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Gala2k [10]
4 years ago
15

2 times 4 - 3 times 5​

Engineering
2 answers:
Serjik [45]4 years ago
8 0

<em>2</em><em>(</em> <em>4</em><em>)</em><em> </em>-<em> </em><em>3</em><em>(</em><em>5</em><em>)</em><em> </em><em>=</em>

<em>8</em><em>-</em><em>1</em><em>5</em><em> </em>

<em>is</em><em> </em><em>equ</em><em>al</em><em> to</em><em> </em><em>7</em>

Papessa [141]4 years ago
4 0

Answer:

<h3>The answer is - 7</h3>

Explanation:

The statement above is written as

2 × 4 - 3 × 5

8 - 15

= - 7

Hope this helps you

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While walking across campus one windy day, an engineering student speculates about using an umbrella as a "sail" to propel a bic
makvit [3.9K]

Answer:

Given data:\\While walking across campus one windy day\\Frontal area, \(A=0.3 m ^{2}\)\\Wind speed \(V=24 Km / hr\)\\The drag coefficient \(C_{D, b}=1.2\)\\The combined mass \(m=75 kg\)\\Umbrella diameter, \(D=1.22 m\)\\Velocity of wind \(V=24 \frac{ km }{ hr }\)\\The rolling resistance \(C_{R}=0.75 \%\)

Solution:

Note: Refer the diagram

Basic equation:\\'s law of motion: \(\sum F_{x}=m a_{x}\)\\Lift coefficient, \(C_{L}=\frac{F_{L}}{\frac{1}{2} \rho V^{2} A_{p}}\)\\Drag coefficient, \(C_{D}=\frac{F_{D}}{\frac{1}{2} \rho V^{2} A_{p}}\)

From force balance equation:\\\(\sum F_{x}=F_{D}-F_{R}=0\)\\But \(F_{D}=\left(C_{D, \alpha} A_{u}+C_{D, B} A_{b}\right) \frac{1}{2} \rho\left(V_{\nu}-V_{b}\right)^{2}\)\(F_{R}=C_{R} m g\)\\Area of the Umbrella \(A_{u}=\frac{\pi D_{u}^{2}}{4}\)\(A_{x}=\frac{\pi \times 1.22^{2}}{4} m ^{2}\)\(A_{v}=1.17 m ^{2}\)

Drag coefficient data for selected objects table at

Hemisphere (open end facing flow), C_{D, x}=1.42

Substituting all parameters,

\begin{aligned}&F_{R}=0.0075 \times 75 \times 9.81\\&F_{R}=5.52 N\end{aligned}

Then,

\begin{aligned}&V_{b}=V_{w}-\left[\frac{2 F_{R}}{\rho\left(C_{D, w} A_{w}+C_{D, B} A_{b}\right)}\right]^{\frac{1}{2}} \dots\\&V_{w}=24 \times 1000 \times \frac{1}{3600}\\&V_{w}=6.67 \frac{ m }{ s }\end{aligned}

And the equation becomes,

\begin{aligned}&V_{b}=6.67-\left[\frac{2 \times 5.52}{1.23(1.42 \times 1.17+1.2 \times 0.3)}\right]^{\frac{1}{2}}\\&V_{b}=6.67-2.11\\&V_{b}=4.56 \frac{ m }{ s }\end{aligned}

Thus the floyds travels at 68.3^{\circ}wind speed.

7 0
4 years ago
Who is the worst clown in rouge linage
Lerok [7]
All of them
explanation:
you don’t need one
4 0
3 years ago
A 1:50 scale model of a ship is towed at 4.8 km/hr using a force of 9 N. If we assume the same fluid in the model as in the prot
Mashutka [201]

Answer:

A: density and gravity

Explanation:

The Froude Number is defined as a dimensionless parameter that measures the ratio of the force of inertia on an element of fluid to the weight of the fluid element. In simple terms, it's the force of inertia divided by the gravitational force.

Froudes number is usually expressed as;

Fr = v/√(gd)

Where;

Fr = froude number

v = velocity

g = gravitational acceleration = specific weight/density

d = depth of flow

Now, to calculate the corresponding speed and force in the prototype, it means we have to use equal froude number and thus this will mean that it has to be dominated by gravity and density.

4 0
3 years ago
How code sould I use to make a robtic arm move
ahrayia [7]
You may have to do your research online for this.
8 0
4 years ago
Read 2 more answers
Energy process consistent with the conservation of energy and conservation of mass principles can actually occur in nature. a)-T
Ksivusya [100]

Answer:

True

Explanation:

in a lightning for example we can see energy flowing in the environment.

The most easy way of seeing this is with the evaporation of the water in the sea because of the energy coming from the sun, the energy is used to change the state of the matter in water, changing it from liquid to gas. The energy is conservated and used for the environment.

7 0
3 years ago
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