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3 years ago

Develop an E-R model (E-R Diagram) for the application belowDatabase RequirementsLogin

Engineering

1 answer:

nikklg [1K]3 years ago

4 0

Answer:

As the ER diagram is to be drawn in some tool so it is attached as snapshot i have taken from my tool.

Explanation:

Please find snapshot below for detailed ER diagram.

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Why is a universal joint useful?

zubka84 [21]

Answer:

the are useful because they transmit a rotary motion they are used in shafts like the driveshaft in a car

Explanation:

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4 years ago

If an elevator repairer observes that cables begin to fray after 15 years, what process might he or she use to create a maintena

otez555 [7]

Answer:

inductive reasoning

Explanation:

Inductive reasoning is one of the type of reasoning method in which generalized consequences are derived from limited observations. By observing few data, general conclusions are drawn. The conclusions drawn are false in inductive reasoning. In the given situation, the conclusion drawn by the elevator repairer has been drawn by inductive reasoning. His observation of some cables led him to draw the conclusion about all the cables. The result of the reasoning is false.

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3 years ago

Is it a problem that the stress intensity factor, K, from Irwin's near-tip approximation approaches infinity as you get close to

valina [46]

Answer:

No it is not a problem

Explanation:

It is not a problem because the stress intensity factor K would approach infinity as you get close to a crack tip and the intensity factor would approach Zero as you get too far away from the crack tip and this is simply because a crack is a notch with zero tip radius .

and The application of stress intensity factor k in respect to present fatigue crack tip is termed " linear elastic fracture mechanics "

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3 years ago

An inductor is energized as in the circuit of Fig. 2-4a. The circuit has L 10 mH and VCC 14 V. (a) Determine the required on tim

Savatey [412]

Answer:

A) 11.1 ms

B) 5.62 Ω

Explanation:

L ( inductance ) = 10 mH

Vcc = 14V

<u>A) determine the required on time of the switch such that the peak energy stored in the inductor is 1.2J </u>

first calculate for the current ( i ) using the equation for energy stored in an inductor hence

i = $\sqrt{\frac{2W}{L} }$ ----- ( 1 )

where : W = 1.2j , L = 10 mH

Input values into equation 1

i = 15.49 A

Now determine the time required with expression below

i( t ) = 15.49 A

L = 10 mH, Vcc = 14

hence the time required ( T-on ) = 11.1 ms

attached below is detailed solution

B) <u>select the value of R such that switching cycle can be repeated every 20 ms </u>

using the expression below

τ = $\frac{L}{R}$ ---- ( 2 )

but first we will determine the value of τ

τ = t-off / 5 time constants

= (20 - 11.1 ) / 5 = 1.78 ms

Back to equation 2

R = L / τ

= (10 * 10^-3) / (1.78 * 10^-3)

= 5.62 Ω

3 0

3 years ago

Air, at a pressure of 700 kPa and a temperature of 80°C, flows through a convergent– divergent nozzle. The inlet area is 0.005 m

vodomira [7]

Answer: The complete part of the question is to find the exit velocity

Explanation:

Given the following parameters

Inlet pressure = 700kpa

outlet pressure = 40kpa

Temperature = 80°C = 353k

mass flow rate = 1 kg/s

The application of the continuity and the bernoulli's equation is employed to solve the problem.

The detailed steps and the appropriate formula is as shown in the attached file.

7 0

4 years ago