Five-hundred moles per minute of liquid benzene (300 K and 3.0 bar) enters a steady state heater. The benzene leaves the heater as a superheated vapor (450 K and 3.0 bar). What rate of heat addition is needed to achieve this change? Assume the heat of vaporization is not a function of pressure. Note: The vapor pressure of benzene is given by the following relationship:
lnPsat = 13.8594 – 2773.78/(T-53) where P [=] kPa and T [=] K
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An online patient diagnostics system for surgeons has the following point estimates: A first cost of $200,000 to install and $5000 annually to maintain over its expected life of 5 years. Added revenue is estimated to average $60,000 per year. Examine the sensitivity of present worth at a MARR of 10% per year to variation in selected parameter estimates, while others remain constant. Sensitivity to revenue variation: $45,000 to $75,000 (?25% to + 25%).
What will be an ideal response?
Toxic organic compounds that contaminate soils are an environmental problem because they may:
A) contaminate or be taken up by plants and so cause toxic effects to animals or people eating the plants. B) leach to groundwater cause toxic effects in drinking water or aquatic ecosystems. C) kill or inhibit soil organisms (other than any pest targeted). D) kill or injure plants (other than any target weeds). E) all of the above
The rain sense module (RSM) can turn on the wipers by communicating with the _________
A) Wiper motor B) Instrument cluster C) BCM D) PCM
All of these can cause radio interference, EXCEPT ________
A) Defective alternator B) Fault in the ignition system C) Open in the radio power circuit D) Loose ground wire