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The estimated accuracy of a sound-intensity measurement is usually expressed in decibels. Calculate the uncertainties in intensity in watts per square centimeter corresponding to ±1, ±2, and ±3 dB. Express these as percentage values at sound levels of 50, 80, and 120 dB.
An engine block with a surface area measured to be 0.90m2 generates a power output of 55 kW with a net engine efficiency of 35%. The engine block operates inside a compartment at 157oC and the average convection heat transfer coefficient of 60 W/m..
a system changes its state from state 1 to state 2 following pvconstant.. the pressure p and specific volume v at state
The road surface varies sinusoidally with an amplitude of and a wavelength of 6 m. Write a MATLAB program to find the displacement amplitude of the automobile for the following conditions
A constant-volume tank contains 5 kg of air at 100 kPa and 327°C. The air is cooled to the surroundings temperature of 27°C. Assume constant specific heats at 300 K.
A common approach to system testing is to test the system until the testing budget is exhausted and then deliver the system to customers. Discuss the ethics of this approach for systems that are delivered to external customers.
Consider an elastomer matrix composite reinforced with steel cord (1 mm length and 0.5 mm diameter). What is the minimum fracture stress for the steel cord, if the interfacial shear strength is 20 MPa?
in a rankine cycle with reheat steam at 500c expands in a high pressure turbine until it reaches the saturated vapor
Systems Integration at London Heathrow Terminal 5' the authors identify six processes required to execute a megaproject. They note that in each megaproject there is discontinuity between the processes required to deliver the project and those invo..
Briefly discuss the key difference between the step-growth polymerization and the chain-growth polymerization.
Circulating a steady state turbine 20000 kg / h of steam at 4 bar entering and 440 ° C and leaves at 0.20 bar and 90% quality. A heat of 20 kJ / kg is lost. The inlet has a diameter of 8 cm and the output section is rectangular, of dimensions 0.9 m ..
Air (ideal gas) inside a cylinder filled with a frictionless piston undergoes a polytrophic process having an exponent n = 1.33. The initial pressure of the air is 3.34 MPa and the T (final) is 750 K and during the process the volume of the air is in..
r-134a at 800 kpa and 100 c enters an adiabatic nozzle steadily with a velocity of 20ms and leaves as sat-v at 400 kpa.
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