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Laboratory clean rooms are often kept at a slightly higher pressure than ambient pressure in order to flush out particulates and keep dust from getting in. If the pressure in such a room is equivalent to 1 mm water greater than the surrounding rooms, with what velocity will air exit under a small crack in the door? Assume that viscous effects are negligible, i.e., that no energy is lost in the flow
You are planning a Polaris observation at latitude 42 degrees North when the star is at or near upper culmination. You want to know the error in azimuth that will result from a 1 min timing error. You know that the meridian angle, t, is exactly 0 deg..
a simple beam with a pin support at A on the left side of my beam, and a roller connection 20 feet away on the far right side of the beam labeled C, with the midspan point (10 feet) labeled B.
A diving board of uniform cross-section is designed to deflect 6" under the weight of a 150 pound person standing on the end. With the recent trend towards obesity
A BOD5 test sample of river water has the following test data. DO on day 0 = 7.9 mg/L. DO on day 5 = 2.3 mg/L. What is the BOD5 of the river water
What is the magnitude of the maximum stress that exists at the tip of an internal crack having a radius of curvature of 5.5× 10-4 mm (2.165 ×10-5 in.) and a crack length of 3.5 ×10-2 mm (1.378 × 10-3in.)
A 4 mgd water treatment planet is being designed for an overflow rate of 0.5 gpm/ft^2. If two circular sedimentation basins will be used at al times, what should be the diameter of each basin
Block one has a mass of 1.5kg. Block two has a mass of 3.0kg. Treatthe pulleys as hoops. The radius of pulley one is 8.70m. The massof pulley one is 4.5kg.
The difference between the total and static pressure before a shock is 75 psi. What is the maximum static pressure that can exist at this point ahead of the shock? The gas is oxygen.
1 discuss the different agencies institutes centers and other national bodies that are involved in environmental work
A canal of rectangular cross-section and an n=0.030 is to be laid on a slope of 0.002 and is to carry a discharge of 30 m3/s. Calculate the cross-sectional area required for the channel to carry this flow based on the norma
Determine the rate of ammonia (NH4-N) utilization and the biomass growth rate for the following conditions:
A spillway carries a discharge of 22.5 m^3/s with the outlet velocity of 15 m/s at a depth of .2 m. Select an adequate USBR stilling basin and determine the sequent depth, the length of the hydraulic jump and the energy loss.
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