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White noise has a constant level when measured in frequency bands of constant width. Suppose a noise generator produces white noise over the octave bands 0.5,1,2,4,8 khz. Find the overall un weighted and a-weighted sound pressures if a sound pressure level of 90 dB is measured in the 4kHz octave band.
The 8-lb block slides in a frictionless slot that lies in the vertical plane. The stiffness’s of springs A and B attached to the block are kA =40 lb/ft and kB= 20 lb/ft. When the block is in position 1, spring A is compressed 0.5 ft and spring B is u..
Assuming that you are a process engineer in charge of melting and casting for making an alloy that consists of 40 at% Ag and 60 at% Ni. Calculate how many grams of Ag and Ni you need to weigh to make a 400-gram solder alloy with such a composition. G..
a heat engine accepts 200000 btu of heat from a source at 1500 r and rejects 100000 btu of heat to a sink at 600 r.
a steel bar and an aluminum bar are joined end to end and fixed between two walls. the cross sectional area of the
initially an insulated rigid tank contains 18.67 kg of water at 21.45oc and 101 kpa. the tank also contains a 3.66 kg
The wheel of a crane lift is rolling on a flat rail. The radius of the wheel is 4 in, the contact length and force are 2.5 in and 1 ton respectively, and E = 30 MPa and ν = 0.3 for both parts. Determine (a) the maximum contact pressure, (b) the wi..
saturated steam at 2 mpa is contained in a piston-cylinder device. the initial volume is 0.25 cubic meters. heat is
Propane at 8 bars and 80oC is contained in a closed, rigid vessel with a volume of 10 m3 . Its temperature drops due to heat transfer to the surroundings. Determine (a) the temperature at which condensation first occurs and (b) the fraction of the to..
on an oil tanker saturated steam at 44 bar is supplied to deck auxiliaries through a steel pipe of 124 mm bore and 18
Determine the factor of safety against net section yield in the presence of the crack and determine the factor of safety against brittle fracture for the same conditions.
ten grams of liquid water at 95 c are contained in the insulated container shown. the pin holding the frictionless
a 6-cylinder 3.8 l spark ignition engine operating on the ideal otto cycle takes in air at 104 kpa and 20 degrees
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