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An electric motor powered blower is used to accelerate quiescent air (0 m/s) to a velocity of 10 m/s at a volume flow rate of 5 m^3/s. The density of air is 1.18 kg/m^3. The efficiency of the blower in converting the mechanical work of the motor to kinetic work of air is 70%. The efficiency of the motor in converting the electrical work to mechanical work is 95%. Ignoring the change in the potential energy of air, calculate
a) The cross-section area of the exit pipe of the blower.
b) The mass flow rate of the air exiting the blower?
c) The specific kinetic energy of air exiting the blower?
d) The rate of kinetic energy of air exiting the blower in unit of J/s?
e) The efficiency of this blower in converting electrical energy to kinetic energy of the exiting air?
what was its velocity during this time? (Hint: Take the origin to be the location of the radar.)
the molar heat capacity of liquid iron exceeds that of iron vapor by 2.5222calkthe molar heat of evaporation of liquid
case study pacific ltdre accounting issues year ending 30 june 2014from steven evans s.evanspacificlimited.com.ausent
determine the resultant internal normal force acting on the cross section through point of the signpost. the post is
Knowing that in the position shown the rod has angular velocity of 4 rad/s clockwise; determine the angular velocity of the rod after it has rotated through a 90°.
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As shown, a 150 lb bungee jumper wants to jump from the top of a 630 ft high bridge and be able to just touch the water below. Given that the bungee cord has a spring constant of 108 lb/ft, what should the bungee cord's relaxed length, l, be for t..
Why does a car engine stop when we turn the key even when the vehicle is running? The engine should run on alternator in case of a petrol engine and on it's own in case of a diesel engine. Then how does it stop exactly?
Consider a supersonic wind tunnel with test section Mach number of 2 and fixed geometry diffuser designed to operate with minimum stagnation pressure losses (smallest diffuser area).
How do you the bubble point temperature and Vapor mole fractions at the bubble-point for a mixture at 690kPa that is 10.0mol % ethylene, 40.0 mol % ethane, and 50.0 mole % propane. Use the Depriester chart.
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