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Problem: The soil profile acting against the back of a retaining concrete wall is shown in the Fig. below. The ground surface behind the wall slops at an angle β=10° to the horizontal and carries a uniformly distributed load of 45 kPa. Assuming that Rankine's conditions apply:
Assume that the unit weight of the concrete is 24.5 kN/m3 and the design bearing resistance of the soil beneath the wall has been calculated to be 320 kPa. Ignore any passive resistance from the soil in front of the wall. Check the safety of the proposed design against by the traditional (gross pressure) method (assume coefficient of friction between base of wall and soil is equal to tan 35°)
Read the case study from chapter four on Harrison elementary school
You wish to design the rung on a ladder. The ladder should be light in weight so that it can be easily transported and used. The rungs on the ladder should be 0.25 in. x 1 in. and are 12-in. long. Design a material and its processing for the rungs..
The result for Problem 9.12 predicts that the average velocity for turbulent flow will be found at a distance of 0.216r 0 from the wall of the pipe. Compute this distance for a 24-in Schedule 40 steel pipe. Then, if the pipe carries water at 50°F ..
the thermal conductivity parallel to continuous reinforcing fibers in a composite with e-glass in a matrix of polyester
Genetically engineered bacteria (used to produce insulin) are immobilized in a solid agar disc (cylinder with flat surface facing up - 100 cm diameter, 5 cm height), which is exposed to large volume of stirred liquid media on both of the flat surface..
For air at a temperature and cross flow velocity of Too = 25°C, V = 0.1 m/s, respectively, determine the surface temperature of the tube. The surround- ings temperature is Tsur = 25°C. For the conditions of part (a), plot the tube surface temperature..
The bulk modulus of elasticity for water is 2.205 GPa. Determine the change in pressure required to reduce a given volume by 0.75%.
a 40 cm diameter pipe at 75 degree c is buried in a large block of portland cement. it runs parallel with a 15 degree c
Describe how you would set up the blood glucose control problem as a linear quadratic regulator problem. Determine the appropriate Q and R matrices that you would use and write down an appropriate cost function J that can be optimized
Determine the maximum permissible value of the load q if the allowable bending stress in the shelf is σallow= 7.5 MPa and the position of the supports is adjusted for maximum load carrying capacity.
Remember that velocity is a vector quantity so find the magnitude of the average velocity and the angle of average velocity from the horizon
A leadscrew coupled directly to a dc servomotor is used to drive one of the table axes of an NC milling machine. The leadscrew has 5 threads/in.
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