User Account

All Pages

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

Explain concept of radial drilling machine, Concept of Radial Drilling mach...

Concept of Radial Drilling machine Radial Drilling machine is a large gear headed drill press in which the head moves along the arm that radiates from the column of the machine

Shaft, Shaft: What is shaft? What duty is performed by shaft? What is...

Shaft: What is shaft? What duty is performed by shaft? What is the usual cross section and of what material it is generally made? Sol.: The shafts are generally cylindr

Vectors, Following sets of the three forces act on a body,. In which case r...

Following sets of the three forces act on a body,. In which case resultant cannot be zero? 1) 10N, 10N, 10N 2)10N, 10N, 20N 3)10N, 20N, 20N 4010N, 20N, 40N Ans)      In 4th

Processes , example on operation sheet?

example on operation sheet?

Quantitative Project Paper, Could I have 3 topic ideas with problem stateme...

Could I have 3 topic ideas with problem statement and research questions for each to pick one and send it to the expert? I have a project in Manufacturing Engineering, Master leve

Shear force.., A cantilever beam of 1800 mm length is subjected to point lo...

A cantilever beam of 1800 mm length is subjected to point loads of 3.5 kN, 4.3 kN, 1.2 kN and 2.8 kN at distances of 400 m, 400 m, 400 m 300 m and 300 m, respectively from the fixe

The force of friction, During paddling of a bicycle,the force of friction e...

During paddling of a bicycle,the force of friction exerted by the ground on the two wheels is? Ans) Since the rear wheel rotates by itself (we only paddle to rotate the fron wheel

Possitive wrench, whats is apossitive wrench??

whats is apossitive wrench??

Design ventilation systems for plant, Q. Design Ventilation Systems for pla...

Q. Design Ventilation Systems for plant? While some natural ventilation may sometimes be used, a pressurized HVAC (heating, ventilation and air-conditioning) system is more typ

What are relevant design considerations, What are relevant design considera...

What are relevant design considerations? The relevant design considerations may be summarized as follows: a. Main reinforcement (uniformly distributed) is placed in a longit

Write Your Message!

Captcha
Order Assignment

Featured Services

Order Now

Popular Subjects

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!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +91-977-207-8620

Phone: +91-977-207-8620

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

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