Which of the following describes an action-reaction pair?
O A. You push a car forward, and the car pulls you forward.
B. Earth's gravity pulls down on you, and your gravity pulls up on
Earth.
C. Friction slows you down, and the normal force holds you up.
D. Your hat pushes down on your head, and your feet push down on
the ground.

Increasing human population have advanced the problem of the impact of humans on the environment as shown above.

We know that the environment has to do with our natural surroundings. The environment has to do  with that space that is around us from which we obtain the materials and energy that are necessary to support life.

We know that the greatest pressure that is placed on the environment and the resources that is in it comes from anthropogenic activities. These are the activities of the people that live within the environment. The extraction of resources for the provision of energy as well as construction pts great pressure on the environment

As we look at the image, we call to mind that the the explosions in the population of human beings have put more pressure on the environment and thus made it unable to support the human population.

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Answer: its low

Explanation:

The three main approaches to the identification of unknown bacteria are as follows:Phenotypic identification, Molecular identification and Biochemical identification

1. Phenotypic identification

Phenotypic identification involves the physical and chemical characteristics of the bacterial colonies and cells. In this method, bacterial cells are studied through microscopy, their ability to grow on various types of media, cellular morphology, and other factors that are easy to observe.

2. Biochemical identification

Biochemical identification is based on the biochemical reactions of bacteria. This method involves the use of different chemical and biochemical tests to identify the bacteria. The tests are designed to identify specific enzymes or metabolic pathways. The results of the tests are then used to identify the bacteria.

3. Molecular identification

Molecular identification involves the use of DNA analysis to identify bacteria. In this method, the DNA of the bacterial cells is isolated and analyzed. This method has become popular in recent years due to its accuracy and speed.

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At one instant, the electric and magnetic fields at one point of an electromagnetic wave are perpendicular to each other.

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.There are seven types of electromagnetic waves which are arranged in order of their increasing wavelength with radio waves having highest wavelength.

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Ron Weasley should apply heat to the bottom of the test tube.

When heating a test tube, it is essential to apply heat to the bottom rather than the sides or top. The bottom of the test tube is in direct contact with the solution, which allows for efficient heat transfer. Applying heat to the sides or top of the test tube can lead to uneven heating and potential thermal stress, causing the glass to crack or shatter.

By heating the bottom, the heat is evenly distributed throughout the solution, promoting uniform temperature increase. This helps to prevent localized hotspots and ensures that the solution is heated safely and effectively. Additionally, heating the bottom allows for better control and observation of the process, as the contents of the test tube can be easily monitored.

To prevent accidents and ensure successful heating of the solution, Ron Weasley should apply heat to the bottom of the test tube. This method ensures uniform heating and minimizes the risk of thermal stress or breakage of the glassware.

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The cfm of air moving through an 8 in × 10 induct if the air velocity is 800 fpm is 444 CFM.

The CFM is the short form of Cubic Feet Per Minute and is a measurement used in calculating airflow. Given the data above about the airflow, we can obtain the required CFM in the following way;

cfm = Feet per minute * area

Area = 8 × 10 = 80 sq in

80 ÷ 144 = 0.56 sq ft

Feet per minute * area

= 800 × 0.56

= 444 CFM

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Streptococcus is the genus that is the most common resident biota of mouth surfaces

The most well known genus is Streptococcus.

Streptococcus bacterium of a genus that includes the agents of souring of milk and dental decay, and hemolytic pathogens causing various infections such as scarlet fever and pneumonia.

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Answer:

Higher percentage of runoff water is absorbed by the vegetation whereas 100 % of water runoff on the roofed area.

Explanation:

Higher percentage of runoff water is absorbed by the vegetation and very little amount of runoff water is received on the end of vegetative cover while on the other hand, 100 percent of precipitation water runoff on the surface of roofed or paved area because no water is absorbed by the roof due to its solid surface. The percentage of runoff depends on the factors such as rainfall intensity, slope, soil water storage capacity, and infiltration rate.

Answer: hello your question lacks some data attached below is the missing data

answer : T - mg = ma\(_{c}\)

Explanation:

Given that the vine has a fixed end and Tarzan's path is circular

At Tarzans lowest point the point can be expressed as shown below.

It can be expressed as : T - mg = ma\(_{c}\)

Answer:

C would be the correct answer

Answer:

It has to have a whistle device on the spout. When boiling occurs, water vapour displaces air above the water which has to escape through the whistle hence activating the required vibrations. Thereafter, the continuing supply of steam does the same job until the cook involves turns off the heat. The whistle is not made to exacting scientific standards and there is no doubt a range of pressures above which it will work it. It would be interesting to know how you observed the water boiling without using a transparent kettle.

Explanation:

hope it helps

The amount of energy required to raise the temperature of one gram of water by one celsius degree is called a calorie.

In physics, we can define it as a unit of measurement that defines the amount of energy to raise the temperature of 1 gram  of water by 1°C. Each material has its unique calorie, however by definition we use water as it is the lowest of all the elements.

Normally, calorimetry is directly linked with the thermal capacity that an element has to contain heat.

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Answer:

40.56Hertz

Explanation:

v=f×lamda( I don't have the symbol)

from the question,

v=23,000

f=?

lamda i.e wavelength=567m

therefore, 23000=f×567

divide by 567

23000/567=567f/567

40.56 Hz=f

so, f=40.56Hz

Answer:

The correct answer is option D.

Explanation:

With an increase in temperature, the particles increase kinetic energy and move quicker. The normal speed of the particles relies upon their mass just as the temperature – heavier particles move more gradually than lighter ones at a similar temperature.

The temperature increase in this system since the average kinetic energy of the particles increases and particles move quickly. And after some time the temperature of the system is lower now than it was initially.

Thus, the correct answer is option D.

The impact of the change in motion should be option D.

In the case when there is an increase in temperature, the particles should increase kinetic energy and move faster. The normal speed of the particles believes their mass is like the temperature. The temperature rises in this system because the average kinetic energy of the particles should rised and particles move faster.

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3rd and 6th row in second table do not agrees with the equation ( Force = mass * acceleration ) , rest follows the equation

There is a relation between force , mass and acceleration of the body , in a such a way that it agrees with newton's third law which is  Force = mass * acceleration

All the given data in the table follows this relation except where

mass = 150 kg

a = 0.67 \(m/s^{2}\)

F (given ) = 100 N

calculated force = ma = 150 * 0.67 =  100.5 N

mass = 300 kg

force (given) = 100 N

a = 0.33 \(m/s^{2}\)

calculated force = ma = 300 * 0.33 = 99 N

rest of the data completely follow the equation F = ma

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Answer:

Explanation:

height of one floor = 3.01 m

height of 96 floor h = 96 x 3.01 = 288.96 m

time of fall t = 12.6 s

h = 1/2 g x t²

288.96 = 1/2 x g x 12.6²

g = 3.64 m /s²

v = u + gt

v = 0 + 3.64 x 12 .6

= 45.86 m /s

velocity of impact = 45.86 m /s .

Answer:

The baking soda and citric acid mixture is common in commercial cold packs. However, once the reaction is complete, the cold pack is done. Another non-toxic chemical that can be used to generate a cold reaction is sodium acetate. ... Dissolving the crystals in water, on the other hand, is an endothermic (cold) reaction.

Explanation:

Answer:

well, hydropower is using fast-running water as a source of power to power machines or produce electricity, and using water can help make the earth a little cleaner, just like solar energy (energy from the sun). instead of using things like coal, oil, gas which is bad for the earth

Explanation:

Answer:

An atom that gains or loses an electron becomes an ion

Explanation:

Answer:

Ion

Explanation:

An atom that gains or loses an electron becomes an ion. If it gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion

Explanation:

You left out some important information.....but the bullet will fall the vertical distance ( the height)  from which it was fired.

Answer:

B is the answer

Explanation:

Magnetic fields are produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin.

Answer:

Kinetic Energy=1/2×m×v^2,Where m=mass,v=velocity. So, kinetic energy of the object=1/2×150×15^2 = 16875 kg m^2 s^-2 .

Explanation:

math lol

Answer:

k.e.

1/2 ×2×4=4

1/2×6×4=12

m.

16×2÷4=8

20×2÷4=10

a) The value of the required velocity is v(t) = t²/2 - 4t + 4e⁻⁵

b) The value of the required distance is S(t) = t³/6 - 2t² + 4e⁻⁵t + 5

c) The value of the velocity when t = 9 is approximately -28.2 m/sec

(a)To find v(t), we need to integrate a(t) first

a(t) = 2∫

a(t) dt = ∫ 2

dt = 2t + C1

Here, C1 is the constant of integration

Next, we need to integrate v(t) by substituting the value of a(t) into it

v(t) = ∫ (2t + C1)

dt= t² + C1t + C2

Here, C2 is another constant of integration

v(0) = - 4⇒ C2 = - 4

Also, given: v(t) = Vt + 4e⁻⁵

Comparing the above two equations:

v(t) = Vt + 4e⁻⁵ = t² + C1t - 4

On differentiating with respect to t, we geta(t) = 2

Therefore, we get the differential equation as:

Vt + 4e⁻⁵ = t² + C1t - 4 - - - - - - (1)

To find v(t), we need to solve this differential equation

Substituting t = 0, in (1), we get

-4 + 4 = 0 + C1(0)⇒ C1 = 0

Therefore, the differential equation becomes:

Vt + 4e⁻⁵ = t² - 4

On differentiating the above equation w.r.t t, we get:

a(t) = 2

Therefore, we get

v(t) = t²/2 - 4t + 4e⁻⁵ - - - - - - (2)

Thus, the required velocity is given by:

v(t) = t²/2 - 4t + 4e⁻⁵

Part (b) To find s(t), we need to integrate v(t) first

v(t) = t²/2 - 4t + 4e⁻⁵∫ v(t)

dt = ∫ (t²/2 - 4t + 4e⁻⁵)

dt= t²/6 - 2t² + 4e⁻⁵t + C3

Here, C3 is the constant of integration

Also, given that S(0) = 5⇒ C3 = 5

Therefore, we get

S(t) = t³/6 - 2t² + 4e⁻⁵t + 5 - - - - - - (3)

Thus, the required distance is given by:

S(t) = t³/6 - 2t² + 4e⁻⁵t + 5

Part (c) To find the velocity when t = 9We can use the value of v(t) obtained in part (a)⇒ v(9) = (9)²/2 - 4(9) + 4e⁻⁵⇒ v(9) = - 28.2 (approx)

Thus, the velocity when t = 9 is -28.2 (approx)m/sec.

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The K star has the coolest surface temperature among A, F, and K stars. Spectral classes range from hottest to coolest, with A being hotter than F and F being hotter than K. Therefore, the K star has the lowest temperature among the given options.

The temperature of a star is directly related to its spectral class. The spectral classes are labeled with letters, starting from the hottest (O) to the coolest (M). Within each spectral class, the numbers from 0 to 9 further categorize the stars, with 0 being the hottest and 9 being the coolest within that class.

Based on this classification, an A star is hotter than an F star, and an F star is hotter than a K star. Therefore, the K star has the coolest surface temperature among the three options.

It's worth noting that each spectral class covers a wide range of temperatures, and the exact temperature of a star within a class can vary. However, in general, a K star is cooler than an A or an F star.

Therefore option (c) is correct

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To calculate the observer's frequency (Fo), you need to know the source frequency (Fs), the velocity of sound (V), and the relative velocity between the source and observer (Vr). The formula for Fo is Fo = Fs x ((V + Vr)/V).

The observer's frequency (Fo) is calculated based on the Doppler effect, which is the shift in frequency that occurs when the source and observer are in relative motion. The source frequency (Fs) is the original frequency of the sound wave emitted by the source. The velocity of sound (V) is the speed at which sound travels in a given medium, such as air. The relative velocity between the source and observer (Vr) is the speed at which the observer is moving towards or away from the source. The formula for Fo takes into account all of these factors to determine the frequency that the observer will hear.

The Doppler effect is a phenomenon that occurs when the frequency of a sound wave changes due to the relative motion of the source and the observer. In this formula, positive values for vo indicate that the observer is moving towards the source, while negative values indicate that the observer is moving away from the source. Similarly, positive values for vs indicate that the source is moving away from the observer, while negative values indicate that the source is moving towards the observer.
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A spherical drop of water carrying a charge of 41pC has a potential of 570 V at its surface (with V=0 at infinity) (a) The radius of the drop is approximately 5.88 micrometers (μm).

(b) The potential at the surface of the new drop formed by combining two drops of the same charge and radius is approximately 1140 V.

(a) To find the radius of the drop, we can use the formula for the potential of a charged sphere, which is given by V = (k * Q) / r, where V is the potential, k is the electrostatic constant, Q is the charge, and r is the radius of the sphere. Rearranging the formula to solve for the radius, we have r = (k * Q) / V. Plugging in the given values of Q = 41 pC (pico coulombs) and V = 570 V, and using the value of k = 8.99 × 10^9 Nm^2/C^2, we can calculate the radius to be approximately 5.88 μm.

(b) When two drops combine to form a single spherical drop, the total charge remains the same. Therefore, the potential at the surface of the new drop can be calculated using the same formula as before, but with the combined charge. Since each drop has the same charge and radius, the combined charge will be 2 times the original charge. Plugging in Q = 82 pC (2 * 41 pC) and using the given value of V = 570 V, we can calculate the potential at the surface of the new drop to be approximately 1140 V.

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Answer:

Escape velocity is defined as the velocity which will take a body to go the infinite distance away above the surface of the earth when projected upwards.

Hope this helps...

Good luck on your assignment....

Answer:

B.  10 m

Explanation:

f = v/λ = (20 m/s)λ / (5 m) = 4 Hz    original frequency

1/2(4 Hz) = 2 Hz   half the original frequency

(20 m/s) / λ = 2 Hz

λ = (20 m/s) / (2 Hz) = 10 m

The second wavelength would increase to 10 m

Answer:

Hello, I believe it would have a negative charge considering protons have a positive charge while elctrons have a negative charge

Explanation: