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

Piping inspection and test plan, Q. Piping Inspection and Test Plan? Pi...

Q. Piping Inspection and Test Plan? Piping Inspection and Test Plan review and Piping Materials Test Results review shall be by the Piping Materials group, or by / with assista

Describe root-finding techniques, In mechanics, stress is a measure of the ...

In mechanics, stress is a measure of the internal forces acting within a deformable body. Quantitatively, it is a measure of the average force per unit area of a surface within the

Determine the angle of jet, A jet of water moving at 8 m/sec. impinges on a...

A jet of water moving at 8 m/sec. impinges on a concave-shaped vane to deflect the jet through 120 o when stationary. If the vane is moving at 5 m/sec., determine the angle of jet

Determine the largest value of force, Do not round intermediate calculation...

Do not round intermediate calculations; however for display purposes report intermediate steps rounded to four significant figures. Give your final answer(s) to three significant f

#titlej..joining process, what is weldability?

what is weldability?

Rankine Cycle, In a nuclear power plant saturated steam at 30 bar enters a ...

In a nuclear power plant saturated steam at 30 bar enters a h.p. turbine and expands isentrophically to a pressure at which its quality is 0.841. At this pressure the steam is pass

Composite materials, Composite Materials While two various materials w...

Composite Materials While two various materials which neither react chemically nor dissolve in every other are combined together so they form a composite materials. Individual

Various components of transmission system , Various Components of Transmiss...

Various Components of Transmission System Primary Drive Gear : It is mounted on crankshaft. It transfers power to primary driven gear. Primary Driven Gear : It is

Prove the parallelogram law of forces - mechanics, Prove the parallelogram ...

Prove the parallelogram law of forces: Assume that the two forces P and Q act at a point ' O ' as shown in figure given below. The force P can be represented in magnitud

Composities, example with its properties

example with its properties

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