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Answer:

Explanation:

5x + y = 7

20x - y = -2

    25x = 5

        x = (1/5)

5(1/5) + y = 7

1 + y = 7 .

y = 6

system of equations  5x+y=7, 20x+2=y

is  [tex]x=\frac{1}{5} \\y=6[/tex]

Therefore,

Calculation

[tex]5x+y=7.............(i)\\20x+2=y..........(ii)[/tex]

adding equations (i) and (ii)

⇒[tex]5x+y=7-(20x-y=-2)[/tex]

⇒[tex]25x=5[/tex]

⇒[tex]x=\frac{1}{5}[/tex]

putting the value of x in equation (i), we get

⇒[tex]5[/tex]×[tex]\frac{1}{5}+y=7[/tex]

⇒[tex]y=7-1[/tex]

⇒[tex]y=6[/tex]

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Answer:

Explanation:

3. The word circuit means "go around", therefore a circuit is a pathway or closed path around which electricity (or water) flows.

4. Electrons flowing through a wire can be compared to water flowing through a hose. Once the flow of electrons or water is going, work, is performed.

5. You would get shocked in a bumper car by touching the floor and the ceiling at the same time. This means you are completing the circuit allowing electricity to flow.

6. Electricity from a wall outlet has enough energy to stop your heart.

7. Electricity is the flow of electrons, because electrons move or jump from atom to atom.

8. Materials that allow electrons to move easily from atom to atom are called conductors.

9. Materials that do not allow electrons to flow easily are called insulators.

10. Semi- conductors are materials that are somewhere in between .

11. Voltage is the force or pressure of electricity and is compared to the amount of water pressure in a hose.

12. Current (amps ) is the amount of electricity and is compared to the amount of water in a hose .

13. Watts (power) is the term for work performed by electricity.

Answer: An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space.

Explanation: The parts of a circut bit can easily be found online, but heres a pic i found.

Answer:

is about something failing down

it is a water

Explanation:

it falls after the clouds are full from either evaporation or transportation in the water cycle but do not drink it, it is very dirty and bad for you

Explanation:

fossil and glaciers is the to pieces of evidence

Answer:

B .

Explanation:

Elastic potential energy stored in a spring is given by;

E=1/2*k*{Δl}²  where

k= spring constant

Δl = change is length of spring

if k is different the energy stored in the system is different. This is true also in the case where Δl is different.

For a parallel system, springs help each other to carry the weight. The stiffness doubles up to mean ;

k parallel =2k

and

Δl parallel = 1/2 Δl

so;

E in one spring = 1/2*k*{Δl}²----------{a}

Using {a} this in the parallel system;

E parallel = 1/2 * 2k * {1/2Δl}²

                = 1/2 * 2* k* 1/4 *{Δl}²

                = 1/2 E in one spring

Answer : Ep / 2

Answer:

what do you need helo with

Answer: Your answer is 1250J

Explanation:

K E = 1/2 m v 2

The mass is  

m = 25 k g

The velocity is  v = 10 m s − 1

So,

K E = 1 /2 x25 x 10 2^2= 1250 J

pls mark brainiest answer  

Answer:

20 kg

Explanation:

Mass equals force divided by acceleration, so divide 100 N by 5 m/s2 and you get your mass: 20 kg

Answer: m= 20 kg

Explanation: Use the formula

F = m a

to solve this.

100 N = m (5 m/s²)

100 N / (5 m/s²) = m

20 kg = m

(N is also kgm/s², so when you divide by m/s², you are left with kg.)

Answer:

For equilibrium the net torque on the rod must be zero. So the 100N forces should on either side of the pivot point i.e. one on the left and one the right, and in same direction.

Answer:

An object is moving across a surface, but it does not gain or lose speed, the object's net force is zero.

Explanation: The net force means the vector sum of all the forces acting on an object

Answer:

well its not C

Explanation:

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 69 × 2

We have the final answer as

Hope this helps you

Answer:

yoo yoo

24

Explanation:

Answer:

Gravity. An object is moving across a surface, but it does not gain or lose speed.

Explanation:

The basic idea. Physicists see gravity as one of the four fundamental forces that govern the universe, alongside electromagnetism and the strong and weak nuclear forces.

Hope it helps! Brainliest?

Answer:

Photons have no mass, they do have energy, and the gravity of a black hole (or any other gravitating body) will attract them.

Explanation:

is that what you wanted?

Answer:

number one use carbon 14

Explanation:

Answer:

A

Explanation:

Carbon-14 testing of organic material such as wood can approximate the age by measuring the radioactive decay rate of the carbon-14 in the wood. From that a baseline for the trees age can be established and the ring patterns can by applied to a time period.

Answer:

Lava dome

Explanation:

A geyser is hot water being shot up from the ground

A newly formed island would be somewhere on the ground not directly above  a volcano (Well depending on where the volcano is anyways)

A flood basalt plateau is like rocks I think?

Answer:

A on edge 2020

Explanation:

Answer:

a.  convey different messages.

Explanation:

Got it on edge just took the test.

Answer:

aceleration doubles

Explanation:

From Newton's secon law, one has

F=m*a

where F is the force, m the mass and a the aceleration.

In general, if m becomes m/2, in order to have the same force,

the acceleration must be doubled:

[tex]F=m*a=\frac{m}{2} (2*a)[/tex]

In our particular case,

[tex]12=6*a=\frac{6}{2} (2*a)\\12=3(2*a)[/tex]

Answer:

Nuclear fission creates heat!!

Explanation:

Reactors use uranium for nuclear fuel. The uranium is processed into small ceramic pellets and stacked together into sealed metal tubes called fuel rods. Typically more than 200 of these rods are bundled together to form a fuel assembly!

P.S. You can search this up!

- Hope this helped you!! :D

As the shape of a molecule has a lot to do with the polarity of the compound, the molecular structure influences the molecular properties. Polar compounds tend to dissolve in polar compounds, forming solids or liquids with higher boiling and melting points.

A physical property is a property of matter that is unrelated to changes in its chemical composition. Density, color, hardness, melting and boiling points, and electrical conductivity are all examples of physical properties.

In the solid state, the structure determines how individual polymer molecules can orient. As a result, physical properties such as density, crystallinity, melting point, and strength are affected.

Intermolecular forces - forces that attract one molecule to its neighbors - van der Waals attractions or hydrogen bonds - govern physical properties.

Because the intermolecular forces of attraction are relatively weak, molecular substances tend to be gases, liquids, or low melting point solids.

Thus, this way the molecular structure of a material influence its physical properties.

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Resistors & Notations In Series In Parallel

A, B A + B A | B

A, B, C, D A+B+C+D A | B | C | D

In Combination Example A | B | ( C + D ) A | B | ( C + D )

Dec 1 2020

Answer:

solid to gas or gas to liquid

Explanation:

welcome

Answer:

solid to gas or gas to liquid

Explanation:

Edge

Answer:

C. the production of new machines as a result of processes using science and knowledge.

Explanation:

Technology is the application of scientific research and knowledge .

Answer:

Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion.  It also has a high boiling point which makes it very suitable to measure higher temperatures. Also, it has a shiny appearance and doesn't stick to the glass surface of glass.

Explanation:

Answer:

kenitec energy

Explanation:

because kinetic and mass have same

Answer:

Explanation:

The kinetic energy of the toy car can be found by using the formula

[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]

m is the mass

v is the velocity

From the question we have

[tex] k = \frac{1}{2} \times 2 \times {5}^{2} \\ = 1 \times {5}^{2} [/tex]

We have the final answer as

Hope this helps you

Answer:

1.75 is the unit rate so yeah