A solid cylinder of radius r1 = 2.2 cm, length h1 = 4.7 cm, emissivity 0.82,...
A solid cylinder of radius r1 = 2.2 cm, length h1 = 4.7 cm, emissivity 0.82, and temperature 25°C is suspended in an environment of temperature 55°C. (a) What is the cylinder's net thermal radiation transfer rate P1? (b) If the cylinder is stretched until its radius is r2 = 0.51 cm, its net thermal radiation transfer rate becomes P2. What is the ratio P2/P1?
Homework Answers
Use the equation for net radiation using the area of cylinder,
emissivity and the temperature as shown below. When the cylinder is
stretched its volume remains constant.
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A solid cylinder of radius r1 = 2.2 cm,
length h1 = 4.7 cm, emissivity 0.82,...
A solid cylinder of radius r1 = 2.2 cm, length h1 = 5.9 cm, emissivity 0.91,...
A solid cylinder of radius r1 = 2.2 cm, length h1 = 5.9 cm, emissivity 0.91, and temperature 38°C is suspended in an environment of temperature 70°C. (a) What is the cylinder's net thermal radiation transfer rate P1? (b) If the cylinder is stretched until its radius is r2 = 0.55 cm, its net thermal radiation transfer rate becomes P2. What is the ratio P2/P1?
Chapter 18, Problem 058
A solid cylinder of radius r1 = 3.0 cm, length h1 = 4.6 cm, emissivity 0.73, and temperature 21°C is suspended in an environment of temperature 65°C. (a) What is the cylinder's net thermal radiation transfer rate P1? (b) If the cylinder is stretched until its radius is r2 = 0.43 cm, its net thermal radiation transfer rate becomes P2. What is the ratio P2/P1?
A sphere of radius 0.500 m, temperature 25.5°C, and emissivity 0.819 is isolated in an environment...
A sphere of radius 0.500 m, temperature 25.5°C, and emissivity 0.819 is isolated in an environment of temperature 77.0°C. (a) At what rate does the sphere emit thermal radiation? (b) At what rate does the sphere absorb thermal radiation? (c) What is the sphere's net rate of energy exchange?
+-/1 points My Notes 6. A sphere of radius 0.500 m, temperature 27.3°C, and emissivity 0.873...
+-/1 points My Notes 6. A sphere of radius 0.500 m, temperature 27.3°C, and emissivity 0.873 is isolated in an environment of temperature 77.0°C. (a) At what rate does the sphere emit thermal radiation? (b) At what rate does the sphere absorb thermal radiation? W (c) What is the sphere's net rate of energy exchange?
4. Mixed-Mode Heat Transfer - A transistor capsule is roughly spherical with a 1 cm diameter,...
4. Mixed-Mode Heat Transfer - A transistor capsule is roughly spherical with a 1 cm diameter, covered by a very thin dielectric coating with radiation emissivity E 0.85 The transistor surface is at 60 °C and the surrounding air is at 30°C. The transistor is contained by the black walls of a spherical case with temperature 35 °C, where the case walls are located at a distance H 10 cm from the transistor capsule wall. a) Find the rate of...
2. An aluminum cylinder has a radius (ra) of 3 cm and al n cylinder has...
2. An aluminum cylinder has a radius (ra) of 3 cm and al n cylinder has a radius (11) of 3 cm and a length (L) of 10 cm. The cylinder is covered with an additional insulation laver which has the critical insulation thickness The insulation surface is exposed to ambient air with the convection heat trans coefficient of h = 5 W/m2.°C. The surface temperature (T1) of aluminum cylinder is 100 The ambient air temperature (T..) is 25 °C....
1. A solid cylinder has a mass of 5 kg and a radius of 30 cm. A torque of 40 Nm is applied to the cylinder. What will be...
1. A solid cylinder has a mass of 5 kg and a radius of 30 cm. A torque of 40 Nm is applied to the cylinder. What will be its angular acceleration? a) 37.5 rad/s2 b) 59.3 rad/s2 c) 89.0 rad/s2 d) 178 rad/s2 2. When an object is in static equilibrium a) the net force on it is zero b) the net torque on it is zero c) the net force and net torque are zero d) not enough...
A long, conductive cylinder of radius R1 = 3.00 cm and uniform charge per unit length λ = 604 pC/m is coaxial with a long, cylindrical, non-conducting shell of inner and outer radii R2 = 10.5 cm and R3 = 12.0 cm, respectively
A long, conductive cylinder of radius R1 = 3.00 cm and uniform charge per unit length λ = 604 pC/m is coaxial with a long, cylindrical, non-conducting shell of inner and outer radii R2 = 10.5 cm and R3 = 12.0 cm, respectively. If the cylindrical shell carries a uniform charge density of p = 79.8 pC/m, find the magnitude of the electric field at the following radial distances from the central axis:
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C and 100°C, respectively. Determine the rate of heal transfer by radiation between the plates in Wim and the radiative heat transfer coefficient in W/m K ) 12 Write down the one-dimensional sent heal conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents 13 Write down the one-dimensional transient heat conduction...
Please Show alll work. 1.A person’s blood pressure is 120/70 (measured in mmHg). What must the...
Please Show alll work. 1.A person’s blood pressure is 120/70 (measured in mmHg). What must the height of an IV bag be so that blood is not pushed into the IV line by the blood pressure? 2. A graduate student doing an experiment puts 0.150 moles of helium into a cylinder with a moveable piston. The helium is at a pressure of 1.0 atm and a temperature of 30 °C at the beginning of the experiment. They then compress the...
A sphere of radius 0.500 m, temperature 25.5°C, and emissivity 0.819 is isolated in an environment of temperature 77.0°C. (a) At what rate does the sphere emit thermal radiation? (b) At what rate does the sphere absorb thermal radiation? (c) What is the sphere's net rate of energy exchange?
+-/1 points My Notes 6. A sphere of radius 0.500 m, temperature 27.3°C, and emissivity 0.873 is isolated in an environment of temperature 77.0°C. (a) At what rate does the sphere emit thermal radiation? (b) At what rate does the sphere absorb thermal radiation? W (c) What is the sphere's net rate of energy exchange?
4. Mixed-Mode Heat Transfer - A transistor capsule is roughly spherical with a 1 cm diameter, covered by a very thin dielectric coating with radiation emissivity E 0.85 The transistor surface is at 60 °C and the surrounding air is at 30°C. The transistor is contained by the black walls of a spherical case with temperature 35 °C, where the case walls are located at a distance H 10 cm from the transistor capsule wall. a) Find the rate of...
2. An aluminum cylinder has a radius (ra) of 3 cm and al n cylinder has a radius (11) of 3 cm and a length (L) of 10 cm. The cylinder is covered with an additional insulation laver which has the critical insulation thickness The insulation surface is exposed to ambient air with the convection heat trans coefficient of h = 5 W/m2.°C. The surface temperature (T1) of aluminum cylinder is 100 The ambient air temperature (T..) is 25 °C....
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C and 100°C, respectively. Determine the rate of heal transfer by radiation between the plates in Wim and the radiative heat transfer coefficient in W/m K ) 12 Write down the one-dimensional sent heal conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents 13 Write down the one-dimensional transient heat conduction...
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