Need it fast, PROBLEM 1 (30 points) Consider a Boeing 747-400 at weight close to the, Mechanical Engineering

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

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages

Need it fast, Mechanical Engineering

Related Discussions:- Need it fast

Structures of materials, what is the difference between atomic structure an...

Find out moment of inertia of circular area, Find out Moment of Inertia of ...

MECHNICS, FIND THE RESULTANT OF THE SYSTEM OF FORCES AND THE POINTS WHERE T...

Hot and cold working, What is the difference between hot and cold working

Types of couple - mechanics, Types of couple: Explain about different...

Chemistry, preparation of nylon

Illustrate different methods of merit rating, a) What are essential needs o...

Describe the working of a four stroke petrol engine, a) Describe main advan...

What is issued for approval, Q. What is Issued for Approval? This initi...

General phase of value engineering, General Phase of Value Engineering: ...

Write Your Message!

Featured Services

Online Tutoring

Project Development

Exam Preparation

Course Help

Assignment Help

Popular Subjects

Assured A++ Grade

Academics

Major Subjects

Majors

Get In Touch

TERMS & POLICIES

HELP & SUPPORT