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Answer:

Invasive plants also degrade the environment by changing the species composition and the ecology of invaded ecosystems

Explanation:

Answer:

they can harm the enviroment by changing the species composition and the ecology of invaded ecosystems !!

Length, l=1 km=1000 m

Radius, r=1 mm=10^−3 m

the resistance.

Specific resistance of copper:

ρ=1.72×10^−8

Area of cross-section:

A=π×r2=3.14×10^−6 m^2

Let the resistance be R.

As we know, R=ρ l/A

On substituting values:

R=1.72×10^−8×10^3/3.14×10^−6

=5.5 ohm

⇒ Resistance of the copper wire, is 5.5 ohm.

5.5 Ω

Explanation:

Given : l = 1 km = 1000 m, r = 1 mm = 10^-3 m,

[tex]a = \pi {r}^{2} [/tex]

[tex]= > 3.14 \times ( {10}^{ - 3} )^{2} \\ = > 3.14 \times {10}^{ - 6} \: {m}^{2} .[/tex]

[tex]specific \: \: resistance \: \: ρ \: \\ = > 1.72 \times {10}^{ - 8} Ω \: m[/tex]

Resistance (R) :-

[tex]R \: = ρ \times \frac{l}{a} \\ \\ = > \frac{(1.72 \times {10}^{ - 8} ) \times 1000}{3.14 \times {10}^{ - 6} } \\ \\ = > 5.5 \: Ω[/tex]

We can make the claim that light can be reflected, which is justified by the reflection seen on the water as well as the colors seen in the photo.

We can claim that light can and is being reflected in this image due to the reflection in the water as well as the colors. As the light traveling in the air collides with the water, it abruptly changes speed, causing a portion of these waves to be reflected back, thus creating a mirror image on the surface of the water. This is also the case with colors, which are caused by a material reflecting all but one wavelength of light.

Therefore, we can confirm that it is possible to make the claim that light can be reflected, which is justified by the reflection seen on the water as well as the colors seen in the photo.

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Answer:

15 000 N

Explanation:

Newtons Law 2. When a body is acted upon by a force, the time rate of change of its momentum equals the force.

F=ma

a=30m/s / 3s=10m/c²

F=1500kg*10m/c²=15 000 N

Answer:

D. The DNA strands are different

Explanation:

K12 and I took the test

Here is proof

A mutation during replication affect the DNA cause the DNA strands are different. hence option D is correct.

Deoxyribonucleic acid is a polymer composed of two polynucleotide chains that coil around each other to form a double helix. The polymer carries genetic instructions for the origin, functioning, development, and reproduction of all known organisms and viruses. DNA and ribonucleic acid (RNA) are examples of nucleic acids. Nucleic acids, together with proteins, lipids, and complex carbohydrates (polysaccharides), are one of the four basic macromolecule groups necessary for all known forms of life.

Because they are made up of simpler monomeric units called nucleotides, the two DNA strands are known as polynucleotides. Each nucleotide is made up of one of four nitrogen-containing nucleobases (cytosine, guanine [G], adenine [A], or thymine [T]), deoxyribose, and a phosphate group. Covalent bonds link the nucleotides together to form a chain.

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Answer: A

Explanation:

Isotopes of different elements differ by the number of neutrons inside the nucleus.

The isotope of uranium-238 is different from the isotope uranium-235 by number of neutrons in the nucleus.

Isotopes are two or more types of atoms that have the same atomic number and position in the periodic table, and that differ in nucleon numbers due to different numbers of neutrons in their nuclei.

Uranium-238 is the most common isotope of uranium found in nature, with a relative abundance of 99%. It can be used for radiation shielding or as projectiles in armor-piercing weapons.

Uranium-235 is the only naturally occurring fissile isotope, which makes it widely used in nuclear power plants and nuclear weapons.

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Answer:

525 j

Explanation:

Work = force * distance

               350 N * 1.5 m =

Answer:

142428.358 J must be added per kg of water.

Explanation:

because the heat of the water is 4.18 J per kg of water then 75 degrees Celcius is 142,432 J then 142432.53750000108 - 4.18 = 142428.358 J for per kg of water.

1 × 3 = 3

36 ÷ 2 = 18

18 + 3 = 21

14 × 3 = 42 you can also do 7 × 6 and will get the same result because 7 is half of 14 and 3 is half of 6

21 + 42 = 63

63 ÷ 6 = 10.5 [tex]-- >[/tex] 10 remainder of 3 remainder means left over

Answer:

"Health psychology is a specialty area that focuses on how biology, psychology, behavior, and social factors influence health and illness."

-Verywell Mind

Hope I helped!

Explanation:

Explanation:

Answer: Its (B)

Explanation

Answer:

Option B

Explanation:

See angular velocity is decreasing with respect to time , angular acceleration is negative .

The slope of the graph should be angular acceleration as slope is change in y with respect to x .

Here initial velocity made twice

so y intercept or vertical intercept should go twice up wards.

The horizontal intercept will also go twice rightwards because slope or angular acceleration is constant given .

If scale is one box=1units

Remember that displacement will be doubled also

Answer:

the frequency and the radiation of radiation decreases.

Explanation:

[tex]energy = elastic \: potential[/tex]

[tex]4 = \frac{1}{2} kx {}^{2} [/tex]

[tex]4 = \frac{1}{2} (2500)x {}^{2} [/tex]

[tex]4 = 1250x {}^{2} [/tex]

[tex]x {}^{2} = \frac{4}{1250} = 0.0032 \: meters[/tex]

[tex]x = \sqrt{0.0032} = 0.05657 \: meters[/tex]

Explanation:

after rereading: Yes, there is a term for water on the moon and it's called lunar water, pretty straightforward. you can check out moon.nasa.gov, or literally look this up in the magical (g-engine) and it'll gove you a few articles.

______________________

oh my, sorry, i thought the question asked if the moon moved water, in which case: I wouldn't say that the moon actually MOVES the water, but yes, its gravitational force is strong enough to affect tides on Earth. (i could've sworn that's what I saw but whatever, sorry!)

Answer:

frictional force

Magnetism is the property of a material produced, by the motion of electric charge resulting in attraction and repulsion between objects.

Answer:

A. An attractive, weak force

Explanation:

I got it right

An attractive, weak force best explains the interaction between the two charges. The force between two charges is known as the Columb's force.

When the matter is put in an electromagnetic field, it has an electric charge, which causes it to experience a force. A positive or negative electric charge can exist.

Charges that are similar repel each other, whereas charges that are dissimilar attract each other. The term "neutral" refers to an item that has no net charge.

A large positive charge is placed very far away from a small negative charge. Due to the far distance, the force will be a weak force.

While due to the opposite polarity the charge is attractive in nature.

Hence an attractive, weak force best explains the interaction between the two charges

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Answer:

If the charges of both the paper and glass attract we can deduce that both charges with opposite signs. If they were repelling each other then their charges would have the same sign.

so in this case:

ONE HAS A POSITIVE CHARGE WHILE THE OTHER HAS A NEGATIVE CHARGE

The period of the orbit of the spacecraft around Venus is 5187.3 seconds.

The period, T, of an object in circular motion is the time taken for one complete revolution.

The period, T, of the planetary body is given as:

[tex]T = 2\pi\sqrt{\frac{r^{3}}{Gm}}[/tex]

where;

Substituting the values:

[tex]T = 2\pi\sqrt{\frac{(6.05 \times 10^{6})^{3}}{6.67 \times 10^{ - 11} \times 4.87 \times 10^{24}}} = 5187.8s[/tex]

Therefore, the period of the orbit of the spacecraft is 5187.3 seconds.

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Answer:

See Below

Explanation:

1) When we add another lamp into a series circuit, the total resistance increases, this means that the total current is the same. Also, the potential difference across each of the lamps decreases. This means that the lamps all become dimmer.

2)When we add another lamp into a parallel circuit in a new branch, the total resistance decreases, the current through each lamp decreases. Also, the potential difference across each of the lamps is the same. This means that the lamps have the same brightness.

Answer:

directly

Explanation:

Answer: Directly

Explanation:

Most of the night sky would be dark with only a few stars if the solar system were moved on the edge of galaxy.

If the Sun and Earth were moved on the edge of an elliptical galaxy, we can see most of dark and few stars in the sky at night because stars are present at large number at the center of galaxy and fewer at th edges.

So we can conclude that most of the night sky would be dark with only a few stars if the solar system were moved on the edge of galaxy.

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Answer:

Convection is the transfer of heat from one place to another along with the motion of the object's particles. Water is a poor conductor. However, when the bottom water is heated, it turns out that the top water is also hot. This means that there is another way of transferring heat to the water, namely convection.

Explanation:

A convectional current is a process that involves the movement of energy from one place to another.

Answer:

if its adding its 9 if its multiplying its 18 if its division its 2

By conservation of momentum,

(2510 kg) (23.0 m/s) + (1750 kg) (12.3 m/s) = (4260 kg) v

where v is the velocity of the combined cars.

Solve for v :

(4260 kg) v = 79 255 kg•m/s

v ≈ 18.6 m/s

The error in the measurement of sin 90 degrees at the given error in angle is  0.001.

The error in measurement is obtained from the difference between the actual measurement and the observed measurement.

The error of sin 90 degrees is calculated as follows;

Actual measurement = sin 90 = 1

Observed measurement = sin(90 - 0.5)

Observed measurement = sin(89.5) = 0.999

Error in measurement = Actual measurement - Observed measurement Error in measurement = 1 - 0.999

Error in measurement  = 0.001

Thus, the error in the measurement of sin 90 degrees at the given error in angle is  0.001.

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Answer:

B same method

Explanation:

Answer:

the measured charge will be -2 elementary charges.

Explanation: