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An engineering student considers using a fan as a levitation demonstation. She plans to face the box-enclosed fanso the air blast is directed face down through a 3 ft diameter blade span area. The system weighs 5 lbf, and the student will secure the system from rotating. By increasing the power to the fan, she plans to increase the blade rpm and air exit velocity until the exhaust provides sufficient upward force to cause the box fan to hover in the air. Determine (a) the air exit velocity to produce 5 lbf (b) the volumetric flow rate needed and (c) the minimum mechanical power that must be supplied to the airstream. Take the air density to be .081 lbm/ft^3.
a 6 nominal pipe size schedule 40 steel pipe has a chamfered entrance and 300 ft. long. the velocity is 20 ft per sec.
an aircraft landing gear has a probability of 10-5 per landing of being damaged from excessive impact. assuming a
a particulate monitor has a power supply consisting of two batteries in parallel. either battery is adequate to operate
a train track is designed with a radius of 20 meters. the train will be unsafe if the normal acceleration is greater
while riding a horse at 8 ms at 25 degrees to the north of east a rider sees a buffalo he wants to shoot. the buffalo
examine the below topic and provide a hypothesis for which you would use the one-tailed and two-tailed t test to
a conducting solid sphere of radius 20.0 cm is located with its center at the origin of our three-dimensional
a sharpening stone at rest is brought to 300 rpm over 2 mins. at that point a dull sword edge is placed against the
a boy weighing 3.9 102 n jumps from a height of 1.80 m to the ground below. assume that the force of the ground on his
a two inch diameter craft ball is thrown vertically. this initial velocity of the ball is 20 fts.a. neglecting drag
a rankine power cycle operates with an open feedwater heater. the boiler pressure is 6.0 mpa. a superheater provides a
a 4140 steel alloy beam is designed to support a load at 50 of the yield stress. the beam is bolted to a bridge truss
A steam turbine is operated ith an input temp of 800C and exhaust temp of 150C. What is the maximum amount of work the turbine can do for a given heat input Q? Under what conditions is the maximum achieved?
A Brayton cycle uses air and produces a net work of 14000 Btu/s with an inlet state of 60°F,
a solid cylindrical workpiece made of 5052-o aluminum is 12 cm high and 8 cm in diameter. assuming there is no
a skydiver jumps from a ballon and falls freely for 6 seconds. her parachute then opens decelerating her at a constant
to a man walking with a speed of 2 ms the rain appears to fall vertically. if the velocity of rain is 4 ms calculate
a poly-dispersed aerosol consists of spherical particles within the size range 1.0-10.0 micrometers. the particles are
Design the number of teeth and depth of teeth need be chosen. Considerations include the turn angle for each stroke, the bearing stress on the teeth and pins and shear stress on the teeth.
use entropy balance for a closed system to determine whether the entropy change of the following processes is positive
a sample of argon of mass 10.4 g occupies 2100 ml at 30 degrees.i calculate the work done by the gas when is expands
certain system is able to exert an external force f according to the relationship.v velocityf 15000-500vn for v lt
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