Need it fast, Mechanical Engineering

Assignment Help:
PROBLEM 1 (30 points)
Consider a Boeing 747-400 at weight close to the maximum takeo? weight (MTOW) cruising at
Mach 0.82 at an altitude of 32000 ft.
(a) How much thrust is needed to maintain cruise? Express your answer in kN and as a fraction of
the weight.
(b) What is the diameter of a sphere that would have the same drag as the Boeing 747-400 at the
same cruise conditions? How does the sphere diameter compare to the wing span of the 747?
PROBLEM 2 (30 points)
D
Shear stress t
Blood cells sustain serious damage (hemolysis) when they are subjected to shear stress exceeding
150 Pa. During blood transfusion, blood ?ows through a syringe needle with typical inner diameter
D= 0.603 mm. See chart at http//en.wikipedia.org/wiki/Needle_gauge_comparison_chart.
It’s the 20-gauge needle). The intent is to transfuse blood as quickly as possible without damaging
the cells.
The ?ow ?eld inside the syringe needle is well approximated by Poiseuille’s law (you can look it up
in the book), which can be worked out to give the following relation between the volume ?ow rate
Q and the wall shear stress t (the wall stress is the maximum stress):
Q =
1
32
pD3
µ
t
Here µ is the viscosity of the blood. Your task is to recommend to the administering doctor the
maximum permissible blood ?ow rate. Do your calculations in SI units, then convert your ?nal
answer to L/min (liters per minute, a unit that doctors understand...).
For the average human, how long will it take to replace their entire blood volume?
1

Related Discussions:- Need it fast

Belt conveyors, Figure aside shows a belt conveyors which consists of...

Figure aside shows a belt conveyors which consists of endless belt. It has a power driven pulley at one end which moves the belt or downward flow of materials. General

CFD PHOENICS, expert with PHOENICS software experience for CFD free convect...

expert with PHOENICS software experience for CFD free convection

Themodynamic, vacuum gauge indicates that the pressure of air in a closed c...

vacuum gauge indicates that the pressure of air in a closed chamber is 0.2bar(vacuum).The pressure of the surrounding atmosphere is equilent to a 750-mm column of mercury.The densi

The dimension style command-autocad, The Dimension Style Command The Di...

The Dimension Style Command The Dimension Style command can be used to change appearance of dimensions. The best method  to create a new style before you can start creating dim

Flange assembly with bolt tensioning, Q. Flange Assembly with Bolt Tensioni...

Q. Flange Assembly with Bolt Tensioning? Measure the free length of the bolts ultrasonically. This must be done prior to applying any load to the bolt. Install bolts on the

Mechanism and machine, define frame of a machine. which link of the machine...

define frame of a machine. which link of the machine is known as frame?

Structural notches-metallurgical defects, Structural notches In t he ca...

Structural notches In t he case of solid solution strengthened alloys and age hardenabled steel, the variation in heat i/o during welding may cause localized grain coarsening o

Difficulties with motion sickness, In designing rotating space stations to ...

In designing rotating space stations to give for artificial-gravity environments, one of the constraints that must be considered is motion sickness. Studies have shown that the neg

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd