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3 years ago

For flow over a flat plate with an extremely rough surface, convection heat transfer effects are known to be correlated by the

Engineering

1 answer:

Greeley [361]3 years ago

8 0

Answer: the surface shear stress at x =1m from the leading edge of the plate is 4.1973 N/m²

Explanation:

Given that;

density s = 1.16 kg/m³

velocity = u = 50 m/s

kinetic viscosity r = 15.89 × 10⁻⁶ m²/s

xL = 1m from the leading edge of the plate

Now Reynold number (Rex)

Rex = UxL / r

Rex = (50 m/s × 1m ) / 15.89 × 10⁻⁶ m²/s

Rex = 3146633.1025

since Rex is greater than 5×10⁵ { Turbulent flow }

so Local skin friction coefficient

⇒ Cfx = 0.0577 / (Rex)^1/5

Cfx = 0.0577 / (3146633.1025)^1/5

Cfx = 0.0028947

Now Shear stress (y)

y = Cfx × 1/2 × su²

y = 0.0028947 × 1/2 × 1.16 × (50)²

y = 4.1973 N/m²

∴ the surface shear stress at x =1m from the leading edge of the plate is 4.1973 N/m²

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Describe the "Bauschinger Effect" on the stress strain behaviour of steel

Rom4ik [11]

Answer:

The Bauschinger effect is the directionally determined change in the elasticity limit of a metal or alloy after primary plastic deformation. If you first deform a metal in one direction so that it is plastically deformed and then deform it in the opposite direction, the elastic limit in the opposite direction is lower.

From the point of view of the dislocation mechanism of plastic deformation, the Bauschinger effect indicates that during repeated deformation, it is easier for dislocations blocked in front of obstacles to move in the direction opposite to their movement during preliminary plastic deformation.

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4 years ago

List five pieces of personal safety equipment which must be in everyday use in the workshop

tatyana61 [14]

Answer:

safety glasses, hearing protection, respirator, work gloves, and work boots.

Explanation:

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3 0

3 years ago

A tungsten matrix with 20% porosity is infiltrated with silver. Assuming that the pores are interconnected, what is the density

daser333 [38]

Answer:

15.4 g/cm³, 17.4 g/cm³

Explanation:

The densities can be calculated using the formula below

ρ = (fraction of tungsten × ρt ( density of tungsten)) + (fraction of pores × ρp( density of pore)

fraction of tungsten = (100 - 20 ) % = 80 / 100 = 0.8

a) density of the before infiltration = ( 0.8 × 19.25) + (0.2 × 0) = 15.4 g/cm³

b) density after infiltration with silver

fraction occupied by silver = 20 / 100 = 0.2

density after infiltration with silver = ( 0.8 × 19.25) + (0.2 × 10) = 17.4 g/cm³

5 0

3 years ago

Three masses are attached to a uniform meter stick, as shown in Figure 12.9. The mass of the meter

sp2606 [1]

At equilibrium, the sum of clockwise and anticlockwise moments about a point is zero

The mass of that balances the system is $\underline {316.\overline 6}$ kg

The normal reaction force at the fulcrum is <u>5,804.25 N</u>

Rason:

The mass of the stick = 150.0 g

Mass m₁ on the left = 50.0 g, location = 30 cm to the left of m₂

Mass m₂ on the left = 75.0 g, location = 40 cm to the left of the fulcrum

Mass m₃ on the right of the fulcrum. location = 30 cm to the right of the fulcrum

Required:

To find the mass of m₃

Solution:

Taking moment about the fulcrum, we have;

50 × (30 + 40) + 75 × (40) + 150 × 20 = m₃ × 30

9,500 = m₃×30

$m_3 = \dfrac{9,500}{30} = 316. \overline 6$

The mass of that balances the system when it is attached at the right end of the stick, m₃ = $316.\overline 6$ kg

Normal reaction at the fulcrum = (50 + 75 + 150 + $316.\overline 6$ ) × 9.81 = 5804.25

The normal reaction at the fulcrum is 5,804.25 N

Learn more about the moment of a force here:

brainly.com/question/19464450

8 0

2 years ago

he Animal Insurance Company:Writes a program that repeatedly prints the insurance fee to pay for a pet according to the followin

nordsb [41]

Answer:

Program code is given below.

Explanation:

#include <iostream>

using namespace std;03

int main()

{

char neutered, opselect, animal;

const int dogcost = 80, catcost = 60, birdOrReptilecost = 0;

cout << "What kind of animal do you have?\n";

cout << "d for dog, c for cat, b for bird or reptile and o for others.\n\n";

cin >> animal;

cout << "Answer the following questions\n";

cout << "With Y for yes or N for no.\n\n";

cout << "Is your pet neutered? ";

cin >> neutered;

cout << "Enter a select code: ";

cout << "\n1)A dog that has been neutered: ";

cout << "\n2)A dog that has not been neutered: ";

cout << "\n3)A cat that has been neutered costs: ";

cout << "\n4)A cat that has not been neutered costs: ";

cout << "\n5)A bird or reptile: ";

cin >> opselect;

switch (opselect)

{

case 1:

cout << "The price for dog that has been neutered is " << dogcost - 30;

break;

case 2:

cout << "The price for dog that has not been neutered is " << dogcost << endl;

break;

case 3:

cout << "The price for cat that has been neutered is " << catcost - 20 << endl;

break

case 4:

cout << "The price for cat that has not been neutered is " << catcost << endl;

break;

case 5:

cout << "The price for bird or reptile is " << birdOrReptilecost << endl;

break;

return 0;

}

4 0

3 years ago