1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Nina [5.8K]
2 years ago
8

What variable does each of the symbols in the equation represent?

Physics
1 answer:
taurus [48]2 years ago
4 0

Answer:

Pls give the equation and for what is that equation for?

You might be interested in
A 310-km-long high-voltage transmission line 2.00 cm in diameter carries a steady current of 1,010 A. If the conductor is copper
Marizza181 [45]

Answer:

t = 166 years

Explanation:

In order to calculate the amount of years that electrons take to cross the complete transmission line. You first calculate the drift speed of the electrons by using the following formula:

v_d=\frac{I}{nqA}             (1)

I: current on the wire = 1,010A

n: free charge density = 8.50*10^28 electrons/m^3

A: cross-sectional area of the transmission line = π*r^2

r: radius of the cross-sectional area = 2.00cm = 0.02m

You replace the values of the parameters in the equation (1):

v_d=\frac{1,010A}{(8.50*10^{28}electron/m^3)(1.6*10^{-19}C)(\pi (0.02m)^2)}\\\\v_d=5.9*10^{-5}\frac{m}{s}

Next, you use the following formula:

t=\frac{x}{v_d}                     (2)

x: length of the line transmission = 310km = 310,000m

You replace the values of vd and x in the equation (2):

t=\frac{310,000m}{5.9*10^{-5}m/s}=5.24*10^9s

Finally, you convert the obtained t to seconds

t=5.24*10^9s*\frac{1\ year}{3.156*10^7s}=166.03\ years

The electrons take approximately 166 years to travel trough the complete transmission line

5 0
3 years ago
A person approaches a flat mirror at a speed of 0.25 m / s. How fast is he approaching his image?
Bezzdna [24]
  • Flat mirror is given here
  • We know that in a flat mirror the distance of object from the mirror is equal to distance of image from the mirror i.e v=u
  • Only the side of image changes ime left is seemed right.

So the speed remains same 0.25m/s.

3 0
2 years ago
PLEASE HELPPPPP!!Calculate the net force acting on obiect A. In your answer, be sure to include the number, unit, and
asambeis [7]

Answer:

4 N to the right

Explanation:

For the object in this problem, we have 2 forces acting on it:

- A force of 2 N, to the right

- A force of 2 N, to the right

The two forces are in line: this means that the two vectors can be simply added by calculating their algebraic sum.

If we take right as positive direction, the two forces can be written as

F1 = +2 N

F2 = +2 N

So, the net force will be

F=F_1+F_2=+2+2=+4 N

And the positive sign means the direction is to the right.

6 0
3 years ago
Light travels _____________ in a material with a higher index of refraction.
Aleks [24]
<span>Light travels Slower  in a material with a higher index of refraction.
because </span><span>Water has a higher index of refraction than air and it travels slower (bends) in water
high index mean slow travel
hope it helps</span>
4 0
2 years ago
Read 2 more answers
What is it called when data are arranged in rows and columns?
Tpy6a [65]

Answer:

C. Table

<h2>What is a Database table?</h2>

A organized collection of records is called a database table. The main key that uniquely identifies each row in the table. Since no two rows may have the same instantaneous value thanks to a unique key, it is simple to choose a row by its main key. A table can also contain several columns, each of which can hold a distinct kind of data. The information stored is verified using the column name and data type.  

The table name is the linguistic component of a database table. It can represent expressions or variable items, and it must be typed exactly. Square brackets denote a need for the item, whereas curly braces denote an optional element. An alternate choice is indicated by a vertical bar. A main key is a single field, and a secondary key might be a combination of many fields. This kind of information is crucial.

Any field in the data table can be referenced by the secondary key. A database's data field may be a string, a number, a date, or a time. A table's first field should always be the main key, followed by any foreign keys. Actual data should never be present in a primary key. Since the immediate key value is derived from external sources, it is crucial to use it properly. Otherwise, data input mistakes may occur.

The information kept in the database table is referred to as a secondary key. This kind is a primary key, which implies it is a secondary key. A primary key can be used as an alternate key to distinguish between different records in a table and to uniquely identify a record inside a database. Multiple fields that can be either main or alternative make up a composite key.

Depending on the type of data being stored and its intended use, a database table may have a single row or several. The main key determines the number of rows, which might be 50 or more. A secondary key can be used to establish connections between various tables and to distinguish between various data types in a database. A data table also includes a secondary key, which is essential for data retrieval and is separate from the primary key.

You can have local or global database tables. The two types of tables differ in terms of names, availability, and visibility. A global table is accessible to all users and may be utilized by any other user, while a local table is only visible to the present user. It is distinct from a typical table and requires more effort to build than a straightforward one does. Its main function is to maintain a database and store data.

Rows in a database table can be of any size. A table's rows can include any number of columns. A database table's rows can be arranged in any way. The number of rows on a data page might range from one to thousands. Each row may consist of a clustered index, a row, or both. A list of columns may also be present in a row. A clustered index can only contain information in a particular sequence.

A table can be set up in  two different ways. The information-containing row of data is its main key. The data column that contains the values for a row is known as a secondary key. A database that employs rows is the third form of table. Multiple primary keys are possible for a data row, and a secondary key is a secondary key that refers to a row column. A database will have a foreign key if it is formed with a single primary key.

There is no limit to the amount of rows and columns in a database table. Up to 1,024 rows are allowed in a typical user-defined table. The server's storage capacity determines how many rows can fit in a database table. A table can have characteristics added to it in addition to the column and row. A restriction can stop a row from having empty fields. The connection between two tables can be established via an important control.

8 0
2 years ago
Read 2 more answers
Other questions:
  • Which of the following illustrations show atoms of the same element?
    6·1 answer
  • Which item has the most potential energy (assume they are all at the same height and mass
    9·2 answers
  • Mrs. Smith does her daily chores. She walks 5 m to the laundry room and then turns around and walks -14 m to the kitchen. The wh
    7·1 answer
  • A hedgehog runs 500 meters in 10 minutes, then 300 meters in 8 minutes and finally 100 meters in 6 minutes. What is the hedgehog
    14·1 answer
  • A racing car has a mass of 1525kg. What is its kinetic energy if it has a speed of 108km/h
    7·1 answer
  • Consider a stone and a football both at rest and having the same mass. why is it painful to kick the stone than to kick the foot
    8·1 answer
  • The ground receives more light (heat) from the sun when:
    11·1 answer
  • A simple harmonic transverse wave is propagating along a string towards the left direction as shown in the figure. figure shows
    10·1 answer
  • Which of the following is NOT a human blood type?
    10·2 answers
  • What is an example of a reservoir?<br> 1. Beach<br> 2. Cloud<br> 3. Desert<br> 4. Lake
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!