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Debora [2.8K]
3 years ago
12

Someone claims that the shear stress at the center of a circular pipe during fully developed laminar flow is zero. Do you agree

with this claim? Explain.
Engineering
1 answer:
pishuonlain [190]3 years ago
4 0

Answer: True

Explanation:The shear stress is a force that causes layers of a substance to slide above each other in opposite direction, it is usually represented by (tau) the THE SHEER STRESS IS DIRECTLY PROPORTIONAL TO THE VELOCITY GRADIENT. AT THE CENTER OF A PIPE DURING A LAMINAR FLOW, THE VELOCITY GRADIENT IS ALWAYS ZERO.

sheer stress is the main cause of downward movement of the materials of the earth and it is the leading cause of earthquakes.

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Explanation:

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3 years ago
Read 2 more answers
A rectangular block of material with shear modulus G= 620 MPa is fixed to rigid plates at its top and bottom surfaces. Thelower
PIT_PIT [208]

Answer:

γ_{xy} =0.01, P=248 kN

Explanation:

Given Data:

displacement = 2mm ;

height = 200mm ;

l = 400mm ;

w = 100 ;

G = 620 MPa = 620 N//mm²;    1MPa = 1N//mm²

a. Average Shear Strain:

The average shear strain can be determined by dividing the total displacement of plate by height

γ_{xy} = displacement / total height

     = 2/200 = 0.01

b. Force P on upper plate:

Now, as we know that force per unit area equals to stress

τ = P/A

Also,  τ = Gγ_{xy}

By comapring both equations, we get

P/A = Gγ_{xy}   ------------ eq(1)

First we need to calculate total area,

A = l*w = 400 * 100= 4*10^4mm²

By putting the values in equation 1, we get

P/40000 = 620 * 0.01

P = 248000 N or 2.48 *10^5 N or 248 kN

6 0
3 years ago
If a cylindrical part with a length of 20 mm and a diameter of 20 mm is to be machined to a cylindrical part with 18 mm in diame
bulgar [2K]

Answer:

Titanium Alloy

Explanation:

Length ( L ) = 20 mm

D1 = 20 mm

d2 = 18 mm

l = 20 mm

Mechanical efficiency = 50%

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cutting rake angle = 0°

cutting speed ( v ) = 10 m/s

<u>Determine the material to be for the cylinder </u>

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80  = Fc * 10 m/s

therefore Fc = 80 / 10 = 8 N

Hence the material we can use is Titanium Alloy   due to low cutting force value

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4 years ago
If the pressure of a confined liquid is doubled, the volume will do what?
slava [35]

Answer:

Boyle's Law simply describes the relationship between the pressure and volume of an enclosed gas when Temperature remains constant. Tripling the pressure will reduce its volume to 1/3, and so on. Alternatively, if you double the volume available to an enclosed gas, pressure is halved.

Explanation:

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