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1.The mean score of students on an aptitude test is 72 points with a standard deviation of 8 points. What is the probability that two groups of students, consisting of 28 and 36 students respectively, will differ in their mean scores by
(a) 3 or more points (b) 6 or more points?
2.The compressor of a refrigerator compressed saturated R-134a vapor at 5 F to 200 pisa. How much work (ft-lbf/lbm) does this require when the process is isentropic
a simply supported beam with a span of 8m is to carry, in addition to its weight, a superimposed dead load of 18kN/m and a live load of 30kN/m both over the entire span.
A 1:2000 scale tidal model is operated to satisfy Froude's law. A velocity of 0.02 ft/s is observed in the model. What is the velocity at the corresponding point in the prototype
To remove a nail, a small block of wood is placed under a crowbar, and a horizontal force P is applied as shown. Knowing that the maximum vertical force needed to extract the nail is 2600 N and that the horizontal force P is not to exceed 290 N, d..
Vehicles A and B are traveling toward each other in the opposing lanes on a straight segment of a two-lane highway at 35 and 40 mph respectively. If the critical rates of angular change of the two drivers are 0.0065 and 0.0055 rad/s, determine
The given data show the result of a model known as stopping sight distance, used by civil engineers to design roadways speed(mph) stopping sight distance(ft)
Are either of the Ax or Jx forces relevant to finding the tension between H and J? If so, what is the easiest way to solve for those 2 unknowns?
A rigid tank contains 40 lbm of air in 20 psia and 70 degrees F. More air is added to the tank untill the pressure and temperature rise to 35 psia and 90 degrees F, respectively.
A river is 2 m deep. The river bed consists of a depth of sand of saturated unit weight 20 kN/m^3. What is the effective vertical stress 5 m below the top of the sand
How many gallons would be required to last the same time as the gas? The sodium hypochlorite solution strength is 15 percent by weight and has the same unit weight as water (specific gravity 1.0). One pound of sodium hypochlorite has the same disinfe..
A company near City X want's to know how much benzene they can release into River Y. City Z is 85.5 miles downstream from City X. City Z doesn't want to have Benzene levels higher than 0.0000015 g/L.
what is the rate of evapouration of water from a reservoir with air temp at 20c and the surface of reservoir is 3000m2.
Two pounds of an ideal gas are contained within a piston-cylinder arrangement. The initial volume and pressure are 1 ft3 and 75 psia respectively. The final volume is 3 ft3.
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