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pishuonlain [190]
2 years ago
8

, dx" alt="\int\limits^a_b {7x} \, dx" align="absmiddle" class="latex-formula">
Engineering
1 answer:
Dafna11 [192]2 years ago
5 0

Answer:

\frac{7}{2}a^2 - \frac{7}{2}b^2

Explanation:

\int\limits^a_b {7x} \, dx

=[\frac{7}{2}x^2]^a_b

=\frac{7}{2}a^2 - \frac{7}{2}b^2

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Tanya Pierce, President and owner of Florida Now Real Estate is seeking your assistance in designing a database for her business
const2013 [10]

Answer:

the answer is attributes for each entity

5 0
3 years ago
Five kilograms of air at 427°C and 600 kPa are contained in a piston–cylinder device. The air expands adiabatically until the pr
son4ous [18]

Answer:

The entropy change of the air is 0.240kJ/kgK

Explanation:

T_{1} =427+273K,T_{1} =700K\\P_{1} =600kPa\\P_{2} =100kPa

T_{2}  is unknown

we can apply the following expression to find T_{2}

-w_{out} =mc_{v} (T_{2} -T_{1} )

T_{2} =T_{1} -\frac{w_{out } }{mc_{v} }

now substitute

T_{2} =700K-\frac{600kJ}{5kg*0.718kJ/kgK} \\T_{2}=533K

To find entropy change of the air we can apply the ideal gas relationship

Δs_{air}=c_{p} ln\frac{T_{2} }{T_{1} } -Rln\frac{P_{2} }{P_{1} }

Δs_{air} =1.005*ln(\frac{533}{700})-0.287* in(\frac{100}{600} )

Δs_{air} =0.240kJ/kgK

4 0
2 years ago
Su prepares a presentation about the industrial revolution. She wants to change the font on the second slide of her presentation
choli [55]

Font of the slide can be edited in the presentations :-

Explanation

By following these steps Su can change the presentation font of her second slide.

1. Edit- As Su open her second slide , there will be a option of "Edit" on the top right corner of the screen.

2. Font- As the various options are available on the screen such as  font size , add image etc ,click on the option "Font"

3. Drop Down- As you click on font option , it will be followed by a drop down option with various type of fonts. Su can select the font she wishes to add in her presentation and look it more precise by adjusting the Font Size.

4 Save- Save the changes made in the slide for future.        

8 0
2 years ago
An important concept to aid understanding of electromagnetics is electrical length. Electrical _________ is a unitless measure t
kondor19780726 [428]

Answer: Electrical length is a unitless measure that refers to the length of a wire or device at a certain frquency. It is defined as the ratio of the physical length of the device to the wavelength of the signal frequency.

Explanation:

In nature, the maximum speed achievable for any interaction or perturbation along a medium (like a wire) can't be higher than the speed of light, otherwise it would be violating Einstein's Relativity Theory.

So, in a given circuit, the voltage and current aren't set up instantaneously, and a finite time exists since a battery is connected to a circuit till a stable current  traverses a load resistor connected to it.

Now, the electrical length, defines how important in is this delay, in the calculation of the voltage through the resistor, for instance.

We can write the electrical length (L.E.) as follows:

L.E. = L / (v/f) = L / λ

As we can see, the effect depends not only on the circuit dimensions, but the frequency of the signal as well.

If L.E. is much smaller than λ, this means that we can neglect the effects of the delay, and we can use the circuit theory, namely KVL, KCL and Ohm's law to analyze the circuit, assuming that the current establishes instantaneously.

Otherwise, the current and voltage concepts are not valid anymore, as we need to think in terms of propagation of electromagnetic waves, like in transmission lines and antennas.

Roughly, if L.E. ≤ 20 λ, we say that we are still in the realm of the circuit theory.

3 0
2 years ago
Engineer drawing:<br> How can i draw this? Any simple way?
Anastasy [175]
Make 4 triangles left right up down and they must be connected with no gaps then make more triangles into the triangle about three times for each of them then add rectangles or lines to the drawing
6 0
3 years ago
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