Suppose it turns out that one in 1 million stars has a planet that at some point in its history is home to an advanced civilization. Then the total number of civilizations that have arisen in our galaxy would be closest to _____. Assume there are about 100 billion stars in the Milky Way galaxy.

The maximum mass of an object traveling at 479 m⋅s−1 for which the de broglie wavelength is observable, is 3.82×10⁻²⁷ kg.

To find the wavelength of a wave, Broglie given an equation. This equation for wavelength is,

[tex]\lambda=\dfrac{h}{mv}[/tex]

Here, (h) is the planks constant, m is mass and (v) is the velocity.

Assuming that the smallest measurable wavelength in an experiment is 0. 450 fm. The speed of the object is 479 m⋅s−1.

Put the values in the formula,

[tex]\lambda=\dfrac{h}{mv}\\ 0.450\times10^{-15}=\dfrac{6.63\times10^{-34}}{m\times479}\\m=3.07\times10^{-21}\rm \;kg[/tex]

Thus, the maximum mass of an object traveling at 479 m⋅s−1 for which the de broglie wavelength is observable, is 3.82×10⁻²⁷ kg.

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Electrons are the particle will be deflected toward the positive plate as it enters the electric field.

An electric field is an electric property that is connected with any location in space where a charge exists in any form. The electric force per unit charge is another term for an electric field.

The field's direction is determined by the direction of the force acting on the positive charge. A positive charge produces a radially outward electric field, whereas a negative charge produces a radially inward electric field.

A physical field that surrounds electrically charged particles and exerts a force on all other charged particles in the field, either attracting or repelling them, is referred to as an electric field.

Hence,electrons are the particle will be deflected toward the positive plate as it enters the electric field.

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Answer:

what he said

Explanation:

i got it right

Answer:

10% efficiency

Explanation:

Formula for efficiency :

⇒ Efficiency (η) = Output energy (E₂) / Input energy (E₁)

===============================================================

Given :

⇒ Input Energy (E₁) = 150 J

⇒ Output Energy (E₂) = 15 J

=============================================================

Solving :

⇒ η = 15/150

⇒ η = 1/10

⇒ η = 10% efficiency

Answer:

Rechargeable batteries can still go flat after repeated use because the materials involved in the reaction lose their ability to charge and regenerate

Explanation:

they go flat because they a rechargeable and sometimes don't always work

thank you hope u have a good day

Answer:

Speedometer

Explanation:

Have a good day! :3

Answer:

Explanation:

According to ohm's law, we know that:

Where,

Substituting the values, we get:

→ 2000 = 200 × R

→ 2000/200 = R

→ 10 = R

Hence,

E=1. 55× 10−19 J.

ultraviolet light

When an electron drops from n = 2 to n = 1, it emits a photon of ultraviolet light. The step from the second energy level to the third is much smaller. It takes only 1.89 eV of energy for this jump. It takes even less energy to jump from the third energy level to the fourth, and even less from the fourth to the fifth.

Answer:

Cosmonauts

Explanation:

As the americans are called astronauts which means star sailors and the russians (soviet space pilots) are called cosmonauts which means sailors of the universe

Answer:

10000000000000000000000000000000000

Explanation:

Analyses of the different situations from time to time provide us with a more valid conclusion about our cognitive and other senses, as these developed and well-nurtured a more frequently by watching the different movies and stuff like videos, which would rather help different people to enhance their abilities to develop more and know more about the different terms related.

While any video that is related to the elaboration and improvement of human behavior can greatly enhance one's ability to know about his or her's ability to think and sense more.

As there are various aspects of consciousness and deal with different situations it makes it more understandable to have even more knowledge about the cognitive and motor abilities of the individuals.                                                

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thank you hope u have a good day    

The order of ionic compounds by the magnitude of their lattice energy in from the highest magnitude to lowest is BeO>MgO>Na₂O>Na₂S>LiCl.

The lattice energy is the change of energy of the experimental energy actual energy of the ionic solid. This energy is based on the distance between the ions and the charge of those ions.

The ionic compounds which need to be arranged in order of lattice energy are,

LiCl, MgO, Na2O, BeO, Na2s.

The lattice energy of the given compounds is:

Thus, the order of ionic compounds by the magnitude of their lattice energy in from the highest magnitude to lowest is,

[tex]\rm BeO > MgO > Na_2O > Na_2S > LiCl.[/tex]

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Answer:

The ballon would be inflated. The reason is that the sodium bicarbonate in baking soda reacts with acetic acid in vinegar to produce gas.

Explanation:

The main component of baking soda is sodium bicarbonate, [tex]{\rm Na_{2}CO_{3}}[/tex].

Vinegar is mostly a solution of acetic acid [tex]{\rm CH_{3}COOH}[/tex] in water.

Acids such as acetic acid react with carbonate salts. One of the products of such reactions is carbon dioxide [tex]{\rm CO_{2}}[/tex], a gas.

In this question, when the acetic acid in vinegar reacts with sodium bicarbonate in the baking soda, the following reaction would occur:

[tex]\begin{aligned}& {\rm Na_{2}CO_{3}}\, (aq) + 2\, {\rm CH_{3}COOH}\, (aq) \\ &\to 2\, {\rm CH_{3}COONa}\, (aq) + {\rm CO_{2}}\, (g)\end{aligned}[/tex].

The [tex]{\rm CO_{2}}[/tex] produced would then inflate the ballon placed on the opening of the bottle.

Answer:

the Answer To the question is b&c

The pressure exerted by oil of density of density 900kg has to be calculated when the height of liquid column is 12 meter, is 1.06×10⁶ Pa.

Pressure is the force applied perpendicular on the surface of the object per unit its area, where the force is distributed. The formula of pressure can be given as,

[tex]p=\rho \times g \times h[/tex]

Here, [tex]\rho[/tex] is the density of fluid, g is the gravitational acceleration and h is the height.

The pressure exerted by oil of density of density 900kg has to be calculated.  The height of liquid column is 12 meter.​ Put the values in the above formula,

[tex]p=\rho \times g \times h\\p=900 \times 9.81 \times 12\\p=105948\\p\approx1.06\times10^5\rm\; pa[/tex]

Thus, the pressure exerted by oil of density of density 900kg has to be calculated when the height of liquid column is 12 meter, is 1.06×10⁶ Pa.

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Answer:

NASA's Artemis program aims to land another man and the first woman on the moon by 2024 and eventually establish sustainable space travel by 2028. The Artemis program is NASA's stepping stone to their ultimate goal of landing on Mars.

Explanation:

To choose the correct box plot, verify each of the options and make sure all the values in the plot match the values provided.

In a box plot, this value is represented by a vertical line located in the middle of the graph.

The maximum is the value located on the farthest right, while the minimum is located on the farthest left.

Divide the graph into 4 and analyze how much each quartile represents.

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Answer:

To choose the correct box plot, verify each of the options and make sure all the values in the plot match the values provided.

Explanation:

The power output is, 2800 watt. Power is defined as the rate of the work done.

Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body. Force is defined as the product of mass and acceleration. Its unit is Newton.

The power output is found as;

[tex]\rm P = \frac{W}{t} \\\\ P= \frac{F \times d }{t} \\\\ P= \frac{2800 \ N \times 80.0\ m}{8.0 \ sec} \\\\ P=2800 \ Watt[/tex]

Hence,the power output is, 2800 watt.

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Given speed and the distance that must be covered, the time it will take the ultraviolet light to reach the earth is 3.7 × 10⁴ hours.

Speed is simply referred to as distance traveled per unit time.

Mathematically, Speed = Distance ÷ time.

Given the data in the question;

We substitute our given values into the expression above.

Speed = Distance ÷ time

1.08 × 10⁹km/h = 4.0 × 10¹³km ÷ t

t = 4.0 × 10¹³km ÷ 1.08 × 10⁹km/h

t = 3.7 × 10⁴ hrs

Therefore, given speed and the distance that must be covered, the time it will take the ultraviolet light to reach the earth is 3.7 × 10⁴ hours.

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The number of electrons running in a stream comprises the charge. The excess electrons on this balloon with the given charge are 2.9 × 10¹³.

The charge is the number of electrons flowing in the stream of current times the charge on that electrons.

Q= n×e

The charge on the electrons e =1.6×10⁻¹⁹ C and the given charge on the balloon is 3.5μC = 3.5×10⁻⁶ C

the number of the excess electrons will be

[tex]n=\dfrac{3.5\times10^{-6} C}{1.6\times10^{-19} C}=2.19\times10^{13}[/tex]

The excess electrons on this balloon with the given charge are 2.9 × 10¹³.

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Answer:

Because unlike a flat mirror, the curved surface of the spoon's bowl bounces incoming rays back towards a central focus point lying between your face and the centre of the spoon's. In passing through this point, rays from the upper part of your face are reflected downward, while those from the lower part are reflected upward.

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When a light beam enters a transparent material at an angle of incidence, the refraction takes place. This transparent material is diamond.

The material through which a person can be able to see clearly, when light falls on it.

The Snell's law is the ratio of sine of angle of incidence to the sine of angle of refraction is equal to the ratio of refractive index of the two mediums.

sin i /sin r = n₂ / n₁

The angle of incidence of light is 38⁰ and angle of refraction is 14.76⁰. The air has refractive index is 1, then the refractive index of the transparent material is

n₂ = sin 38 x 1 /sin 14.76

n₂ = 2.4165

The refractive index of the transparent material is approximately 2.417.

Thus, the transparent material is diamond.

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The tension in the string which supports the 5.0 kg cylinder of solid iron and submerged in water is 42.8 N.

Tension is the pulling force carried by the flexible mediums like ropes, cables and string. Tension in a body due to the weight of the hanging body is the net force acting on the body.

A 5. 0 kg cylinder of solid iron is supported by a string while submerged in water. The density of iron is 7860 kg/m3 and that of water is 1000 kg/m3.

The tension in string can be find out using the following formula,

[tex]T=mg\left(1-\dfrac{\rho_w}{\rho_i}\right)[/tex]

Here, m is the mass of solid, g is gravitational force, ρ is the density and subscript (w and i) is for water and iron respectively.

Put the values,

[tex]T=5\times9.81\left(1-\dfrac{1000}{7860}\right)\\T=42.8\rm\; N[/tex]

Thus, the tension in the string which supports the 5.0 kg cylinder of solid iron and submerged in water is 42.8 N.

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The distance the package above the ground when it was released, s ≈ 530 meters

The kinematic equation of motion gives the interrelationships of the variables of motion.The correct option for the distance the package above the ground when it was released, is the third option;

It is given that:

The velocity of the helicopter from which the package was dropped = 15 m/s

The time it takes the package to strike the ground = 12 seconds

The required parameter:

The height of the package from the ground when it was dropped

The kinematic equation of motion relating distance, s, time, t, acceleration due to gravity, g, initial velocity, u, and final velocity, v, is applied as follows;

The package continues the upward motion for some time, t₁, given as follows;

Upward motion of the package

v = u - g·t₁

v = 0 at highest point reached by the package;

Therefore;

0 = 15 m/s - 9.81 m/s²  × t₁

t₁ = 15 m/s/(9.81 m/s²) ≈ 1.5295022 seconds

The time the package takes to return to the initial starting point, t₂ = t₁

The time the package falls after returning to the point it was dropped, t₃, is given as follows;

t₃ = t - (t₂ + t₁) = t - 2 × t₁

∴ t₃ = 12 s - 2 × 1.5295022 s ≈ 8.940996 s

From the symmetry of the motion of a projectile, the velocity of the package when returns to its staring point where it was dropped = u (Downwards) = 15 m/s

The distance the package falls, s, which is the distance the package above the ground when it was released, is given as follows;

s = u·t + (1/2)·g·t²

s = 15× 8.940996  + (1/2) × 9.81 × 8.940996² = 526.22755346 ≈ 530

The distance the package falls, s ≈ 530 m = The height of the

The distance the package above the ground when it was released, s ≈ 530 meters

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The velocity of the ball as it passes a treetop 4. 88 m tall and  thrown straight upward with a velocity of 9. 98 m/s is 14 m/s.

The equation of motion is the relation between the distance, velocity, acceleration and time of a moving body.

The third equation of the motion for distance can be given as,

[tex]v^2-u^2=2ah[/tex]

Here, is the u initial body, a is the acceleration of the body and h is the height of it.

The ball is thrown straight upward with a velocity of 9. 98 m/s. The height of it is 4. 88 m. Thus, initial velocity is 4.88 meters and the acceleration due to gravity is 9.98 m/s².

Put the values,

[tex]v^2-u^2=2ah\\v^2-(9.98)^2=2(9.98)(4.88)\\v^2=2(9.98)(4.88)+(9.98)^2\\v\approx 14\rm\; m/s[/tex]

Hence, the velocity of the ball as it passes a treetop 4. 88 m tall and  thrown straight upward with a velocity of 9. 98 m/s is 14 m/s.

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Answer:

It says about the motion and the graph of the object is stationary, basically travelling at the same speed at any time of the graph. It will never change.

Explanation:

To draw a diagram:

1. Draw an object and represent the speed as stationary and constant at any time.