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the If the probability that fluorecent light has a useful life of at least 500 hours is 0.85, find the probabilities that among 20 such lights
(a) 18 will have a useful life of at least 500 hours;
(b) At least 15 will have a useful life of at least 500 hours;
(c) At least two will not have a useful life ot at least 500 hours
A room has a floor area of 500 m^2 and a height of 4 m. THe room is involved in a fire with a constant energy release rate of 1 MW. calculate the time till the smoke layer is 1.5 m from the floor for (a) the case where the leakage areas are at the ..
For some minerals color is a diagnostic property making identification rather easy. However, certain minerals can also occur in a wide variety of colors making color a poor tool for identification. List different colors for the mineral quartz lo..
A hazardous waste incinerator is to burn 200 Kg/h of PCB waste that is 30 % PCB and 70 % organic solvents. During testing phase, the concentration of PCB in the emission was recorded as 0.025 g/ m³
A tank contains 0.05 m^3 of nitrogen gas at -21 C and 10 MPa. Determine the mass of nitrogen, in kg, using: a) the ideal gas model b) data from the compressibility chart Comment on the applicability of using the ideal gas model for nitrogen at thi..
At a local engineering firm, a supervisor thinks about buying a new copy machine for $700 but only wants to keep it for 3 years. Using the DDB find the book value of the machine at the end of 2 years.
The state highway department is considering six routes for a new highway. Listed below are the estimated construction costs, maintenance costs, and the user cost associated with each route.
The velocity of flow toward the sphere along the longitudinal axis is found to be u = - U0 (I - r~/_xl), where r0 is the radius of the sphere and x the distance from its center.
During a 5 hour storm event, the precipitation over a 230-acre area is 1.5niches. There is constant infiltration at a rate of 0.12 inches/hour and the depession storage is 17 acre-ft. Is there any runoff from the area during the storm
The steam flow rate entering the pipe is 2500kg/hr. Due to heat loss from the pipe to the surrounding air (at 25 C) 20 kg/hr of condensate is formed in the pipe and removed at the end of the pipe.
A very small country has just gained independence in the year 2000, at which time its population was 1,000. The new country has a birth rate of 0.02 yr-1, death rate of 0.004 yr-1, immigration rate of 0.01 yr-1, and emigration rate of 0.005 yr-1.
An existing power plant has been found to produce SO2 concentration of 20µg/m3 at a distance of 800m directly downwind from the stack when the wind is 4m/s from the north during a class C stability situation.
Given that the gate is 3 m wide and will just start to open when water height reaches 6 m, determine the weight of the gate.
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