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2 years ago

Which of the following is not a relationship set between elements in a sketch

Engineering

1 answer:

Svet_ta [14]2 years ago

6 0

Answer:

The entity relationship (ER) data model has existed for over 35 years. It is well suited to data modelling for use with databases because it is fairly abstract and is easy to discuss and explain. ER models are readily translated to relations. ER models, also called an ER schema, are represented by ER diagrams.

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To 3 significant digits, what is the change of entropy of air in kJ/kgk if the pressure is decreased from 400 to 300 kPa and the

Levart [38]

Answer:

The change of entropy is 1.229 kJ/(kg K)

Explanation:

Data

$T_1 = 300 K$

$T_2 = 900 K$

$p_1= 400 kPa$

$p_2= 300 kPa$

$R= 0.287 kJ/(kg K)$ (Individual Gas Constant for air)

For variable specific heats

$s(T_2, p_2) - s(T_1, p_1) = s^0(T_2) - s^0(T_1) - R \, ln \frac{p_2}{p_1}$

where $s^0(T)$ is evaluated from table attached

$s^0(900 K) = 2.84856 kJ/(kg K)$

$s^0(300 K) = 1.70203 kJ/(kg K)$

Replacing in equation

$s(900 K, 300 kPa) - s(300 K, 400 kPa) = 2.84856 kJ/(kg K) - 1.70203 kJ/(kg K) - 0.287 kJ/(kg K) \, ln \frac{300 kPa}{400 kPa}$

$s(900 K, 300 kPa) - s(300 K, 400 kPa) = 1.229 kJ/(kg K)$

5 0

3 years ago

A parallel circuit has a resistance of 280 and an inductive reactance of 360 02. What's this circuit's impedance?

Doss [256]

Answer:

540 W

Explanation:

4 0

3 years ago

Let suppose, you are going to develop a web-application for school management system. Then what architectural pattern will you u

Gnesinka [82]

Answer:

The architectural pattern i will use for the school management is the client-server pattern.

This pattern would consist of a server and many clients. wherein the server component would provide services to that of the clients and its components as specified and also there would be a client request service from that of the server.

Explanation:

Solution

A school management system would always involve the client server pattern as this pattern would have a server and many clients wherein the server component would give services to that of the clients and its components as specified and also there would be a client request service from that of the server. This server would share the appropriate services to such clients and also listen to the client's requests.

Such kind of pattern would mostly be used for for the online platforms or application like that of document.

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3 years ago

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almond37 [142]

Answer:

Explanation:

4 0

3 years ago

Read 2 more answers

A masonry facade consisting of 3,800 square feet is to be constructed for a building. The total cost per worker hour is estimate

lana66690 [7]

Answer:

Days: 6.9444 days

Production rate: 547.2035 ft²/s

Explanation:

the solution is attached in the Word file

Download docx

6 0

3 years ago

Which of the following is not a relationship set between elements in a sketch​

Which of the following is not a relationship set between elements in a sketch