Which statement about natural selection on early earth is correct?.

Answer:

Sound travels fastest in ice because energy is easier to transfer when the molecules are close together.

Explanation:

The statement which best explains the speed of sound in different states of matter is that sound travels fastest in ice because energy is easier to transfer when the molecules are close together. Thus, the correct option for this question is A.

In ice, the atoms are present close to each other. It facilitates the transfer of sound waves in the ice medium. The closer the atoms are to each other, the higher the pitch, and vice versa.

As in ice, the high-frequency sound waves propagate faster; hence that high tone right at the start rapidly drops in pitch. The high-frequency vibration hits your ear first, with the low-frequency tone right on its heels.

In ice, the interaction of sound with the ice affects transmission loss. While in steam the atoms are far apart due to which the waves do not propagate successfully.

Therefore, sound travels fastest in ice because energy is easier to transfer when the molecules are close together. Thus, the correct option for this question is A.

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Answer: 5.44 m/s

Explanation:

Given:

Mass of cart: 160 kg

Momentum of cart: 870 kg•m/s

[tex]$$Momentum $|\rho|=m \times v$$$\begin{aligned}&870 \ kg\cdot m/s=160 \mathrm{~kg} \times v \\&v=5.44 \mathrm{~m} / \mathrm{s}\end{aligned}$$[/tex]

Answer:

The momentum is defined as :

P=mv

Where m is the mass and v is the velocity. In this case we know the mass is 160 kg and the momentum is 870 kg plugging in this equation above and solving for the velocity we have

870=160V

V=870÷160

V=5.44

Therefore, the velocity of the cart is 5.44 m/s.

Answer:

1.) Gas = Are the particles moving quickly in a radom pattern?

2.) Plasma = Are the particles electrically charged?

3.) Solid = Are the particles vibrating in a fixed position?

4.) Liquid = Are the particles sliding past each other?

Hope this helps!

[tex]

\mathbb \blue{Answer }[/tex]

[tex]Introducing \: \: a \: dielectric \: \: into \: \\ a \: \: capacitor \: \: decreases \: \: \\ the \: \: electric \: \: field, \: \: \\ which \: \: decreases \: \: the \: \: \\ voltage, \: \: \ which \: \: increases \: \: the \: \: \\ capacitance. \: \: A \: capacitor \: \: with \: a \: \\ dielectric  \: \: stores \: the \: \\ same \: \: \ charge \: \: as \: one \: \\ without \: \: a \: dielectric, \: but \: at \: \\ a \: \: lower \: \: voltage. \: \: \\ Therefore \: \: a \: \: capacitor \: \: with \: \: a \: \\ dielectric \: \: in \: \: it \: \\ is \: \: more \: \: effective \: [/tex]

[tex]\mathbb \blue{ I \: hope \: it's \: helpful \: \: for \: you }[/tex]

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Answer:

No

Explanation:

If a positively charged object is brought near a negatively charged electroscope, it will attract some of the excess electrons up the stem and out of the leaves, causing the leaves to come slightly together

Answer:

Pls make me brainliest

Explanation:

the compression force is the force generated from compressing an object or substance. When shearing forces are aligned into each other, they are called compression forces.

The compression force is used to power everything from compression brakes to hand tools. The compressive strength of materials and structures is an important engineering consideration.

The compression force can be visualized by placing an object on a spring. When the spring is compressed and then released, the object is ejected into the air.

This is a result of the compression force that is generated from compressing the spring.

This system has a constant velocity, and there is an equilibrium because the tension in the cable, which is pulling up the object, is equal to the weight force, i.e., mg. Where M is a mass, and g is the acceleration caused by gravity, which is pulling down the object.

The Formula of Tension.

T = Mg

Tension word becomes from a Latin word meaning “to stretch.” Testing part of the force, Like one type of pull force. All physical objects that are in contact may exert forces on each other.

This contact forces different names based on these types of objects in contact. Where one of the objects exerting the force happens to be a rope, string, chain, or cable we call the force tensions

The given reaction, HCl + NaOH --- NaCl + H₂O is an example of an exothermic reaction. Hence, option A is correct.

In a reaction, the energy released in the form of heat is called an exothermic reaction. In an exothermic reaction, the heat energy is transferred to the surroundings. The chemical equation is Reactant = Product + Energy.

The energy absorbed from the surroundings is called an endothermic reaction. The heat energy taken from the reactants to form a product is called an endothermic reaction. It is described by the chemical equation as Reactant + Energy = Product.

From the given reaction,

HCl + NaOH --- NaCl + H₂O

HCl and NaOH is reactant and NaCl and water is a product. When strong acid (HCl) is mixed with a strong base (NaOH), it gives sodium chloride(NaCl) and water along with heat energy.

When the product is formed from the reactant, heat energy is released. This reaction is also called a Neutralisation reaction. The neutralization reaction are exothermic reaction, that forms chemical bonds by the release of energy.

When water is formed as a product by the release of greater energy than the energy absorbed is called a Neutralization/ exothermic reaction. Hence, the correct option is A) It is exothermic.

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Answer:

Since 1997: A second is a time equal to 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom.

This definition refers to a caesium atom at rest at a temperature of 0 K

Explanation:

Answer: A CT scan involves multiple X-Ray images

Explanation:

I did it and it was correct

Answer:

Explanation:

We know the relation :

We are given that :

Hence, on substituting the values in the equation :

The given information is,

→ Mass = 2 kg

→ Acceleration= 8.3 m/s

→ Force = F (in Newton)

Now we have to find the,

→ Amount of force applied to the object.

Formula we use,

→ F = Mass × Acceleration

Then the amount of force will be,

→ F = Mass × Acceleration

→ F = 2 × 8.3

→ [ F = 16.6 N ]

Hence, the amount of force is 16.6 N.

Answer:

Momentum must be conserved in the collision.

The steel block must move faster after the collision to preserve momentum.

If the steel block is moving faster it will aso have more kinetic energy.

(Note; If the bullet hits the steel block it will have some momentum in the reverse direction and thus have a greater change in total momtntum than the bullet that becomes imbedded in the wood block)

Answer:

F

Explanation:

Reducing access will cause less damage to occur

Answer: the answer is false

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

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

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

We know that, to find the Kinetic energy we are required mass and velocity and Here Both parameters are provided But mass is in gram so we need change it into kg,

1g = 0.001kg,

⠀⠀⠀50g = 0.05g

Now we know the formula of Kinetic energy,

[tex] \sf \boxed{ \star\bf{\: Kinetic \: energy = \frac{1}{2} m {v}^{2}}} \\ \\ \qquad \qquad = \frac{1}{ \cancel2} \times 0.05 \times \cancel{20}\times 20 \\ \\ \qquad \qquad =0.05 \times 200 \\ \\ \qquad \qquad \sf = 10J \: [/tex]

Hence, the kinetic energy of the pebble is 10J.

Answer:

He could use a really big pulley system or get in it and drive or call a tow truck.

Answer:

hey

Explanation:

Displacement covered by the man calculated by using Pythagoras theorem is 10 km.

Pythagoras theorem states that, for a right-angled triangle, the square of the hypotenuse side is equal to the sum of squares of the altitude and base sides.

Here,

The Pythagoras Theorem can be written as,

c² = b² + a²

where c is the hypotenuse, b is the base and a is the altitude of the triangle.

An example of application of the Pythagoras theorem is,

A man started walking from his home and covered a distance of 8 km towards the east and then turned right and walked a distance of 6 km towards the south, what is his displacement now from his starting point ?

A line drawn from his current position and his initial point represents the displacement covered by the man.

Let the starting point be A, then he walks to the point B and then he turns right and walks upto the point C.

Drawing a figure including all the data, we get a right angled triangle, ABC. So,

The base of the triangle, BC = 6 km

Altitude of the triangle, AB = 8 km

The displacement of the man = hypotenuse of the triangle

d = AC

According to Pythagoras Theorem,

AC² = BC² + AB²

AC² = 6² + 8² = 100

AC = √100

Therefore, displacement, d = AC = 10 km.

Hence,

Displacement covered by the man calculated by using Pythagoras theorem is 10 km.

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Attaching the image file here.

The solar system shows the planets in their orbits around the sun in this order: Mercury, Venus, Earth with Moon, Mars, Jupiter, Saturn. Fixed stars are around the outside of the orbit of Saturn.

Explanation:

Aristarchus of Samos was an ancient Greek astronomer and mathematician who presented the first known heliocentric model that placed the Sun at the center. So I had to choose the choice that was most similar to that.

Answer:

Your answer would be:
B.) False


If a car drives on a road for a nonzero amount of time, then its average velocity must be nonzero.

If a car drives for a nonzero amount of time, then its average acceleration must be nonzero.

Explanation:

Have a great rest of your day
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The image here is not found here but star formation is characterized by clouds of dust where stars are born.

Star formation is a physical phenomenon where molecular clouds in space need to collapse to generate stars.

Stellar evolution is a process that initiates when a star is formed and ends when it dies (formation of a red giant).

Stars can be generated inside clouds of dust which are dispersed in different types of galaxies in the universe.

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When air rises in the atmosphere it gets cooler and is under less pressure. When air cools, it's not able to hold all of the water vapor it once was. Air also can't hold as much water when air pressure drops. The vapor becomes small water droplets or ice crystals and a cloud is formed.

I hope this helps you..

Answer: 570 J

Explanation:

The amount of heat gained by the piece of zinc can be calulctaed using   ∆Q = mc∆T

=> ∆T = 36-26 = 10°C

m = 0.15 kg, s = 380J/kg/°C

=> ∆Q = 0.15 x 380 x 10

= 570J

Answer:

11. true

12.

13. an upside down tree

14. copd

The approximate speed of the sound wave traveling through the solid material is 1012m/s.

Wavelength is simply the distance over which the shapes of waves are repeated. It is the spatial period of a periodic wave.

From the wavelength, frequency and speed relation,

λ = v ÷ f

Where λ is wavelength, v is velocity/speed and f is frequency.

Given the data in the question;

To determine the approximate speed of the wave, we substitute our given values into the expression above.

λ = v ÷ f

2.3m = v ÷ 440s⁻¹

v = 2.3m × 440s⁻¹

v = 1012ms⁻¹

v = 1012m/s

Therefore, the approximate speed of the sound wave traveling through the solid material is 1012m/s.

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Answer:

Option B

Explanation:

Option B

Answer is PHOTOELECTRIC EFFECT

Answer:

Mars

Explanation:

It would be Mars because Mars has the least mass out of al the planets in the Solar System, and that would affect its gravitational pull.

I hope it helps! Have a great day!

Anygays-

In a circuit, when the electrical resistance increases, the current _______ because it is _______ for the electrons to flow.

[tex] \\ [/tex]

In a circuit, when the electrical resistance increases, the current decreases because it is blocking for the electrons to flow.

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Answer:

Just beneath the photosphere, and extending inward to about 0.7 Rsun, is the convection zone. Energy generated in the core of the Sun moves outward through this layer by a boiling motion in which hot plasma rises, releases some of its energy, cools, and then sinks again.

Explanation:

Answer:

F = M a

M = 3 kg

a = 2.2 m/s^2

T = tension in rope

T - M g = M a             Where T - M g is the net force on the bucket

T = M (g + a) = 3 kg * (9/80 + 2.20) m/s^2  = 36 Newtons

For Light of wavelength 630 nm (630 x 10-9 m) is used to produce a double slit diffraction pattern where the third order image is 0.10 m the distance of  the screen from the slits  is mathematically given as

D = 26m

Generally, the equation for the small-angle approximation  is mathematically given as

x = n(Landa)D/d

therefore,

D =  0.10x4.9 x 10-5/(3x630 x 10-9)

D = 26m

In conclusion, the distance of  the screen from the slits is

D = 26m

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Answer:

See below    ( was it REALLY 1/4 INCH??)

Explanation:

Calculate the volume of the sphere

v = 4/3 pi r^3

 this times the density of the oil will give g displacement

   then f = ma

4/3 pi (.25 in  * 2.54 cm/inch) ^3  * .961 = 1.0307 gm

1.0307 gm   is   .0010307 kg

f = ma = .0010307 * 9.8 = .0101 N