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A rubber ball contains saturated sand, and water reaching into the neck of the glass tube inserted into the ball, above the sand. When squeezing the ball between two fingers, the water level appears to go down. This phenomenon, which is often used in geotechnical laboratories to demonstrate the special properties of soils, can be explained by assuming that the initial density of the sand is very high (if this not the case the sand may be densified before the demonstration by knocking the ball several times onto the table, preferably before the arrival of the spectators). The squeezing of the sand results in a shear deformation, and in this dilatant material this is accompanied by a volume expansion of the assembly of granular particles. This means that the pore volume increases, and thus water is drawn into the ball from the glass tube.
Air at 20C flows over a very large bank of 2 cm OD tubes that are kept at 100C. the air approaces at an angle of 15 degress off normal to the tubes. the tube array is staggered, with SL= 3.5 CM and ST= 2.8 cm. Find Average h on the first tubes and on..
Why is it often difficult to evaluate the elastic limit. What is the effect of poor alignment of the specimen. Why does a specimen that is properly aligned provide a more accurate estimate of the tensile strength compared to the estimate provided f..
consider the case of a knife whose leading edge is the z-axis and the blade covers the half plane defined by x 0.
carbon monoxide and water vapor react in stoichiometric amounts to form carbon dioxide and hydrogen.the feed enters at
For the position shown in the figure, determine the orientation of the neutral axis and calculate the maximum tensile stress σt and maximum compressive stress σc in the beam. Assume that θ= 30° and M = 30 k-in.
imagine that the heart acts as a pump. blood enters the heart from the lungs at 6mm hg and leaves to the rest of the
water is the working fluid in an ideal regenerative rankine cycle with one open feedwaer heater. superheated vapor
consider x norm57 y norm57 and z norm19 and assume xy and z are independent.1 find and sketch the probability
For a laminar flow between two parallel plates shown figure below, obtain an expression for the pressure drop and velocity profile. Also, obtain an expression for Frictional dissipation and the friction factor.
air at 68 degrees f and 1atm. flows over a flat plate at 114.8 fts. the plate is 29.5 in long and 12 in wide. the plate
Determine the balanced reaction equation. For the CO and SO2, determine the amount, in kmol per 106 kmol of combustion products (that is, the amount in parts per million).
The atomic radii of a divalent cation and a monovalent anion are 0.77 nm and 0.136 nm, respectively. Calculate the force of attraction between these two ions at their equilibrium interionic separation.
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