperature inside the furnace is uniform at 1000°C, and the convection heat transfer coefficient is 215 W/m2⋅K. If the entire stainless steel plate is to be heated to at least 620°C, determine the time that the plate should be heated in the furnace using the analytical one-term approximation method. The time that the plate should be heated in the furnace is