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A system consists of a gas confined between a cylinder and piston such that work and heat may cross the boundary. What type of system is that? What type of system is a free body as used in mechanics or civil engineering? What type of system would you classify an electric wire with current passing through it?
Suppose you are a member of an EPA enforcement team investigating the possible dumping of arsenic into Arbor Lake. You take water samples from the middle of the lake and find that the concentration is 90.0 ppb.
A concrete mix with a 3in slump, w/c ratio of .5, and sand with a fineness modulus of 2.4 contains 1700lb/yd3 of coarse aggregate. Compute the required weight of coarse aggregate per cubic yard
An object is thrown downward from a 150-ft cliff with a velocity of 45m/hr so that it makes an angle of 60° with vertical face of the cliff.
A river upstream of a brdige corssing is 3 meters deep and has an average velocity of 3 m/s. The bridge piers cause a constriction in the width of the flow by 12%.
You have determined that a 0.5 ppm concentration of copper sulfate should be applied to a lake to control the growth. The lake volume is 50 ac-ft. How many pounds of copper sulfate should be dissolved in the lake
You are a Project Manager on site where work for 3K.m. long Tunnel has been undertaken. The site is remote and takes about 2 days travel to nearest town. Supervisors, Technicians & Skilled Workers are engaged in dangerous / hazardous work.
Water at a pressure of 13 atm, at street level, flows into a building at 3m/s through a 6 cm diameter pipe. The pipe tapers down to a 2 cm diameter by the top floor 50 m above.
A rectangular concrete channel 10 m wide has a bed slope of 1 m/km and surface roughness equivalent to a Manning n of 0.02. It is proposed to use a hump on the channel bed for the purpose of flow measurement. If the maximum discharge is 150 m3/s:
50 kmol per hour of air is compressed from p1 = 1.2 bar to P2 = 6.0 bar in a steady-flow compressor. Delivered mechanical power is 98.8KW. Temperature and velocities are: T1= 300K T2= 520K u1= 10m s^-1 u2= 3.5m s^-1
if 25 acres of land recieved 3.5 inches of water from the irrigation district, determine volume of water on the land in acre-ft
In Chlorine disinfection (3-log reduction in Giardia- Cysts), determine the water pH for a contact time of 90 minutes using a chlorine concentration of 2 mg/L at 20 degrees C
The span length is 32 feet. Total deflection is not to exceed span/240. Select the lightest (economical) steel wide flange section (W shape) with a yield stress of 50 ksi. Assume the beam weight to be 200 PLF
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