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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.
consider the following state of stress mpa sigmasigmax 82 sigmasigmay 16 sigmasigmaz 40 tautaoxy 15 tautaoyz
The position-time graph below represents his motion. Use the graph to answer the next several questions.
A 17-tooth 20 normal pressure-angle helical pinion with a right-hand helix angle of 30 rotates at 1800 rev/min when transmitting 4 hp to a 52-tooth helical gear. The normal diametrical pitch is 10 teeth/in, the face width is 1.5 in, and the set has a..
steam at 300 degc travels through a pipe covered with two layers of insulation. the first layer of insulation is 3 cm
one-fourth kg of a gas contained within a piston-cylinder assembly undergoes a constant pressure process at 5 bar. the
stainless stell ball bearings desity 8085 kgm3 and cp 0.480 kjkgc having a diameter of 1.2 cm are to be quenched in
the room temperature yield strength of ni is 100mpa 15000 psi and furthermore sy diminishes about 5mpa for every 50
A pitot static tube on an airplane is flying at standard sea level reads 1.04x10^5 M/m^2. Calculate the velocity of the airplane.
the atomic bomb dropped on nagasaki in 1945 used 14lbm of plutonium pu that was in a subcritical state meaning it would
the fastest that anyone has gotten to the top of a local mountain elevation change of 4479 ft is 32 minutes. assume a
An accelerometer is being designed to measure up to 6664 Hz while remaining under 1.7% error. If the natural frequency of the accelerometer is 9613 Hz, determine the damping ratio that will provide 1.7% error.
Design a rectangular reinforced concrete beam to resist a total design moment Mu of 765 ft.-kips (this includes the moment due to the weight of the beam).
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