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Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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A body whose surface area is 0.65 m2 and the temperature is 175ºC is placed in a large chamber whose walls are at 25ºC. If the emissivity is 0.75, determine the rate of heat transfer by radiation between the body and the surroundings in W. Round to one decimal place.
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- An asphalt playground is heated in the sun all day; by sundown it reaches a temperature of 45degC. If the asphalt has an emissivity of 0.8, what is the heat flux emitted off the asphalt at night?arrow_forwardA 20-çm diameter sphere has a surface temperature of 500 K. The sphere is suspended in 300 K still air. Find the heat transfer from the sphere. Neglect radiation.arrow_forwardConsider a unidirectional composite lamina where the fibers are aligned at 60° from the x-axis as shown in the figure. If the thickness of the composite lamina is small compared to the in- plane dimensions, it is appropriate to assume that a state of plane stress exists in the lamina. The stress components at point a in the x- y coordinate system are shown in the figure. Determine the principal stresses and principal planes at point a, and indicate on a sketch the orientation of the principal planes which respect to the principal material directions. 20 MPа YA 10 MPa 50 MPaarrow_forward
- The 12ft x 14 foot room illustration in figure 1.6a has an exterior wall at a surface temperature of 60°F, a window surface temperature of 40°F (double glazing on a cold day). The two interior wall surfaces are a temperature of 72°F. Determine the MRT sensation of a person standing in the center of the room. (See figure 1.6 below) Round your values to the nearsest hundreth decimal place (0.00). You will need to upload your mathematical work in question 4.arrow_forwardA 3x3m plate at 500 degC is suspended vertically in a very large room. The plate has an emissivity of 0.13, The room is at 25degC. What is the net heat transfer from the plate?arrow_forwardIf the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio ofarrow_forward
- The surface of a 0.5-m diameter space probe dissipates 150 W of heat to the outside. If the probe surface emits 80% of the heat that comes from the electronic equipment inside of it and the probe does not receive radiation from other surfaces, compute for the surface emissive power in : m²°arrow_forwardDetermine the specific heat of a 150.0 gram object that requires 62.0 cal of energy to raise its temperature 12.0 °C.arrow_forwardIt is desired to analyze heat transfer (or thermal load) and miscellaneous loadsfor a light work activity where there are 3 people in aresidential room located in the State of Durango, Santiago Papasquiaro, fordetermine the energy efficiency of the heating system in the heating seasonwinter, consider the interior temperature of the room to be 22 °C, and the coefficients ofindoor and outdoor heat transfer as 10 and 25 W/m2. °C respectively. Theroom has the following characteristics and electrical devices:arrow_forward
- One kilogram of water is contained in a piston-cylinder device at 100 celcius. The piston rests on lower stops such that the volume occupied by the water is 0.835 m3. The cylinder is fitted with an upper set of stops. When the piston rests against the upper stops, the volume enclosed by the piston-cylinder device is 0.841 m3. A pressure of 200 kPa is required to support the piston. Heat is added to the water until the water exists as a saturated vapor. What is the moisture of the saturated mixture when the piston hits the upper stop?arrow_forwardUrgent Pleasearrow_forward1-41 The ducts of an air heating system pass through an un- heated area. As a result of heat losses, the temperature of the air in the duct drops by 3°C. If the mass flow rate of air is 120 kg/min, determine the rate of heat loss from the air to the cold environment.arrow_forward
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