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Spring 2017
UNIVER
CIVE 102 Engineering Concepts and Solutions
Due Date: May 4th, 2017 at the beginning of class
Homework #3
1) A 5 horsepower, 75% efficient motor is used to raise a container 10 meters. If the
container is full of bromine ($Br_2$) and has a total mass of 500 kilograms, how long does it
take the motor to accomplish the task in units of seconds? Density of bromine ($Br_2$) =
3,120 $kg/m^3$, 1 horsepower = 550 (ft lb)/s
2) The Euler number is a function of the pressure drop, velocity and density. Determine the
form of the Euler number with Rayleighs method.
• Pressure drop\Delta P Pascal
• Density d grams per cubic centimeter
• Velocity v meters per second
3) When a simple turbine mixing, the following variables are involved. Determine a set of
dimensionless groups for the turbine, using Rayleighs method.
• Power requirement P Watt
• Shaft speed N hertz
• Blade diameter D meters
• Blade width W meters
• Liquid density d $kg/m^3$