The nose section of the rocket is made up of a 6 mm thick stainless steel plate (p = 7800 kg/m°, c = 460 J/kg°C, k = 55 W/m°C). It is held initially at a uniform temperature of " T = 47°C. When the rocket enters the denser layers of the atmosphere at a very high velocity the effective temperature of the air surrounding the nose region attains the value 2150 °C; the surface convective heat transfer coefficient is estimated as 3395 W/m?°C. If the maximum metal temperature is not to exceed 1100°C, determine: (i) Maximum permissible time in these surroundings. (i) Inside surface temperature under these conditions.

Q: The air in the evaporator section of a refrigerator will be cooled by passing it over a bundle of…

A: The question likely asks for the flow rate (Q) of the fluid through the siphon.Here's a general…

Q: The jet plane is flying upward such that its wings make an angle of attack of 15⁰ with the…

A:

Q: Engine oil at 20°C is forced over a 20-cm-square plate at a velocity of 1.2 m/s. The plate is heated…

A: oil temperature, to=200Cplate temeperature. tp=400Cvelocity, v=1.2 m/sto find heat lost by the plate…

Q: An air at state point 1 (50°C dry bulb temperature and 25°C wet bulb temperatu experiences a…

A: Evaporating Cooling

Q: A pipeline transporting crude oil runs 600 miles between two cities at sea level. The pipeline will…

A: Given:Total length of the pipeline, L=600 miles=600*5280 ft=3.168*106 ft        1 mile=5280 ftOil…

Q: A solid ball is dropped into a water container for cooling. The ball has a diameter of D = 4 mm and…

A: Write the given value for the solid ball using suitable variables. Here D signifies ball diameter,…

Q: During major windstorms, high vehicles such as RVs and semis may be thrown off the road and boxcars…

A: Draw the free body diagram.

Q: The wall of a furnace has an inner temperature of 500 F. The wall has a thickness of 2 inches and…

A:

Q: In a glass production process, a glass plate of 0.5 m x 2 m and 3 mm thickness is cooled by air…

A: For glass plate,Area, A=0.5 m×2 mThickness, t=3 mmFor air,Velocity of air, v=1 m/sKinematic…

Q: A horizontal wind turbine has been installed near the sea shore. (a) Estimate the mechanical power…

A: Horizontal wind turbine installed near seashoreMorning temperature = 20°C -> Air density = 1.204…

Q: The average convection heat transfer coefficient during this cooling process is ____ W/m2·°C

A: Given DataThe steel ballDensity ρ = 8055 kg/m3Specific heat cp = 480 J/kg·KThe diameter  D =0.15…

Q: A 12500 N car is driven at sea level on a level paved surface. The car has CD=0.78and 1.99 m^2…

A:

Q: Two horizontal slabs measuring 0.8 x 1 m form the top of one of the slabs. The gap between them is…

A:

Q: 2. Exhaust gases at 1 atm and 300°C are used to preheat water in an industrial facility by passing…

A:

Q: Engine oil at a temperature of 4 oC is pushed over a 20 cm square plate at a speed of 1.2 m / s. The…

A: Given       Temperature, T1 = 4oC                               T2 = 60oC

Q: A 4-m x 4-m flat plate maintained at a constant temperature of 80°C is subjected to parallel flow of…

A:

Q: The temperature at the walls of the solid body T(x=0) = T(y=0) = T(z=0) = 100°C. The length of the…

A: Warm conductivity alludes to the capacity of a given material to lead/move heat. It is by and large…

Q: An automotive engine can be approximated as a 0.4-m-high, 0.60-m-wide, and 0.7-m-long rectangular…

A: Given data: *The height of the automotive engine is h=0.4 m. *The width of the automotive engine is…

Q: Use the following air properties to solve the problem: p = 1.2kg/m³, μ = 1.8 10-5kg/ms, C₂ = 1007…

A: Given: Air Properties Air temperature T∞=20oC Average speed V∞=1m/s Heat flux q˙s=200 W/m2 To…

Q: Hot air at atmospheric pressure and 85°C enters a 10-m-long uninsulated square duct of cross section…

A:

Q: A 1.2-in-outer-diameter pipe is to span across a river at a 115-ft-wide section while being…

A: Given: The outer diameter of the pipe is D=1.2 in. The width of the river is W=115 ft. The average…

Q: A horizontal oil sump with a surface temperature of 40°C, 0.5 m long and 0.4 m wide containing oil…

A:

Q: A 13 FT X 16 FT flat plate is suspended in a room and subjected to airflow parallel to its surfaces…

A:

Q: An industrial gas at a pressure of 3.5 atm and 27°C blows over a 50-cm x 50-cm plate at an average…

A: Given Data The pressure of the gas, P=3.5 atm The temperature of the gas, T=27°C Constant wall…

Q: The flow velocity of air over a flat plate of dimension 1160 ×610 ×25 mm at 30 OC is 3.2 m/s. The…

A: Given Plate dimension = 1160 mm X 610 mm X 25 mm Temperature = 30o C Velocity = 3.2 m/s Top surface…

Q: Weather balloons are high-altitude balloons that are capable of reaching an altitude of 40 km (or 25…

A: Given:- H=40 km T1 = 304K P=0.028 atm T2=190 k To find:- Diameter of ballon at liftoff, d

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…

A:

Q: Water at 15°C is to be heated to 65°C by passing it over a bank of resistance heating rods 4 m long…

A:

Q: Water at a temperature of 10°C flows at a velocity of 3 m/s across a plate maintained at a uniform…

A: Solution is given below.

Q: Consider two cases involving parallel flow of dry air at V = 4.5 m/s, T = 45°C, and atmospheric…

A:

Q: The components of an electronic system are located in a 1.8-m-long horizontal duct whose cross…

A: Given:- k=0.02717W/m.k Ts=65Tf=30 To find:- Total power rating of the electronic devices that can be…

Q: In which medium does a sound wave travel faster: in air at 20°C and 1 atm or in air at 20°C and 5…

A: The speed of the sound is calculated by using the expression written below: C=γ·R·TM Here, γ is the…

Q: Q5/Air is to be heated by passing it over a bank of 3-m-long tubes inside which steam is condensing…

A:

Q: It is proposed to meet the water needs of a recreational vehicle (RV) by installing a 3-m-long,…

A:

Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.