Guys plz help answer this!!!!

The correct answer is A physical change

Explanation:

Jorge's experiment shows water at different temperatures; in this experiment, it is expected at low temperatures such as -20°C water is in solid-state (ice), at medium temperatures such as 40°C water is in a liquid state (liquid water), and at high temperatures such as 120°C water is in gaseous state (water vapor). This implies during this experiment the changing factor is the physical state (solid, gas, or liquid), and this is a physical change because only the physical properties of water change but not its composition or identity. According to this, the correct answer is physical change.

Answer:

5.3 cm

Explanation:

This question is an illustration of real and apparent distance.

From the question, we have the following given parameters

Real Distance, R = 8.0cm

Refractive Index, μ = 1.5

Required

Determine the apparent distance (A)

The relationship between R, A and μ is:

μ = R/A

i.e.

Refractive Index = Real Distance ÷ Apparent Distance

Substitute values in the above formula

1.5 = 8/A

Multiply both sides by A

1.5 * A = A * 8/A

1.5A = 8

Divide both side by 1.5

1.5A/1.5 = 8/1.5

A = 8/1.5

A = 5.3cm

Hence, the letters would appear at a distance of 5.3cm

This question involves the concepts of current and charge.

Current 2 has to run for "192 s" to deliver the same amount of charge as current 1.

The current is defined as the amount of charge passing per unit time. Mathematically,

[tex]I=\frac{q}{t}\\\\q = It[/tex]

Since, the charge for both the currents is same:

q₁ = q₂

I₁t₁ = I₂t₂

[tex]t_2=\frac{I_1t_1}{I_2}[/tex]

where,

I₁ = current 1 = 8.4 A

I₂ = current 2 = 10.5 A

t₁ = time for current 1 = 240 s

t₂ = time for current 2 = ?

Therefore,

[tex]t_2=\frac{(8.4\ A)(240\ s)}{10.5\ A}[/tex]

t₂ = 192 s

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Answer:

In these reactions the products are higher in energy than the reactants. ... This barrier is due to the fact that to make CO2 and H2O we have to break 4 carbon-hydrogen bonds and some ...

Explanation:

Answer:

Hey baby, I love you. Yes i do play metal gear with snake

Explanation:

Answer:

Yes me too. I have played.

Explanation:

Answer:

A conductor allows free charges to move about within it. The electrical forces around a conductor will cause free charges to move around inside the conductor until static equilibrium is reached. Any excess charge will collect along the surface of a conductor. Conductors with sharp corners or points will collect more charge at those points.

Explanation:

Answer:

The correct options are A, B, C and E

Explanation:

The above speaks to the characteristics of Minerals.

Option D is excluded because minerals cannot be liquid or gaseous. Even if it is possible, those replicated in the laboratory are not considered as minerals neither are minerals liquid. They must be solid. The molecules for most minerals are very tightly or densely arranged because of the nature of their formation. Most of them are formed under consistent and intense pressure.

Cheers!

Answer:

053.

Explanation:

Given that the radius of curvature of the path, R = 75 m.

Speed of the car on that path , [tex]v_1 = 35 m/s[/tex]

The centripetal force,[tex]F_c[/tex] acting on the body having mass, m, when it moves with the velocity v  on curved path having radiusR

Ris[tex]F_c = mv^2/R[/tex]

Gravitational force, [tex]F_g[/tex] = mg.

Let tha angle of superelevation is [tex]\theta.[/tex]

As the car does not skid even with zero friction, so

[tex]mg\sin\theta = (mv_1^2)/2 \cos\theta[/tex]

[tex]\Rightarrow \tan\theta = v_1^2/2g=\cdots(i)[/tex]

On sunny day, let the minimun static friction coefficient between the wheels and the pavement is [tex]\mu.[/tex]  

As [tex]v_2[/tex] = 118 m/s is greater than   v_so the car tends to skid in upper direction and the frictional

force,f, will acts is downward direction.

As there is no skidding, so

[tex]f+ mg\sin\theta= (m(v_2)^2)/R\cos\theta[/tex]

[tex]\Rightarrow f=(m(v_2)^2)/R\cos\theta - mg\sin\theta[/tex]

where [tex]f= \mu N.[/tex]

[tex]So, \mu = \frac {(m(v_2)^2)/R\cos\theta - mg\sin\theta}{N} \cdots(ii)[/tex]

Where N is the normal reaction can be determined by balancing the force in perpendicular direction of the plane.

[tex]N= mg\cos\theta+\frac {m(v_2)^2}{R}\sin\theta[/tex]

From equation (ii)

[tex]\mu = \frac {(m(v_2)^2)/R\cos\theta - mg\sin\theta}{mg\cos\theta+\frac {m(v_2)^2}{R}\sin\theta}[/tex]

[tex]=\frac{-g\tan\theta+v^2/R}{v_2^2\tan\theta+g}[/tex]

[tex]= \frac {(m(v_2)^2)/R\cos\theta - mg\sin\theta}{mg\cos\theta+\frac {m(v_2)^2}{R}\sin\theta}[/tex]

[tex]=\frac{-g(v_1^2/2g)+v^2/R}{v_2^2(v_1^2/2g)+g}[/tex]

[tex]= \frac{v_2^2/R-v_1^2/R}{g+v_2^2/R\times v_1^2/Rg}[/tex]

[tex]=\frac{118^2/75-35^2/75}{9.81+118^2/75\times 35^2/(75\times 9.81)}[/tex]

=0.53

Hence, the minimum coefficient of friction is 0.53.

Answer:

Explanation:

Frequency, in physics, the number of waves that pass a fixed point in unit time; also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion...............

Answer:

Two tectonic plates move away from each other

Explanation:

I just did this on AP3X. If this is not what your lookinf for then so sorry

Answer:

1595790 gallons

Explanation:

Given that;

3.8 L = 1 US gallon

303,200.0 liters = 303,200.0 * 1/ 3.8 = 79789.5 gallons

If a wave is made every 90 seconds which is 1.5 mins

Then;

Number of waves made in 30 minutes = 30/1.5 = 20 waves

if each uses 79789.5 gallons, then 20 waves will use 20 * 79789.5 gallons = 1595790 gallons

Answer: pluto

Explanation:

pluto is the smallest

Answer:

koj ruam zog

Explanation:

Answer:

the answer of 7th question

Make sure your dishwasher is full before you use it – running a half-empty dishwasher wastes large amounts of energy

Try to use a cooler temperature

Consider drying your clothes outside if it’s warm instead of using the dryer

Turn off the fan when you leave a room

Close your drapes or drop your window shades during the day.

Wash your clothes in cold water.

Wrap or cover foods and drinks in the refrigerator.

Always use the cold water faucet, unless you really want hot water.

the answer of 10th question

Static electricity is used in pollution control by applying a static charge to dirt particles in the air and then collecting those charged particles on a plate or collector of the opposite electrical charge. These devices are commonly known as “electrostatic precipitators.

Answer:

Electricity produced via friction is a development of electric charges on articles. Energizes construct when negative electrons are moved starting with one article then onto the next. The article that surrenders electrons turns out to be decidedly charged, and the item that acknowledges the electrons turns out to be contrarily charged. This can occur in a few different ways.

Explanation:

[tex]\mathrm {All, done!}[/tex]

Answer:

1. because of the tilted axis of earth the seasons in northern hemisphere are the exact opposite of the southern. because the sunrays reaches the earth an different points and when the earth moves around the sun it changes the hemisphere which is tilted to the sun.

2. the northern hemisphere is in Winter and the southern in summer. because the southern is tilted to the sun and the northern not so less sunrays reaches the northern hemisphere.

I'm sorry my explanation are bad

(b) negative charge

This is the answer

Answer:

Physics

Explanation:

:):):)

Answer:D

Explanation:AP3X

The statement describes the interaction between the permanent magnets and the electromagnet in an electric motor is option D.

A substance which is negative charged at one end and positive charged at another end creating the magnetic field around it.

A bar is a magnet which can attract the particle which are charged. It has two poles North and South.

The permanent magnet create magnetic field very strong. The electromagnet is find in the electric motor. In the motor, loop made up of conductor is rotated by the effect of magnetic field of permanent magnet.

Thus, the correct option is D.

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Answer:

c

Explanation:

A spherical solid metal made up of Nickel, Iron and small amount of sulfur, silicon and oxygen.

you are welcome

Answer:

a

 [tex]v_f = 0.916 v_{ex}[/tex]

b

 [tex]v_f = 1.05 v_{ex}[/tex]

Explanation:

Considering question a

From the question we are told that

   The mass of the rocket is  [tex]m_o[/tex]  

    The mass of the fuel which is in the rocket is  m = 0.6 M  

Generally given that the rocket burns all it fuel in a single stage , the final velocity of the rocket is mathematically represented as

          [tex]v_f = v_{ex} ln [\frac{m_o}{m_k} ][/tex]

Here [tex]m_k[/tex] is the mass  of the rocket without fuel which is mathematically evaluated as

        [tex]m_k = m_o- m[/tex]

=>      [tex]m_k = m_o -0.6m_o[/tex]

=>    [tex]m_k = [1- 0.6] m_o[/tex]

=>      [tex]v_f = v_{ex} ln [\frac{m_o}{[1 - 0.6]m_o} ][/tex]    

=>      [tex]v_f = 0.916 v_{ex}[/tex]

Considering question b

From the question we are told that

   The mass of the fuel it burn at the first stage is  [tex]m = 0.3 m_o[/tex]

     The mass of the first stage fuel tank [tex]m_1 = 0.1 m_o[/tex]

    The mass of the fuel at the second stage is  [tex]m_f = 0.3m_o[/tex]

Generally the  velocity of the rocket at the first stage  is mathematically represented as

           [tex]v_i = v_{ex} * ln [ \frac{m_o }{[1- m]m_o } ][/tex]

=>         [tex]v_i = v_{ex} * ln [ \frac{m_o }{[1- 0.3]m_o } ][/tex]

=>         [tex]v_i = v_{ex} * ln [ \frac{1 }{0.7 } ][/tex]  

=>         [tex]v_i =0.357 v_{ex}[/tex]

Generally the mass of the rocket after first stage is  

    [tex]m_r = m_o - 0.3m_o -0.1m_o[/tex]

=>   [tex]m_r = 0.6m_o[/tex]

Generally the final  velocity of the rocket at the second stage is  

     [tex]v_f = v_i + v_{ex} * ln [\frac{m_r}{ m_f } ][/tex]

=>   [tex]v_f = v_i + v_{ex} * ln [\frac{0.6 m_o }{0.3mo } ][/tex]

=>   [tex]v_f = 0.357 v_{ex} + 0.693 v_{ex}[/tex]

=>   [tex]v_f = 1.05 v_{ex}[/tex]

Answer:833

Explanation:

Explanation:

Please mark me as the brainliest answer

Answer:

The electrostatic force is larger by a factor of 8.988E9 / 6.674E-11 = 1.35E20

Explanation:

William gave you all the ingredients, but not the answer.  Being both 1/r^2 forces (resulting from massless mediators in QFT), and with unit charges in the problem (1 coulomb, 1 Kg), separated by unit distance (1m), the only nontrivial numerical values in the problem are the constants of proportionality: Coulomb's constant (k) and Newton's gravitational constant (G).  So to "compare and constrast": the ratio of the forces is simply the ratio of these constants.  The electromagnatic force is 1.35 X 10^20 times stronger than the gravitational force.  Assuming positive charge on both objects (the problem is ambiguous on this), they are repelled, whereas the much weaker gravitational force is attractive.  (Gravity only has one kind of "charge" - it's unsigned - and the force is always attractive).  

The problem doesn't say the objects are pointlike: if they have some extent and are either conductive or made of some dielectric, then things get messy because the charge distribution on the object won't be uniform then, but save that for grad school. :-)

Answer:

See the explanation below

Explanation:

The pressure is defined as the product of the density of the liquid by the gravitational acceleration by the height, and can be easily calculated by means of the following equation.

[tex]P=Ro*g*h[/tex]

where:

Ro = density of the fluid [kg/m³]

g = gravity acceleration = 9.81 [m/s²]

h = elevation [m]

In this way we can understand that the greater pressure is achieved by means of the height of the liquid, that is, as long as the fluid has more height, greater pressure will be achieved at the bottom.

Therefore in order of decreasing will be

The largest pressure with the largest height of liquid, container B. The next is obtained with container D, the next with container A and the lowest pressure with container C.

The pressure decreases as we go from the container B - D - A - C

Answer:

Chuck's average speed is 60.

Answer:

acceleration is 8 m/s²

Explanation:

a = 36 - 12 / 3

a = 24 / 3

a = 8

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Answer:

1

Explanation:

1

Answer:

average speed = 0.5 m/s

Explanation:

average speed = (distance) / (elapsed time)

Given time elapsed = 30 seconds and distance = 15 meters

average speed = 15 meters / 30 seconds = 0.5 meters/second = 0.5 m/s

Answer: thermal energy

Explanation: hope this helps

Answer:

resultant force=16N→(TOWARDS THE DIRECTION OF 8N)

Explanation:

resultant force=8N+13N-5N

                        =16N→(TOWARDS THE DIRECTION OF 8N)