Question

In: Mechanical Engineering

A 1-m-diameter cylinder, 1 m long, is maintained at 800 K and has an emissivity of...

A 1-m-diameter cylinder, 1 m long, is maintained at 800 K and has an emissivity of 0.65. Another cylinder, 2 m in diameter and 1 m long, encloses the first cylinder and is perfectly insulated. Both cylinders are placed in a large room maintained at 300 K. Calculate the heat lost by the inner cylinder.

Solutions

Expert Solution


Related Solutions

A 4.00-m-long cylinder of solid aluminum has a radius of 2.00 cm. 1) If the cylinder...
A 4.00-m-long cylinder of solid aluminum has a radius of 2.00 cm. 1) If the cylinder is initially at a temperature of 4.00∘∘C, how much will the length change when the temperature rises to 30.0°C? 2)Due to the temperature increase, by how much (in %) would the density of the aluminum cylinder decrease? 3)By what percentage does the volume of the cylinder increase?
A vertical cylinder 76.2mm in diameter and 121.9mm high is maintained at 397.1K at its surface....
A vertical cylinder 76.2mm in diameter and 121.9mm high is maintained at 397.1K at its surface. It loses heat by natural convection to air at 294.3K. Heat is lost from the cylindrical side and the flat circular end at the top. Calculate the heat loss, neglecting radiation losses. Use the simplified equations of Table 1.5-2 and those equations for the lowest range of GrPr. The equivalent L use the top flat surface is 0.9 times the diameter
A uniform brass solid cylinder has a mass, m = 500 g, and a diameter, D...
A uniform brass solid cylinder has a mass, m = 500 g, and a diameter, D = 6 cm and a length L = 1 m. The cylinder rotates about its axis of rotational symmetry at an angular velocity of 60 radians/s on a frictionless bearing. (a) What is the angular momentum of the cylinder? (b) How much work was required to increase the angular momentum of the cylinder to this value if the cylinder was initially at rest? Once...
Two infinitely long plates with surface temperatures maintained at 600 K and 300 K respectively are...
Two infinitely long plates with surface temperatures maintained at 600 K and 300 K respectively are placed parallel to each other. Two infinitely long radiation shields are placed in the evacuated space between these plates. All the surfaces mentioned above are gray and diffuse and have an emissivity of 0.85. Determine the steady state temperatures of the radiation shields.
A cylinder 100 mm in diameter and 80 mm long with an initial temperature of 527...
A cylinder 100 mm in diameter and 80 mm long with an initial temperature of 527 C is suddenly exposed to water at 27 C giving a convective heat transfer coefficient of 400 W/m2-K. Determine the temperature at the center of the cylinder after 10 minutes. Assume density is 8050 kg/m3, specific heat is 536 kJ/kg-K, and thermal conductivity is 18.6 W/m-K. **** Not lumped Capacitance Problem. ****
A hot dog can be considered to be a 12 centimeter long cylinder, whose diameter is...
A hot dog can be considered to be a 12 centimeter long cylinder, whose diameter is 2 cm and whose properties are ? = 980 kg/m3 , cp = 3.9 kJ/kg · K, k = 1.2 W/m · K, and ? = 2 × 10?7 m2 /s. A hot dog initially at 5?C is dropped into boiling water at 100?C. The heat transfer coefficient at the surface of the hot dog is estimated to be 600 W/m2 · K and...
An object of irregular shape has a characteristic length of 1 m and is maintained at...
An object of irregular shape has a characteristic length of 1 m and is maintained at a uniform surface temperature of 450 K. When placed in atmospheric air at a temperature of T? 300 K and moving with a velocity of 100 m/s, the average heat flux from the surface to the air is 20,000 W/m2. If a second object of the same shape, but with a characteristic length of 5 m, is maintained at a surface temperature of 450...
The cable lifting an elevator is wrapped around a 1.2-m-diameter cylinder that is turned by the...
The cable lifting an elevator is wrapped around a 1.2-m-diameter cylinder that is turned by the elevator's motor. The elevator is moving upward at a speed of 1.3 m/s . It then slows to a stop, while the cylinder turns one complete revolution. How long does it take for the elevator to stop?
Thermodynamics An insulated piston/cylinder device contains ideal CO2 gas at 800 kPa, 300 K, which is...
Thermodynamics An insulated piston/cylinder device contains ideal CO2 gas at 800 kPa, 300 K, which is then compressed to 6 MPa in a reversible adiabatic process. Determine the final temperature and the specific work during the compression process using: (a) Ideal gas tables A.8, (b) Constant specific heats A.5.
A long solenoid (1500 turns/m) carries a current of 20 mA and has an inside diameter...
A long solenoid (1500 turns/m) carries a current of 20 mA and has an inside diameter of 4.0 cm.  A long wire carries a current of 2.0 A along the axis of the solenoid.  What is the magnitude of the magnetic field at a point that is inside the solenoid and 1.0 cm from the wire? a. 78 µ b.   55 µT c.    48 µT d.   68 µT e.   2.0 µT
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT