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A NCSU student turned on his/her 150 W fan inside his/her room, 4m * 6m * 6m, before going to class in the morning of a summer day, excepting to find his/her room cooler when he/she returns at night. Assume all doors and windows are perfectly closed and suppose the room insulation is in optimal conditions (outragenously unreasonable). so that there is no heat transfer from the surroundings. determine the room temperature when the student comes back. 10 h after leaving in the morning. Assume that the total mass of air in the room is 173kg, for which CV= 0.718kj kg^-1 k^-1. The room temperature in the orning was 15 C
a storage tank has a diameter of 80 ft, a height of 25ft and contains oil to a height of 15ft. the suction pumps, which can handle 15000bbl/d, are started, but the safety valves are clogged and a vacuum is drawn in the tank.
Determine the force members BC, FC, and FE, and state if the members are in tension or compression.
If a watershed of drainage area 100 mi^2 has abstractions of 2.5 in/hr, what runoff volume will show up in the nearby stream in addition to baseflow for a rainfall of 5-hr duration with an intensity of 4 in/hr
Two reservoirs are connected with a 30" diameter pipe with a length of 19,680 ft. The water surface elevation in the upper reservoir of the upper reservoir is 984 ft, lower reservoir 886 ft and the elevation at the midpoint is 918 ft.
What is the expected boiling-point elevation of water for a solution that contains 271 g of sodium chloride dissolved in 1.0 kg of water?
The search light is rotating at a constant rate of 4 rad per second. Find the magnitude of the velocity and acceleration of the spot of light on the wall when the search light beam makes a 45 degree angle with the wall.
Determine the maximum allowable misclose for this engineering survey using the formula based on the munber of instriunent stations used in the work.
a stream f gas flowing at 3000 cfm has a particulate loading of 50gr/ft what is the allowable exit loading if 95 % collection efficiency is required. what is the mass of the particles collected
Assuming D/D/1 queuing, what will be the total vehicle delay?
Q. Briefly explain the purpose of the International Space Station, and list the name of all space agencies involved in building and operating it. When is the assembly of the station expected to be completed? Include the name and the expected date ..
A company that manufactures regenerative thermal oxidizers made an investment 10 years ago that is now worth $1,300,000. How much was the initial investment at an interest rate of 15% per year (a) simple interest and (b) compound interest?
An aluminum alloy tube with an outside diameter of 2.9 in. and a wall thickness of 0.32 in. is used as a 19-ft-long column. Assume that E = 8300 ksi and that pinned connections are used at each end of the column.
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