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

Why we use nickel alloys in welding, Q. Why we use Nickel Alloys in welding...

Q. Why we use Nickel Alloys in welding? Nickel weld metals have high creep-rupture strength but often have lower stress-rupture ductility and lower mechanical and thermal fatig

Hydraulic detention time, a.The closest point to discharge treated effluent...

a.The closest point to discharge treated effluent is a lake, but the pipeline is extended so it discharges into the river draining the lake. This allows a conventional secondary tr

Calculate the minimum required cross-sectional area, A lifting shackle in a...

A lifting shackle in a glass-making factory is made from a special high-temperature stainless steel. It is expected that the shackle will experience a tensile load of 5kN and th

Determine normal force exerted on the plate, A 50 mm dia. jet having a velo...

A 50 mm dia. jet having a velocity of 18 m/sec. impinges without shock on a flat plate inclined at an angle to the axis of jet. If the plate is moving at 5 m/sec in the direction o

Stresses., temparature stresses in composite bars

temparature stresses in composite bars

Type of defects and their significance, TYPE OF DEFECTS AND THEIR SIGNIFICA...

TYPE OF DEFECTS AND THEIR SIGNIFICANCE   Defects in weldments in general can be classified as follows: I. Defects involving inadequate bonding Lack of fusion Incom

Strength of Materials, Determine formula for Elongnation of body due to it'...

Determine formula for Elongnation of body due to it''s Self Weight

Determine the maximum value of the coefficient of friction, Determine the m...

Determine the maximum value of the coefficient of friction: A force of 200 N inclined at 60 o to the horizontal is applied to the block A weighing 400 N. find out whether blo

Determine the work done by the gas system, (a) Derive the mathematical equa...

(a) Derive the mathematical equation for work done in a polytropic process (i.e.) PV n =c) (b) A mass of gas is compressed in a quasi-static process from 80KPa, 0.1m 3 to 0.4M

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