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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 replacing them successively as they burn out. The light bulbs have independent lifetimes.
What is the smallest number of bulbs to be purchased so that the succession of light bulbs produce light at least 40 month with probability at least 0.9772?
What is the terminal settling velocity of a particle with a specific gravity of 1.4 and a diameter of 0.01 mm in 20 degrees celcius water. What is the smallest diameter particle of specific gravity 1.4
The rain¬fall amounts at three adjacent stations A, B, and C were 4.2, 3.7, and 4.9 in., respectively. The average annual precipitation amounts for the gauges are X = 36.5, A = 42.1, B = 37.1, and C = 39.8 inches.
In a hydrometer test, the data recorded at 60 minutes after the start of the test are as follows: Gs = 2.6, temperature of water T = 24°C and L = 9.2 cm. What is the diameter D of the smallest-sized particles
Soil with a unit weight of 19.65 kN/m^3 is loaded on the ground surface by a strip load of 1.5 m wide. The strip load is 365 kN/m of wall length. Determine the vertical stress increment due to the strip load and the total pressure
A rigid-walled cubical container is completely filled with water at 40 0F and sealed. The water is then heated to 100 0F. Determine the pressure that develops in the container when the water reaches this higher temperature
It is known that a horizontal curve starts (has PC) 90m before the vertical curve's PVC. If the superelevation of the horizontal curve is .08 and the central angle is 38 degrees what is the station of the PT
A simple horizontal curve of radius 750 ft connects two tangents that intersect at an angle of 66º30'. Compute the parts of the curve, including T, L, LC, E, M, and D.
A space is at a temperature of 75 F, and the relative humidity is 45 percent. find the partial pressures of the air and water vapor
A large residence consumes 3705 kWh of electrical energy over a billing period. Determine the total charge for the billing period based on the rate schedule provided. The margin of error is $0.5
Using Darcy's Law, calculate the quantity of groundwater (L/day), the seepage velocity (m/s), and the contaminant loading (Kg/day) to the river (assuming no retardation) for the following scenario. Be sure to include both a plane view and cross-se..
Determine the payback period for an asset that has a first cost of $40,000, a salvage value of $8000 anytime within 10 years of its purchase, and generates income of $6000 per year.
Moist air at standard conditions is at a dry bulb temperature of 80 degree F and a relative humidity of 50%. It is cooled to 50 degree F. Use the psychromtric chart to determine: a- The energy removed from the air after it is cooled in BTU/lb of d..
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