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Calculate the specific surface of
(a) tennis balls.
(b) pang pong balls.
(c) ball bearings I mm in diameter, and (J) fly ash with approximately spherical particles of 50 pm in diameter.
A set of four wood members are lashed together at several points along the length with the goal of creating a bar with a larger cross-section that is less susceptible to buckling.
Briefly explain the purpose of the International Space Station, and list the name of all space agencies involved in building and operating it.
How much subsidence would be expected from an elastic confined aquifer that has a specific storage of 2.0*10^-6 (ft^-1), a decline in pressure of 200 (lbs/in^2), and aquifer thickness of 400 ft, and a porosity of 32 percent
From two observation wells 200 m apart, theobserved water table elevations are 11 and 7 m measured form the bottom of the stratum. Determine the discharge per unit width of the aquifer.
A rectangular unfinished concrete channel with wood forms is laid on a bottom slope of 0.0064 to carry a flow of 20m^3/s of water. Determine the width of the channel when the flow is in critical condition.
Estimate the hourly production and unit cost of rock excavation by drilling and basting. The rock is limestone having a seismic velocity of 6000 ft/s.
Determine the required mass of block A so that when it is released from rest it moves the 5-kg block B a distance of .75m up along the smooth inclined plane in t=2s. Neglect the mass of the pulleys and cords.
The fixture AC is designed with a screw adjustment to regulate the height of the 900 N load supported by the roller at A. The screw bears against a smooth surface at B. Determine the reaction forces at points B and C. Neglect the weight of the fix..
A one-dimensional consolidation test gave the following results: Cc = 0.32, Cr = 0.06, and OCR = 6. In the field, the groundwater level is at the ground surface.
A sample of undisturbed soil has a dry weight of 110 lb and volumen of 1 ft^3. If the specific gravity of the soil solids is 2.65, determine the void ratio and the porosity.
The pressure in the steam condenser of a nuclear power plant is 1 psia. Calculate the absolute pressure head, the gage pressure, the gage pressure head, the vacuum pressure, and the vacuum pressure head under standard conditions.
Moisture in the hot drying air condensing on the cooler grain near the plenum of the bin (Hint: The vapor in the ambient will condense out if the temperature of a surface is lower than the incoming air dew-point temperature).
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