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

Complete outer clutch lugs for deep cuts, Complete outer clutch lugs for de...

Complete outer clutch lugs for deep cuts : Visually check for any deep cuts formed on the outer complete clutch lugs.

Communication, is effective commucation an intergral aspect in the mecheni...

is effective commucation an intergral aspect in the mechenical engineering field?

Matlab program of location a point with respect a line, matlab program of l...

matlab program of location a point with respect a line

Brittle material, hello. what is the shape of the fractur of brittle materi...

hello. what is the shape of the fractur of brittle material after applied th tensil test.

Woodwork, with the aid of notes and sketches describe how you would transfe...

with the aid of notes and sketches describe how you would transfer the design from a sheet of paper onto the wooden panel prior to carving

Discuss the inversions of double slider crank chain, a) Describe and illust...

a) Describe and illustrate the terms with their classification: Mechanism, Kinematic, Machine links and Kinematic pair. b) Discuss the Inversions of double slider crank chain an

Gun fires - projectile motion, Gun fires - projectile motion: A gun fi...

Gun fires - projectile motion: A gun fires a projectile along with a muzzle velocity of 300 m/sec as illustrated in Figure. Find its angle of inclination so that it strikes a

Equipment for resistance welding-measurements, EQUIPMENT FOR RESISTANCE WEL...

EQUIPMENT FOR RESISTANCE WELDING-Measurements Measurement of the parameters are important while fixing the parameters or testing a machine. Resistance welding instrumentation s

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