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Chips of width L = 15 mm on a side are mounted to a substrate that is installed in an enclosure whose walls and air are maintained at a temperature of Tsur = 25°C. The chips have an emissivity of s = 0.60 and a maxi- mum allowable temperature of Ts = 85°C. Exposed surface is h = 8 W/m2 · K, and the surface is characterized by an emissivity of ss = 0.9. The solid sili- con powder is at Tsi,i = 298 K, and the solid silicon sheet exits the chamber at Tsi,o = 420 K. Both the surroundings and ambient temperatures are T00 = Tsur = 298 K.
it has been determined that a point in a load-carrying member is subjected to the following stress condition sx 400 mpa
Volumetric Compression Ration and Mean Effective Pressure of a Diesel Engine, A diesel engine has air before compression at 280 K and 85 Kpa. The highest temperature is 2219 K and the highest pressure is 6 MPa.
a sealed piston-cylinder assembly contains 3 lbm of water. the water is initially at p1 40 psia and t1 300degf. the
A 150 pound person is standing in a stationary 200 pound canoe. If the person dives into the water such that his intial velocity is 5 feet/ second at an angle of 30 degrees from the horizontal, determine the velocity of the canoe immediately after th..
A hot brass plate is having its upper surface cooled by impinging jet of air at temperature of 15 [Degree Celsius] and convection heat transfer coefficient of 220 W/(m^2*K). The 10-cm thick brass plate ( p=8530kg.m^3, Cp=380J/(kg*K), k=110 W/(m*K), a..
A tire of a car having a volume of 0.6 m^3 contains air at 280 kPa. Determine the mass of air in kg contained in the tire at 25 degrees Celsius.
steam enters a turbine at 300 deg c and exhausts at 20 kpa. it is estimated that the isentropic efficiency of the
a 10-kg block is attached to spring a and connected to spring b by a cord and pulley. the block is held in the position
Do this by assuming uniaxial tension along [110] and expressing σ 1, σ 2,.. .,τ 12 in terms of σ [110]. Then use the matrix of elastic constants to ?nd e1, e2, . . .,γ 12, and ?nally resolve these strains onto the [110] axis to ?nd e[110].
a double-glazed window consists of two panes of glass each of thickness t 6 mm. the inside room temperature is ti 293
a simple wheatstone bridge as shown in fig. 7.10 is used to determine accurately the value of an unknown resistance r1
a carnot heat pump is to be used for heating house in winter. the house temperature is set at 25degreec. one day the
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