cho hình vuông ABCD, tại A và C đặt các điện tích q1=q3=q. Hỏi phải đặt ở B một điện tích bằng bao nhiêu để cường độ điện trường bằng 0

Answer:

Below

Explanation:

4. You can use this formula to calculate the acceleration of an object

     acceleration = velocity / elapsed time

Plugging our values in....

     acceleration = 1700 m/s / 25 s

                          = 68 m/s^2

5. You can use this formula to calculate the final velocity of an object

     finalvelocity = initialvelocity + (acceleration) (time)

Plugging our values in....

     finalvelocity = 1.5 m/s + (2.4 m/s^2) ( 3 seconds)

                         = 8.7 m/s

Hope this helps! Best of luck <3

Answer:

a - temperature

b sun ( how things work science)

Answer:

(A)

Explanation:

because they are asking at temperature does water boil they can do experaments to find or they can use science

Explanation:

if the mass of both of the objects is doubled, then the force of gravity between them is quadrupled; and so on.

Answer:

The inquiry process takes advantage of the natural human desire to make sense of the world... This attitude of curiosity permeates the inquiry process and is the fuel that allows it to continue. Process skills are not used for their own sake.

Explanation:

The relative change in length of the edges of a cube are the coef times the change in temperature.

One meter expands to (1 + coef x 100C) = 1.0019 meter

Divide the mass by this number cubed to correct for volume expansion.

10310 kg / 1.00571 = 10251 kg/m3

Using third equation of kinematics

[tex]\\ \rm\longmapsto v^2=u^2+2as[/tex]

[tex]\\ \rm\longmapsto v^2=0^2+2(0.5)(1.6)[/tex]

[tex]\\ \rm\longmapsto v^2=1.6[/tex]

[tex]\\ \rm\longmapsto v=\sqrt{1.6}[/tex]

[tex]\\ \rm\longmapsto v=0.4m/s[/tex]

Now using 1st equation of motion

[tex]\\ \rm\longmapsto v=u+at[/tex]

[tex]\\ \rm\longmapsto t=v-u/a[/tex]

[tex]\\ \rm\longmapsto t=\dfrac{0.4-0}{0.5}[/tex]

[tex]\\ \rm\longmapsto t=\dfrac{4}{5}[/tex]

[tex]\\ \rm\longmapsto t=0.8s[/tex]

Answer:

Using third equation of kinematics

[tex]\begin{gathered}\\ \rm\longmapsto v^2=u^2+2as\end{gathered}[/tex]

⟼v

2

=u

2

+2as

[tex]\begin{gathered}\\ \rm\longmapsto v^2=0^2+2(0.5)(1.6)\end{gathered}[/tex]

⟼v

2

=0

2

+2(0.5)(1.6)

Answer:

0.0054 » two significant figures.

78.0 » three significant figures.

0.09002 » four significant figures.

0.993 » three significant figures.

Explanation:

[tex].[/tex]

The value of a physical quantity is normally expressed as an implied product of a numeric value and a unit of measurement.

There are three categories to consider:

There is no explicit unit of measurement included. Examples of this would include index of refraction of a medium and the specific gravity of a substance (which is ratio of the density of the material divided by the density of some reference material, usually water at some specified temperature). In this category, there is an implied measurement unit of 1 . It is usually not written because 1 times any number is that same number, so it is pointless to write the “times 1”. The value of an index of refraction is simply a number, and that number is all you write for the quantity value. That number is the numerical value of the physical quantity. It is only slightly more complicated for specific gravity, because you are dividing one density by another, and both values should be expressed in the same units of measurement, and the division of one by the other cancels out those units, leaving you with 1 as the overall measurement unit.

For plane angles, there is a relationship between the length s of the arc of a circle, the radius r of that circle, and the angle a subtended by the arc at the circle center:

a = s/r

with the angle a being measured in the unit of radians. (To write the formula for some other angular unit requires incorporating a numeric factor, which is basically a conversion factor from radians to degrees,) Thus, if you have a circle of radius 3 m and an arc of 6 m on that circle, the the angle subtended or formed is:

(6 m)/(3 m) = 2, but we said this is the number of radians, so it is 2 rad.

Notice, we are dividing a length by a length (both the arc length and the radius being lengths), so if we use the same measurement unit for both lengths (regardless that unit being meters, feet, parsecs, or anything else), the two units cancel each other out upon division. This means that the unit we are calling radian is like with specific gravity in #1—it has the value 1. Indeed, we see the formula gives us 2 and we know that it is 2 rad, and the only way we can have them be the same, 2 rad = 2, is if the unit radian is actually just a funny, special name for the number 1. Why do we give the number 1 a special name here, unlike in category #1? That is because some inexperienced people find the concept of radian to be strange and inconvenient. They would rather use degrees, or arcminutes, or arcseconds, or semicircles, or some other such unit, and they all have different sizes. For example, a full circle is 2π rad and it is also 360°. Therefore, since both equal one circle of rotation, they must be equal to each other:

360° = 2π rad. Divide both sides by 360 to get:

1° = (2π/360) rad = (π/180) rad. Now, we saw above that rad = 1, so:

1° = (π/180) rad = (π/180) × 1 = π/180.

Thus, like the radian, the degree is also a number—not 1 though, but rather π/180, which cannot be “thrown away” because π/180 times a number does not yield back the original number.

Thus, 30° = 30 × π/180 = π/6 = π/6 × 1 = π/6 rad.

This is the explanation as to when we express an angle in degrees, we must write the ° symbol or spell out degrees, whereas when we express the angle in radians, we may either explicitly write rad or we may leave it off. Unfortunately secondary school geometry textbooks do not seem to understand this point and typically leave off the mandatory ° symbol. That usually gets straightened out when radians are presented—typically later in the second year of algebra or in trigonometry, but it becomes something necessary for students to unlearn the incorrect and learn the correct. Thus, if an angular unit is included, you can convert that angular unit into a real number and multiply by the numeric part of the physical quantity value to the the numeric value of the physical quantity. (And absence of angular unit implies radians, which have numeric value 1, so the numeric value of the quantity is just the numeric value that is present.

Solid angles work similarly, involving area divided by area. The steradian (sr) is the unit that has value 1.

Answer:

6.68 km

Explanation:

distance = speedxtime

45.8 x 146

6686.6 m

Answer:

d=s

t

d=36

4

d=10m/s

Explanation:

distance is equal to speed over t therefore 36 divide by 4 is 10

Explanation:

I hope it helped U

stay safe stay happy

Answer:

D (density) = Mass / Volume

V (ice) = Mass / Density = 50000 g / .92 kg / L

V = 50 kg / .92 kg / L  

1 Liter of water weighs 1 kilogram = 50 L weighs 50000 g

V = 54.3 L     the mass does not change upon the change of phase (freezing)

Answer:

4

Explanation:

because when u have 5 then take 1 away u have 4

Answer:

So, if a body is taken to moon, the moon attracts the body with a force less as compared to the attraction force by the earth. Hence the weight decreases.

Explanation:

Answer:

Pressure is 1.96 × 10^12 Pa

Explanation:

[tex]{ \bf{pressure = \frac{force}{area} }}[/tex]

height = 4 cm = 0.04 m

density = 20 g/cm³ = 20,000 kg/m³

But for force:

[tex]{ \sf{force = mass \times acceleration}} \\ { \sf{force = ( \frac{density}{volume} ) \times acceleration}} \\ \\ { \sf{force = ( \frac{20000 }{0.04 {}^{3} }) \times 10 }} \\ \\ { \sf{force = 3.13 \times {10}^{9} \: newtons}}[/tex]

For area:

[tex]{ \sf{area = 0.04 \times 0.04 = 0.0016 \: m {}^{2} }}[/tex]

[tex] { \tt{pressure = \frac{3.13 \times {10}^{9} }{0.0016} }} \\ \\ = { \tt{1.96 \times {10}^{12} \: pascals}}[/tex]

Answer:

LDRs and thermistors

Light dependent resistors or LDRs are made of semiconductor material. Their resistance decreases as the light intensity increases. ... Their resistance decreases as the temperature increases.

Answer:

potassium and iodine

Explanation:

Get serious !

It's (length) • (width) • (height) .

Answer:

Velocity

Explanation:

hope this helps

Answer:

Speed in a given direction is called velocity.

Explanation:

Answer:

nine hundred ninety nine

Explanation:

/h/ /t/ /o/

9. 9. 9

Using 3rd equation of kinematics

[tex]\\ \rm\longmapsto v^2-u^2=2as[/tex]

[tex]\\ \rm\longmapsto s=\dfrac{v^2-u^2}{2a}[/tex]

[tex]\\ \rm\longmapsto s=\dfrac{30^2-15^2}{2(5)}[/tex]

[tex]\\ \rm\longmapsto s=\dfrac{900-225}{10}[/tex]

[tex]\\ \rm\longmapsto s=\dfrac{675}{10}[/tex]

[tex]\\ \rm\longmapsto s=67.5m[/tex]

==> Take an Earth weight. Don't forget the unit.

==> Multiply it by 0.166 .

==> The product is its Moon weight. Don't forget the unit.

Example:

If I weigh 1,000 lbs on Earth.

Multiply 1,000 lbs by 0.166 .

I weigh 166 lbs on the Moon

The complete table is as follows -

   ITEM                                   W(E)                               W(M)

   Apple                                 150 g                               25 g

   Hammer                            1.5 lbs                             0.25 lbs

   Person                              180 lbs                              30 lbs

   Blue whale                      200 tons                          33.3 tons

We have the force of gravity on the moon is only 16.6% the force of gravity on Earth.

We have to fill the table given in the question.

In physics, gravity is a fundamental interaction which causes mutual attraction between all things with mass or energy. The gravitational force between two bodies of mass 'm' and 'M' separated by a distance 'r' apart is given by -

[tex]$F = \frac{GMm}{r^{2} }[/tex]

According to the question, we have -

Force of gravity on the moon is only 16.6% the force of gravity on Earth.

This means that for an object of mass 'm' -

F(M) = 16.6% of F(E)

This means that a person would weigh six times less on the moon than they do on Earth -

W(moon) = [tex]\frac{1}{6}[/tex] W(earth)

Let's complete the table -

   ITEM                                   W(E)                               W(M)

   Apple                                 150 g                        1/6 x 150 = 25 g

   Hammer                            1.5 lbs                        1/6 x 1.5 = 0.25 lbs

   Person                              180 lbs                       1/6 x 180 = 30 lbs

   Blue whale                      200 tons                     1/6 x 200 =  33.3 tons

Hence, the complete table is given above.

To learn more about Gravity on moon, visit the link below -

https://brainly.com/question/20045391

#SPJ2

Answer:

[tex]accelaration = \frac{v}{t} \\ = in \: intial2sec \: v = 40 \\ a = \frac{40}{2} = 20 \frac{m}{ {se}^{2} } \\ thank \: you[/tex]

Answer:

20 m/s^2

Explanation:

v = u + at

Velocity:-

u = 0

v2 = 40

v = v2 - u = 40 - 0 = 40

Time:-

t2 = 2

t1 = 0

t = t2 - t1 = 2 - 0 = 2

Substituting v and t in formula,

v = u + at

40  = 0 + (a)(2)

2a = 40

=> a = 40/2

=> a = 20

Answer:

213K = 100. 56

189K = 87. 22

113K = 45

201K = 93. 88

Explanation:

The formula for F to C = ( 1. 8*C) + 32

So, C = (F - 32) ÷ C

Answer:

It's 2–

Explanation:

Usually, in ionic bonds, these elements will receive 2 electrons, so its ion will carry a 2– charge

The ionic charge its ion will carry will be 2-

An element is required to have 8 electrons in its outermost shell to assume it's full octet configuration.

The statement above of course excludes Hydrogen and helium which have only 1 and 2 electrons respectively.

An element with 6 Valence electrons would require 2 electrons to assume the full octet configuration.

As such, it is liable to accept 2 electrons from an electropositive element or group of elements to complete it's octet.

Therefore, accepting 2 electrons adds 2 negative charges and consequently, the ionic form of the element carries a 2- ionic charge

Read more:

https://brainly.com/question/13822373

Answer:

33m

Explanation:

Step 1: Whats going on?

We know that since they meet in the middle, and dont stop, that both knights take the same time to travel to the middle. This means that if they are traveling at a constant speed we can easily calculate the distance each travels

Step 2: Model it with Equations

General equation: V = D/t  [m/s]

T = D1 + D2 = V1*t + V2*t = t * (v1 + v2)

Step 3: Sub in knowns

T = 2.2 s* (6m/s + 9m/s)

T = 33m

Answer:

The value of g on the moon is 1.625 m/s2 and the value of the g on the jupiter is 2.528g.

Jupiter's surface gravity is 24.79/s or 2.528 g .

The acceleration due to gravity on the surface of the moon is approximately 1.625m/s .

hope this helps you

mrk me braniliest plzz

[tex]\Large{\underline{\sf Given:-}}[/tex]

[tex]\Large{\underline{\sf To\:Find:-}}[/tex]

[tex]\Large{\underline{\sf Formula:-}}[/tex]

[tex]\boxed{\sf Force=Mass\times Acceleration}[/tex]

[tex]\Large{\underline{\sf Solution:-}}[/tex]

[tex]\\ \sf\longmapsto Force=4000(35)[/tex]

[tex]\\ \sf\longmapsto Force=14000N[/tex]

Answer:

Your father has just built a new house for the family. Write a letter to your either brother who lives abroad describing the new house and the prestige has accorded your family