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an air space above a long tube is pressurized to 50 kPa vacuum. water (20 degrees C) from a reservoir fills the tube to a height h. If the pressure in the air space is changed to 25kPa vacuum, will h increase or decrease and by how much? Assume atmospheric pressure is 100kPa.
The first alternative is deep-well pumping at an annual cost of $10500. The second alternative is to instal an 18 inch diameter pipeline from a local surface reservoir at a first cost of $25000 and an annual pumping cost of $7000.
a car is traveling at sea level at 78 mi/h on a 4% upgrade before the driver sees a fallen tree in the roadway 150 feet away. the coefficient of road adhesion is 0.8. The car weighs 2700 lbs, has a drag coefficiant of 0.35, a frontal area of 18 ft..
A horizontal pre-stressing force of 500kN is applied to rectangler beam. the beam has a depth of 500mm and a width of 250mm. the force is applied at a distance of 80mm below the x-x axis.
The defender had a first cost of $300,000, but its market value now is only $100,000. It has chargeable expenses of $120,000 per year and no expected salvage value. To simplify calculations, assume that SL depreciation was charged at $60,000 per y..
A balloon is being inflated at the rate of 15m^3/min. At what rate is the diameter increasing after 5 min? Assume that the diameter is zero at time zero.
A beam is 11.5m long. There are two lifting points at 2.2m from each end of the beam. Beam self weight = 4kNm superimposed live load = 12kNm. How to determine what the bending moments are at the lifting points
A 1045 steel will be heat treated in air at 900 C. What is the carbon concentration at 0.4 mm below the surface after 6 hours
A rectangular channel carries a flow of 10 cfs/ft of width. Plot a curve of specific energy vs depth. Compute the minimum value of specific energy and the critical depth. What are the alternative depths for Es = 5.0
A liquid of 80 mole percent propane and 20 mole percent n-pentane is to be diluted with methane. Will all mixtures of the liquid and methane be single phase at 160 F and 500 psia
What is the pH value of water containing 0.005 M of an acid with a acid dissociation constant of 0.001 M. The dissociation of the acid in water can be represented as: HA H+ + A-
one of the wells pumps at a rate of 1240 m3/day. the second well pumps at 850 m3/day.if the aquifer has a transmissivity of 2000 m2/day and a storage coefficient of 4x10^-4, when would the wells start interfering with each other.
The 30-Mg freight car A and 15-Mg freight car B are moving toward each other with the velocities VA= 20 km/h to the right and VB= 10 km/h to the left. the spring constant on car A is k= 3MN/m.
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