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A company manufactures a brand of light bulbs with a lifetime in month that is normally distribute with a mean=3 and a variance=1. A consumer buys a number of these bulbs with the intention of repla
For a car traveling 35 mph the distance required to brake for a stop is normally distributed with mean of 55 feet and standar deviation of 8 feet. You are traveling 35 mph in a residential area and
a pump is used to send water from one reservoir to another elevated reservoir. The pipe diameter is 0.120 m. The head-loss through the valve and pipe is given by equation hL =Bv12 2g
The shovel's production at a 100% efficiency is estimated to be 300 BCY/h. and efficiency is 0.80. Truck travel time is estimated to be 8.0 minutes, and truck fixed cycle time (excluding loading ) i
The relative roughness ofa pipe is 0.0005, if the blasius equation is applicable for Thecflow Reynolds number above 2700 rather then 3000<Re<10^5 what will be the new exponent of the blasius
The company expects to spend $100,000 per year for labor and $125,000 per year for supplies before a product can be marketed. At an interest rate of 15% per year, what is the total equivalent future
If the systems will reduce insurance claims by $100,000 two years from now, how much should the company be willing to spend now, it is uses an interest rat of 12% per year
if the discharge from a 90 degree V-notch weir fills a 20 L vessel in 54 seconds and produces a stage of 30mm upstream of the weir crest, what would the weir coefficient be
if a source of groundwater gets contaminated with a DNAPL and another one gets contaminated with a LNAPL, which one will be harder to remediate and why
You are in an old spy movie, and have been locked into a small room (volume 1000 ft). You suddenly realize that a poison gas has just started entering the room through a ventilation duct.
A three point bending test is performed on a glss specimen having a rectangular cross section of hight d =6 mm and width b = 12 mm the distance between support points is 45mm.
Apiece of corroded steel plate was found in a submerged ocean vessel. it was estimated that the original area of the plate was 62.5cm 2 and approximately 2.8k had corroded away during the submersion
A thick steel sheet of area 440cm3 is exposed to air near the ocean. After a one-year period it was found to experience a weight loss of 880g due to corrosion. To what rate of corrosion in mm/yr dos
Determine the vertical stress of 4m below the centre of shallow foundation 3 x 3m carrying a uniform pressure of 275 kN/m3. Plot the variation of vertical stress with depth (up to 10m) below the cen
A cutting 9 m deep is to be excavated in saturated clay of unit weight 19 kN/m3. The design shear strength parameters are cu = 30 kN/ m2 and fu = 0. A hard stratum underlies the clay at a depth of 1
A 3-point bending test is performed on a 10 mm diameter rod of Silicon Carbide. The distance between the supports is one foot. If the load at fracture is 10,000N, what is the flexural strength of th
suppose 76% of all commuters ride to work in carpools. if eight workers are randomly selected, find the probability that at least 7 will ride in carpools
Find max pressure at bottom of gate (psi) 2. Total horizontal force on gate 3. moment about the bottom of the gate
An open channel with a trapezoidal configuration with side batters 1V:3H is to be designed to carry 1.0m^3/s with a bedslope of 0.0065. The channel is lined with concrete with manning's n of 0.011.
Consider the rocket on a test stand . The nose of the rocket is fixed. The rocket is of length L, constant EA and constant m, mass per unit length. To investigate longitudinal dynamics, the rocket i
What is the elongation of a rectangular bar (cross section 2 inch * 2 inch length 4 ft) When it is subjected to an axial load of 80,000 lbs. Assume the material of the bar has the following properti
A footing 3m X 3m carries a pressure of 500 kN/ m2 at a depth of 1m in a sand substrate. The saturated unit weight of the sand is 20 kN/ m3 and the unit weight above the water table is 18 kN/ m3.
Tank A has a volume of 100 liters and contains saturated vapor r-134 at 30C. With the valve open slightly flow enters cylinder B. a pressure of 200kpa is required to lift piston in b. the process en