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

Calculation of total energy - thermodynamics, T ota l Energy: Total ...

T ota l Energy: Total energy possessed by system is the sum of all types of stored energy. Thus it will be given by E total  = PE + KE + U = mgh + 1/2mv 2  + U It is ex

Cad-cam data exchange, CAD-CAM Data Exchange: The interface SET transf...

CAD-CAM Data Exchange: The interface SET transferred information on wire-frames, surfaces, B-representation and FEM models as well as technical drawings and scientific data. I

Heavy traffic areas in pumps, Q. Heavy traffic areas in pumps? These ar...

Q. Heavy traffic areas in pumps? These are areas around pumps, filters, control valves, PSV's and other equipment requiring frequent maintenance or servicing. Piping attache

What is specific gravity?, What is specific gravity? what do you mean by 1p...

What is specific gravity? what do you mean by 1pascal? Concept of pressure difference? Sol) The "specific gravity" of a meterial is the ratio of its density to the density of

Factor of safety - working stress, Factor of Safety: Factor of saf...

Factor of Safety: Factor of safety is number used to determine working stress. It is fixed based on experimental works on material. It accounts all uncertainties like, mate

What are the approaches to the design of retaining walls, What are the appr...

What are the approaches to the design of retaining walls? The approach to the design of retaining walls can be started as follows: a. Chosse a trial dimension of the wall

At what speed must the chamber move , The National Aeronautics and Space Ad...

The National Aeronautics and Space Administration (NASA) studies the physiological effects of large accelerations on astronauts. Some of these studies use a machine known as a cent

Find out extension, Find out extension: Q: A bar having length 25mm h...

Find out extension: Q: A bar having length 25mm has varying cross section. It carries load of 14KN. Find out extension if cross section is given by (6 + x 2 /100) mm 2

WELDING, WHAT IS DIFFERENCE BETWEEN POROSITY AND BLOW HOLE

WHAT IS DIFFERENCE BETWEEN POROSITY AND BLOW HOLE

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