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

Determine the velocity in a moving frame of reference, Determine the veloci...

Determine the velocity in a Moving Frame of Reference: As illustrated in Figure, a ship A moves with a velocity v A = 40 km/hour whereas ship B moves with a velocity of v B

Determine reactions at supports, Determine reactions at supports: Det...

Determine reactions at supports: Determine reactions at supports of supported beam of 6m span carrying increasing load of 1500N/m to 4500N/m from one end to another end.

Material handling, how the car manufacturing company handle the material

how the car manufacturing company handle the material

Production function for bicycles, Let B be the number of bicycles formed  f...

Let B be the number of bicycles formed  from F bicycle frames and T tires. Each bicycle require exactly two tires and one frame. a. Sketch the isoquants for bicycle production.

Two stroke engine - thermodynamics, T w o Stroke Engine In the two st...

T w o Stroke Engine In the two stroke engine, instead of valves ports are given, these are opened and closed by moving piston. Through inlet port, the mixture of air and fuel

Klein''s construction, what is the velocity and acceleration when connectin...

what is the velocity and acceleration when connecting rod and crank are mutually perpendicular?

THERMODYNAMICS, WHY THE WATER INSIDE ANY PLASTIC TUBE GETS EXPAND WHEN THEY...

WHY THE WATER INSIDE ANY PLASTIC TUBE GETS EXPAND WHEN THEY FROZEN?

Cast al alloys, Cast Al Alloys Low melting temperature, good surface f...

Cast Al Alloys Low melting temperature, good surface finish and insolubility to gases except H 2 are characteristics of these alloys. Significant drawback of cast aluminium a

Volume fraction of fibres, Volume fraction of fibres: The epoxy materi...

Volume fraction of fibres: The epoxy material is prepared to be stressed to its full strength. What must be volume fraction of fibres? Solution Here σ′ = 1200 MPa,

Types of polymerisation, types of polymerisation in mechanical enginnering

types of polymerisation in mechanical enginnering

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