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3 years ago

write an interface downloadable that has a method "geturl" that returns the url of a downloadable object

Engineering

1 answer:

Scrat [10]3 years ago

3 0

Answer:

I want to believe the program is to be written in java and i hope your question is complete. The code is in the explanation section below

Explanation:

import java.util.Date;

public interface Downloadable {

//abstract methods

public String getUrl();

public Date getLastDownloadDate();

}

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3 years ago

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VMariaS [17]

Answer:

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Explanation:

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3 years ago

The variation of the pressure of a fluid with density at constant temperature is known as the _____.

qaws [65]

The variation of the pressure of a fluid with density at constant temperature is known as the coefficient of compressibility.

<h3>What is a compressor?</h3>

A compressor can be defined as a mechanical device that is designed and developed to provide power to refrigerators, air conditioners, and other heating or cooling mechanical devices (engines), especially by increasing the pressure on air or other applicable gases.

In an isothermal process, the coefficient of compressibility is also known as isothermal compressibility or compressibility and it refers to a measure of the variation of the pressure and relative volume of a fluid with density at constant temperature.

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2 years ago

A market research survey has 15 questions and will be sent to 500 people. What is the total cost to conduct survey if it has a $

Dimas [21]

Answer:

$39,500

Explanation:

In order to find the total cost, we proceed as follows:

First, the base fee is:

$b=\$1000$

Then we calculate the total number of questions: we have 15 questions per survey, and a total of 500 surveys (for 500 people), therefore the total number of questions is

$Q=15\cdot 500 =7500$

Since the cost is $5 per question, the total cost of the questions is

$q=\$5\cdot 7500 =\$37,500$

Finally, we have 500 persons, and there is a cost of $2 per each person, so the cost due to this is

$p=\$2\cdot 500 = \$1000$

Therefore, the total cost is:

$T=b+q+p=1000+37,500+1000=\$39,500$

8 0

4 years ago

use engineering judgement to estimate the size of cooling and heating equipment that is needed for a three story, 31,000 square

Blizzard [7]

Answer: operating cost = 22820.736 $

Energy = 32.291 KBtu/sf.

Explanation:

Total heating load is given as = 31000 * 31.25

= 968.75* 103 Btu

From the cooling capacity application;

If 1000ftsquare = 2.8 TR

Therefore 30000ftsquare = x

Where x is the total cooling load,

Therefore x = (30000 * 2.8) / 1000

x = 84TR.

Therefore, the total cooling load, x = 84TR

Using conversion factor;

i.e. converting Btu/hr to MBH

1 MBH = 1000 Btu per hour

we have 968.75* 103 Btu/hr = 968.75 MBH

let us proceed.

Estimating the “Annual operating cost” we first calculate the maximum operating cost (Avg/Annum)

For cooling load:

Max. operatn. Cost = 14 * 84 = 1176$

For heating load:

The average heating loading hours = 1000 hrs.

Conversion to Btu/yr gives = 968.75* 103 * 1000

= 968.75* 106 Btu/yr.

Conversion of 968.75* 103Btu to Kwh gives

1Btu = 0.000293

968.75* 103 Btu = 283.84 Kwh

Therefore, average cost gives;

(8.04/100) $ = 1Kwh

X = 283.84*103

X = 22820.736 $

Operating cost = 22820.736 $

Energy use in KBtu/sf is given as

E = 968.75* 103 / 30000

E = 32.291 KBtu/sf.

8 0

4 years ago