TRUE OR FALSE! HELP!!

Select the correct answer

DIA [1.3K]

Answer:

b

Explanation:

scan the images with 72DPI

5 0

3 years ago

Write the printItem() method for the base class. Sample output for below program:

Anna [14]

Answer:

The printItem() method code is filled in the explanation, highlighted with bold font.

Explanation:

// ===== Code from file BaseItem.java =====

public class BaseItem {

protected String lastName;

public void setLastName(String providedName) {

lastName = providedName;

return;

}

// FIXME: Define printItem() method

/* Your solution goes here */

public void printItem() {

// TODO Auto-generated method stub

System.out.println("Last name: "+lastName);

}

// ===== end =====

4 0

3 years ago

If a star system 30 parsecs distant is found to be broadcasting intelligent radio signals, then their news is already approximat

IrinaK [193]

Answer:

97.85 years, approximately.

Explanation:

Light travels at a constant speed of 186,000 mi/seg or 300,000km/seg accross the Universe (in vacuum conditions). Radio waves are also part of the electromagnetic spectrum, and they also travel at the same speed as Light does.

A light-year is a measure of the distance that Light travels during a year, that is, 5.88 trillion miles. Light travels the same distance per year because its speed is constant, and this is an excellent property that scientists take advantage to measure distances.

A parsec is 3.26 light-years (19 trillion miles), and (a very important datum to solve this question) one light-year is 0.306601 parsec, that is, in a year Light travels 0.306601 parsec at a constant speed. The same would happen with intelligent radio signals broadcasted from a distant star system.

So, considering all these facts, it is a matter of proportions to solve this question (mostly because speed of Light is constant):

$\frac{1 year}{0.306601 parsec} = \frac{X years}{30 parsecs}$

$x =\frac{1 year * 30 parsec}{0.306601 parsec}$

$x = \frac{30}{0.306601} years$

x = 97.84704 years or,

x = 97.85 years, approximately.

In other words, Light spends 97.85 years (terrestials) to travel 30 parsecs.

Likewise, radio waves travel at the same speed, so they spend the same years (97.85 years) travelling across the Universe to be finally detected by a radiotelescope located, for instance, here, in our planet.

Finally, the star system broadcasted intelligent radio signal with 'news' that are already approximately 97.85 years old'.

6 0

3 years ago

Convert the decimal number -17 to binary (2's complement)

Katarina [22]

Answer:

1111111111101111

Explanation:

The binary representation of 17 is 0000000000010001.

In order to get the binary representation of -17 we need to calculate the 2's complement of 0000000000010001.

Step 1 : 1s complement of 0000000000010001 = 1111111111101110

Step 2 : 2s complement => 1111111111101110 + 1 = 1111111111101111

This actually corresponds to the negative of the original number which was 17.

So the 2s complement representation of -17 is 1111111111101111 .

6 0

4 years ago

The format for the UPDATE command is the word UPDATE, followed by the name of the table to be updated. The next portion of the c

fenix001 [56]

The format for the UPDATE command is the word UPDATE, followed by the name of the table to be updated. The next portion of the command consists of the word SET, followed by the name of the column to be updated, an equals sign, and the new value.

Explanation:

An Update Query is an action query (SQL statement) that changes a set of records according to criteria you specify.
The SQL UPDATE Query is used to modify the existing records in a table. You can use the WHERE clause with the UPDATE query to update the selected rows, otherwise all the rows would be affected.
Update Queries let you modify the values of a field or fields in a table.

UPDATE Syntax 

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

UPDATE table_name SET column1 = value1, column2 = value2, etc WHERE condition;

table_name: name of the table
column1: name of first , second, third column....
value1: new value for first, second, third column....
condition: condition to select the rows for which the
values of columns needs to be updated.

8 0

4 years ago