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

Impeller design, The function of the impellers is to: (i) reduce bubble siz...

The function of the impellers is to: (i) reduce bubble size thereby increasing the surface area for oxygen transfer, and (ii) maintain a uniform environment, nutrient supply and he

Dimension commands-autocad, Dimension Commands: For example, the illust...

Dimension Commands: For example, the illustration above shows two different dimension styles. The one on the left is the default style known as STANDARD. If you do not create a

Describe about push-pull welds, Q Describe about Push-pull welds? - A ...

Q Describe about Push-pull welds? - A push-pull system employs transformers with an electrically reversed polarity arrangement wherein two transformers complement each o

Wrought al alloys, Wrought Al Alloys This aluminium alloys are acquir...

Wrought Al Alloys This aluminium alloys are acquired by addition of Mn and Mg. The Al-Mn and Al-Mg alloys cannot be heat treated. Al-Mn alloy combines high ductility along wi

Construction of steam turbine , Construction of steam turbine : CONST...

Construction of steam turbine : CONSTRUCTIO N DETAILS: 1 . Casing: It is made out of cast steel. The casing has rotor inside it. 2 .  Rotor: It carries blades o

Show dike heights and distance from containers, Wall-type bunds / dikes for...

Wall-type bunds / dikes for storage compounds should be from 0.5 m to 1.5 m high (1.5 ft. - 5 ft. - check local codes and regulations), depending on the required containment capaci

Measurement of hardenability, Measurement of Hardenability: Two testi...

Measurement of Hardenability: Two testing techniques have been enhancement to measure the harden-ability of steels. The first, termed as cylinder series test, offers a single

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