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A 30-L electrical radiator containing heating oil is placed in a 50-m3 room. Both the room and the oil in the radiator are initially at 10°C. The radiator with a rating of 1.8 kW is now turned on. At the same time, heat is lost from the room at an average rate of 0.35kJ/s. After some time, the average temperature is measured to be 20°C for the air in the room, and 50°C for the oil in the radiator. Taking the density and the specific heat of the oil to be 950 kg/m3 and 2.2 kJ/kg °C, respectively, determine how long the heater is kept on. Assume the room is well-sealed so that there are no air leaks.
A submerged stratum of clay has a thickness of 15m. The average water content of samples taken from the stratum is 54%, and the specific gravity of the solid constituents is 2.78.
2 kilomoles of diatomic oxygen gas are enclosed in a 10-kg steel container. A force of 2kN now accelerates this system. What is the acceleration
Fluids (water, air etc) are known as 'incompressible'. which of these would you consider to be inappropriate?
The selection of the most appropriate procurement route is important to the successful implementation of a construction project. a) Name and briefly explain the main procurement methods used in the construction industry.
Batteries in a flashlight must be held in electrical contact even though the outer plastic housing expands differently than the battery and terminals. This is accomplished by having a compliant spring compressed as the cover is screwed on the flashli..
In the first couple steps you are using the sine function to derive that the interior triange BCG is a right triangle. However, the sine function, by definition, is opposite divided by hypotenuse. You used sine as opposite dividede by adjacent which ..
A bowling ball is cast on the "alley" with a backspin of = 12 while its center has a forward velocity of = 7 Radius= 120 mm Determine the velocity of the contact point in contact with the alley.
Characteristics between Pre-historic and Egyptian architecture and Egyptian and west Asiatic Architecture
design a square individual footing to support a 16 inch square reinforced concrete column. service loads include a dead load of 180 kips and a live load of 140 kips. both column and footing have fc=3000psi and fy=60000 psi.
Calculate the minimum set-back distance required for a national highway of 4 lane divided carriageway having circular curve of radius of 350 m & design speed 100 km/hr.
Liquid flows with a free surface around a bend. The liquid is inviscid and incompressible, and the flow is steady and irrotational. The velocity varied with the radius across the flow as V = 1/r m/s where r is in meters.
Three-ply asphalt felt and gravel roof over 2in of insulation board is supported by 18in deep precast reinforced concrete beams with 3ft wide flanges. If insulation weights 3lb/ft 2 and the asphalt roofing weights 5.5lb/ft2, determine the total dea..
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