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nydimaria [60]
3 years ago
11

If you measured a pressure difference of 50 mm of mercury across a pitot tube placed in a wind tunnel with 200 mm diameter, what

is the velocity of air in the wind tunnel? What is the Reynolds number of the air flowing in the wind tunnel? Is the flow laminar or turbulent? Assume air temperature is 25°C.
Engineering
1 answer:
mart [117]3 years ago
4 0

Answer:

V=33.66 m/s

Re=448.8\times 10^6

Re>4000, The flow is turbulent flow.

Explanation:

Given that

Pressure difference  = 50 mm of Hg

We know that density of Hg=136000Kg/m^3

ΔP= 13.6 x 1000 x 0.05 Pa

ΔP=680 Pa

Diameter of tunnel = 200 mm

Property of air at 25°C

ρ=1.2Kg/m^3

Dynamic viscosity

\mu =1.8\times 10^{-8}\ Pa.s

Velocity of fluid given as

V=\sqrt{\dfrac{2\Delta P}{\rho_{air}}}

V=\sqrt{\dfrac{2\times 680}{1.2}}

V=33.66 m/s

Reynolds number

Re=\dfrac{\rho _{air}Vd}{\mu }

Re=\dfrac{1.2\times 33.66\times 0.2}{1.8\times 10^{-8}}

Re=448.8\times 10^6

Re>4000,So the flow is turbulent flow.

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Answer:

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Explanation:

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6 0
3 years ago
Does a thicker core make an electromagnet stronger?
mel-nik [20]

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Yes

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6 0
3 years ago
Read 2 more answers
Consider the following relational database that Best Airlines uses to keep track of its mechanics, their skills, and their airpo
Musya8 [376]

Answer:

Explanation:

A)

SELECT MECHNAME,AGE FROM MECHANIC;

B)

SELECT AIRNAME,SIZE FROM AIRPORT WHERE SIZE>=20 AND STATE='CALIFORNIA' AND YEAROPENED >=1935 ORDER BY SIZE ASC;

C)

SELECT AIRNAME,SIZE FROM AIRPORT WHERE (SIZE>=20 OR YEAROPENED >=1935) AND STATE='CALIFORNIA';

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SELECT AVG(SIZE) FROM AIRPORT WHERE STATE='CALIFORNIA' AND YEAROPENED >=1935;

E)

SELECT COUNT(AIRNAME) FROM AIRPORT WHERE STATE='CALIFORNIA' AND YEAROPENED >=1935;

F)

SELECT COUNT(AIRNAME),STATE FROM AIRPORT WHERE YEAROPENED>=1935 GROUP BY STATE;

G)

SELECT COUNT(AIRNAME),STATE FROM AIRPORT WHERE YEAR OPENED>=1935 GROUP BY STATE HAVING COUNT(*)>=5;

H)

SELECT MECHNAME FROM MECHANIC A JOIN AIRPORT B

ON A.AIRNAME=B.AIRNAME AND B.STATE='CALIFORNIA';

I)  

SELECT MECHNAME FROM MECHANIC A

JOIN QUALIFICATION B

ON A.MECHNUM=B.MECHNUM

AND B.PROFRATE=4

JOIN SKILL C

ON B.SKILLNUM=C.SKILLNUM

AND SKILLNAME='FAN BLADE RELACEMENT';

J)  SELECT MECHNAME FROM MECHANIC A

JOIN QUALIFICATION B

ON A.MECHNUM=B.MECHNUM

AND B.PROFRATE=4

JOIN SKILL C

ON B.SKILLNUM=C.SKILLNUM

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6 0
2 years ago
Q5
Klio2033 [76]

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<h3>C++ Code</h3>

#include <stdio.h>

#include <stdlib.h>

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   _Bool check = 1;

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       temp1 = string2[i];

       temp2 = string2[i + 1];

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           i = 0;

       } else {

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       }

   }

   

   return 0;

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Read more about C++ programming here:

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1 year ago
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