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3 years ago

11

For unrestrained cube made from linear, isotropic, homogeneous material the temperature increase causes strain in_____ direction

(s) and stress in _____ direction(s).
one; one
two; two
three:three
four; four
five; five
six six
none of the above

1 answer:

LenKa [72]3 years ago

7 0

Answer: The answer is four; four

Explanation: This is because of the mixture of material used and the number of directions it causes strain I directly proportional to the number of times it causes stress.

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Relationship between civil engineering and geology

natka813 [3]

Answer:

Geological and civil engineers sometimes work together, but have very different responsibilities. While geological engineers study the earth's inner and outer surface to evaluate potential mining and infrastructure construction sites, civil engineers design the infrastructure to be built.

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3 years ago

In a shear box test on sand a shearing force of 800 psf was applied with normal stress of 1750 psf. Find the major and minor pri

ryzh [129]

Answer:

The major and minor stresses are as 2060.59 psf, -310.59 psf and 1185.59 psf.

Explanation:

The major and minor principal stresses are given as follows:

$\sigma_{max}=\dfrac{\sigma_x+\sigma_y}{2}+\sqrt{\left(\dfrac{\sigma_x-\sigma_y}{2}\right)^2+\tau_{xy}^2}$

$\sigma_{min}=\dfrac{\sigma_x+\sigma_y}{2}-\sqrt{\left(\dfrac{\sigma_x-\sigma_y}{2}\right)^2+\tau_{xy}^2}$

Here

$\sigma_x$ is the normal stress which is 1750 psf
$\sigma_y$ is 0
$\tau_{xy}$ is the shear stress which is 800 psf

So the formula becomes

$\sigma_{max}=\dfrac{\sigma_x+\sigma_y}{2}+\sqrt{\left(\dfrac{\sigma_x-\sigma_y}{2}\right)^2+\tau_{xy}^2}\\\sigma_{max}=\dfrac{1750+0}{2}+\sqrt{\left(\dfrac{1750-0}{2}\right)^2+(800)^2}\\\sigma_{max}=875+\sqrt{\left(875)^2+(800)^2} \\\sigma_{max}=875+\sqrt{765625+640000}\\\sigma_{max}=875+1185.59\\\sigma_{max}=2060.59 \text{psf}$

Similarly, the minimum normal stress is given as

$\sigma_{min}=\dfrac{\sigma_x+\sigma_y}{2}-\sqrt{\left(\dfrac{\sigma_x-\sigma_y}{2}\right)^2+\tau_{xy}^2}\\\sigma_{min}=\dfrac{1700+0}{2}-\sqrt{\left(\dfrac{1700-0}{2}\right)^2+(800)^2}\\\sigma_{min}=875-\sqrt{(875)^2+(800)^2}\\\sigma_{min}=875-\sqrt{765625+640000}\\\sigma_{min}=875-1185.59\\\sigma_{min}=-310.59 \text{ psf}$

The maximum shear stress is given as

$\tau_{max}=\dfrac{\sigma_{max}-\sigma_{min}}{2}\\\tau_{max}=\dfrac{2060.59-(-310.59)}{2}\\\tau_{max}=\dfrac{2371.18}{2}\\\tau_{max}=1185.59 \text{psf}$

5 0

3 years ago

A well-insulated rigid tank contains 5 kg of a saturated liquid–vapor mixture of water at 200 kPa. Initially, three-quarters of

vlabodo [156]

Answer:

$S_{gen} = 18.519\,\frac{kJ}{K}$

Explanation:

Given that rigid tank is a closed system, the following model is constructed after the First Law of Thermodynamics:

$W_{heater} + U_{sys,1} - U_{sys,2} = 0$

$W_{heater} = U_{sys,2} - U_{sys,1}$

$W_{heater} = m\cdot (u_{2}-u_{1})$

The entropy generation inside the rigid tank is determined by appropriate application of the Second Law of Thermodynamics:

$S_{sys,1} - S_{sys,2} + S_{gen} = 0$

$S_{gen} = S_{sys,2} - S_{sys,1}$

$S_{gen} = m\cdot (s_{2}-s_{1})$

The properties of the steam are obtained from steam tables:

Intial State

$P = 200\,kPa$

$T = 120.21\,^{\textdegree}C$

$\nu = 0.2222\,\frac{m^{3}}{kg}$

$u = 1010.7\,\frac{kJ}{kg}$

$s = 2.9294\,\frac{kJ}{kg\cdot K}$

$x = 0.25$

Final State

$P = 869.567\,kPa$

$T = 173.88\,^{\textdegree} C$

$\nu = 0.2222\,\frac{m^{3}}{kg}$

$u = 2578.6\,\frac{kJ}{kg}$

$s = 6.6332\,\frac{kJ}{kg\cdot K}$

$x = 1.00$

The entropy change of the steam during the process is:

$S_{gen} = (5\,kg)\cdot \left(6.6332\,\frac{kJ}{kg\cdot K} - 2.9294\,\frac{kJ}{kg\cdot K} \right)$

$S_{gen} = 18.519\,\frac{kJ}{K}$

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4 years ago

Rearrange these phrases to form an important reminder. This acronym is a reminder of the most common types of hazards or injurie

Nastasia [14]

BE SAFE = Burns Electrocution Shock Arc Flash Fire Explosions

Explanation:

Burn-A burn is the most common one,caused by electrical, flash or thermal contact.

Electrocution-A fatal one which mean killing by electricity and it occurs when your are in contact with a lethal amount of electrical energy

Shock-occurs when the body becomes part of an electrical circuit.Happens as a reflex action to passage of electrical current through the body

Arc Flash-In the presence of high voltage gap, there is a sudden release of electrical energy through the air.It releases heat and intense light that could cause a burn.

Fire- it results when there is a fault in wires, cords, switches, or plugs that can result to release of electrical fires.

Explosions-Electricity can ignite to release an explosive mixture of materials in the air.

Learn More

Electricity safety :brainly.com/question/7221343

Keywords : phrases, reminder, acronym, hazards, injuries, electricity

#LearnwithBrainly

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4 years ago

Assume a flash memory can have 6 levels {0, 1, 2, 3, 4, 5} and the errors can be of limited value of magnitude 1 (i.e. a digit a

Elena-2011 [213]

Answer:

Explanation:

/* General Code for achieving perfect error for any level and any

digit of codewords*/

#include<iostream>

using namespace std;

int main(){

int level;

//Input memory levels.

cout <<" Enter number of Flash Memory levels : ";

cin>>level;

//construct array store levels.

int lvl[level];

for(int i = 0; i < level; i++){

//assign levels name

lvl[i] = i;

}

int digit;

cout << "Enter number of digit codewords :";

//Taking input of codeword digits

cin >> digit;

for(int i = 0; i < level;){

//output Codeword

cout << lvl[i];

//Skipping for n number digit codeword in level

i+=(digit+1);

}

}

/*

a) i from 0 to (i = i+(2+1))<levels

b) for length (1) -> 3 codewords

codewords -> {0,2,4}

for length (2) -> 2 codewords

codewords -> {0,3}

*/

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3 years ago