The center of a 910 kg satellite is 9.9 x1O^6 m from Earth's center. What is 51 the gravitational force between the satellite and Earth? * o 4.5 x10^3 N o 3.7 x10^3 N
o 8.9 x10^3 N o 1.7 x10^6 N o force between the satellite and Earth

If the elevator rises with an acceleration of 0.5 meters per second^2, the force exerted by the elevator on the man will be equal to the man's weight, which is 800 Newtons.

This is because the force exerted by the elevator on the man is equal to the man's mass multiplied by the acceleration of the elevator. In this case, the mass of the man is equal to his weight divided by the acceleration due to gravity, which is approximately 9.81 meters per second^2.

Therefore, the force exerted by the elevator on the man will be equal to his weight, which is 800 Newtons.

The correct answer is: 800 N

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When a neuron is at resting potential, the state of the electrical charge is negative inside the neuron compared to the outside

Because of an unequal distribution of ions like potassium (K+) and chloride (Cl-) inside and outside the neuron, the interior of the neuron is negatively charged at resting potential. The membrane of the neuron is selectively permeable, permitting certain ions to pass while preventing others from doing so. A gradient in electrochemistry results from this.

Ion channels, notably the sodium-potassium pump, which actively transfers sodium ions (Na+) out of the neuron and potassium ions (K+) into the neuron, are responsible for maintaining the resting potential. As a result, the neuron produces an excess of negative charge within and an excess of positive charge outside.

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Answer:

30 meters

Explanation:

because that's is where the points meet

Answer:

when the time is three seconds it will be 30 m

Explanation:

The distance between corresponding points on a wave's cycle is called its wavelength.

The wavelength of a wave is the distance between two corresponding points on the wave, such as the distance between two peaks or two troughs. It is usually measured in meters, centimeters, or nanometers, depending on the type of wave. The wavelength of a wave is related to its frequency and speed by the equation: wavelength = speed / frequency. The wavelength is an important characteristic of a wave, as it affects its properties such as diffraction, reflection, and interference.

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To continue testing his hypothesis, Neil should repeat the experiment, but only wait 20 seconds before testing the comb's attractive effects.

In a controlled experiment, all other factors are held constant with the exception of one. One or more other groups are studied with all conditions being the same as the control group and each other except for one variable. Typically, a collection of data is considered to be the control group, which is often the normal or usual state.

Comparing a control group to an experimental group is a popular form of controlled experiment. The factor being examined is the only difference between the two groups' variables.

A controlled experiment has the benefit of making it simpler to determine whether the results are meaningful.

Imagine you want to know if the type of soil influences how long it takes a seed to germinate and you choose to conduct a controlled experiment to find out. Five similar pots might be used, each filled with a different kind of soil, and each with identical bean seeds. The pots could then be placed in a sunny window, watered equally, and the time it takes for the seeds in each pot to sprout could be recorded.

This is a controlled experiment because the only variable that will change is the kind of soil you use. You are in charge of these options.

Here in given case Neil's goal is to find out how quickly charge dissipate in humid air. So he should try his hypothesis by varying wait time.

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Answer:

Harmful bacteria are called pathogenic

Explanation:

Harmful bacteria are called pathogenic bacteria because they cause disease and illnesses like strep throat, staph infections, cholera, tuberculosis, and food poisoning.

White light is passed through a cloud of cool hydrogen gas and then examined with a spectroscope. The dark lines observed on a bright (coloured) background are caused by (d) hydrogen absorbing certain frequencies of the white light.

As the white light passes through a cloud of cool hydrogen gas, certain photons with the same amount of energy as the difference between two levels in the hydrogen atom are absorbed by the hydrogen gas. The energy level difference corresponds to a specific frequency or wavelength of light.

After the hydrogen atoms absorb the photons, they become excited and move to higher energy levels. Because these photons are absorbed, they are missing from the white light spectrum, resulting in a dark line in the absorption spectrum.

This absorption spectrum's dark lines indicate that certain colors or wavelengths of light are missing due to hydrogen absorption.

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Due to the unequal distribution of electrons among the atoms and the asymmetrical shape of the molecule, a water molecule has two poles: a positive charge on the hydrogen pole (side) and a negative charge on the oxygen pole (side).

Water is polar despite having a zero net charge due to the structure of its molecules. The molecule's hydrogen ends are positive, and its oxygen ends are negative. Water molecules are drawn to other polar molecules and to one another as a result.

The oxygen atom draws electrons in the covalent link between oxygen and hydrogen a little bit more strongly than the hydrogen atom.

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Answer:

Strong base

Explanation:

A strong base usually has the pH of between 12 to 14

If the pH of a solution is 12.4, the substance is called a Strong base. Hence, option C is correct.

When a substance is dissolved in water, H⁺ hydrogen ions are formed. These substances are called Acids. H⁺ ions are positive ions and hence, they donate protons to other substances.

When a substance is dissolved in water, OH⁻ hydroxyl ions are formed. These substances are called Bases. OH⁻ ions are negative ions that are capable of accepting the protons/hydrogen ions.

Acids are substances having more hydrogen ions than hydroxyl ions and it has a sour taste. Bases are substances having more hydroxyl ions than hydrogen ions and it has a bitter taste.

The acids and bases are differentiated by using the pH scale. pH represents the potential of hydrogen which measures the hydrogen and hydroxyl ions. It is a negative logarithm of H⁺ ion concentration.

The pH scale ranges from 0-14. The neutral power in the pH scale is 7 and the water shows the neutral range. If pH shows less than 7 it is an acidic solution and litmus paper turns red.        

If pH shows greater than 7, it is a base or alkaline solution and the litmus paper turns blue.  Weak bases range from 7.3-10. Strong bases range from 10-14.  

Hence, the pH shows 12.4, which represents a strong base. Thus, the correct solution is C.  

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Answer:

The answare is it ensures that any leakage of current to the metallic body of the appliance keeps its potential to that of the earth, and the user may not get a severe electric shock.

Answer:

Explanation:

A simple pendulum consists of a mass (usually represented as a small object or bob) attached to a string or rod of negligible mass. The mass is free to swing back and forth under the influence of gravity.

In the figure, the point of suspension is denoted by "O," and the mass (bob) is represented by the small circle. The string or rod is represented by the vertical line connecting the point of suspension to the bob.

Amplitude:

The amplitude of a pendulum refers to the maximum displacement or swing of the bob from its equilibrium position. In the figure, the amplitude can be represented by the angle formed between the vertical position and the position of the bob when it swings to its maximum distance on one side. It is usually denoted by the symbol "A."

Effective Length:

The effective length of a pendulum refers to the distance from the point of suspension to the center of mass of the bob. It represents the distance over which the mass swings back and forth. In the figure, the effective length can be measured as the length of the string or rod from the point of suspension to the center of the bob. It is usually denoted by the symbol "L."

It is important to note that the amplitude and effective length of a simple pendulum affect its period of oscillation (the time taken for one complete swing). The relationship between these parameters and the period can be described by mathematical formulas.

Overall, the simple pendulum is a fundamental concept in physics and provides a simplified model for understanding oscillatory motion and the principles of periodic motion.

In order to calculate the reading R of the scale and the upward velocity v of the elevator, we can use Newton's second law of motion, The reading R of the scale is approximately 735 N, and the upward velocity v of the elevator at the end of the 3 seconds is approximately 31.62 m/s.

The reading R of the scale:

The reading on the scale is equal to the normal force exerted by the man on the scale, which is also the force exerted by the scale on the man. In this case, the normal force is equal to the weight of the man.

Weight = mass * acceleration due to gravity

Weight = 75 kg * 9.8 m/s^2

Weight ≈ 735 N

Since the scale is a spring scale, it measures the force exerted on it. Therefore, the reading R of the scale is equal to the weight of the man, which is approximately 735 N.

Finding the upward velocity v of the elevator:

The velocity, we need to determine the acceleration of the elevator during the first 3 seconds. We can use the following equation of motion:

Final velocity = Initial velocity + (acceleration * time)

Since the elevator starts from rest, the initial velocity is 0 m/s. The acceleration can be calculated using Newton's second law of motion:

Net force = mass * acceleration

Tension - Weight = mass * acceleration

8300 N - 735 N = 750 kg * acceleration

Acceleration ≈ 10.54 m/s^2

Now, we can calculate the final velocity of the elevator using the equation of motion:

Final velocity = 0 + (10.54 m/s^2 * 3 s)

Final velocity ≈ 31.62 m/s

Therefore, the reading R of the scale is approximately 735 N, and the upward velocity v of the elevator at the end of the 3 seconds is approximately 31.62 m/s.

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The special theory of relativity predicts that fast-moving objects will appear to be shorter along the direction of motion than when they are seen at rest. Option B is the correct answer.

According to Einstein's theory, an item contracts more in the direction of motion the quicker it moves. This effect is not perceptible in our ordinary experiences since it is only perceptible at speeds that are a considerable fraction of the speed of light. Option B is the correct answer.

A fundamental theory of physics known as the special theory of relativity describes how the rules of physics apply to things moving quickly. The most well-known prediction of the theory is that no matter how quickly the observer is travelling in relation to the light source, the speed of light stays constant in all reference frames. Numerous tests have verified this prediction, which is now regarded as one of the foundations of contemporary science.

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The complete question is, "The special theory of relativity predicts that fast-moving objects will appear to be ______than when they are seen at rest:

a. fatter

b. shorter along the direction of motion

c. stretched out along the direction of motion

d. older

e. less massive"

The magnitude of the gravitational acceleration on this planet is 11.8 m/s²

How can the magnitude of the gravitational acceleration be determined?

On earth, gravity causes an acceleration of 9.8 m/s2.

G = GM/r2 is the formula used to calculate the acceleration caused by gravity.

The gravitational field on Earth has a strength of 9.8 or 10.

The Earth's gravitational field has a strength of 9.8 N/kg.

Accordingly, for every kg of mass, an object will experience 9.8 N of pressure.

If the gravitational field is weaker, the object has a lower weight.

Solving this for g:

g = (4p^2*L)/P^2.

I am assuming that the pendulum as a length of 49.0 m and that the pendulum completes 104 full swings in 133 s.

Since the pendulum completes 104 full swings in 133 s:

P = 133/104 s.

Then, given that L = 49.0 m:

g = (4p^2*L)/P^2

= [4p^2*(49.0 m)]/(133/104 s)^2

= 1.18 x 10^3 m/s^2.

This value of g seems rather large. Did you happen to have 49.0 cm = 0.49 m? If so, then:

g = (4p^2*L)/P^2

= [4p^2*(0.49 m)]/(133/104 s)^2

= 11.8 m/s^2.

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Gamma rays

each section of the electromagnetic spectrum has characteristics energy level, wavelength and frequencies association with it's photons

Answer:

Atom has become a cation.

Atom has lost 2 electrons.

Explanation:

Based on the ionic notation of the element or ion given, we can clearly state that the atom has become a cation and it has lost two electrons.

A cation is an atom that has lost electrons to become positively charged.

In a neutral atom, the number of protons and electrons are the same.

Protons are the positively charged particles within an atom.

Electrons are the negatively charged particles.

 When an atom loses electrons, it becomes positively charged because the number of electrons is now more.

Positively charged atoms are called cations.

Object recognition is a major function of perception.

Perception is the organization, identification, and interpretation of sensory information in order to represent and understand the presented information or environment.

In other words, perception is the act of perceiving or the ability to perceive; mental grasp of objects, qualities, etc. by means of the senses; awareness; comprehension.

There are five sub-division of perception and they include;

Thus, we can conclude that perception entails to ability to recognize objects. So the the right or correct word that will complete the sentence is perception.

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The type of galaxy which has arms that contain sites of active star formation and start close to a bulge in the center is: D. normal spiral.

A star can be defined as a giant celestial (astronomical) object that is made up of a luminous sphere of plasma bounded together by its own gravitational force.

Generally, a star comprises two (2) main interstellar hot gases and these include:  

I. Hydrogen (H).

II. Helium (He).

A galaxy refers to a collection of billions of stars, which are existing independently.

This ultimately implies that, the greatest number of stars are found in a galaxy.

According to astronomers, the galaxy is classified into four (4) main categories and these are:

Furthermore, spiral galaxies are divided into two (2) major groups such as:

I. Barred spiral.

II. Normal spiral.

A normal spiral is typically made up of arms containing sites of active star formation and it start close to a bulge in the center.

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Answer:

D) normal spiral

Explanation:

Whoever answered it practically wrote a life story. There's no need for an explanation; just get to the point and tell us the answer. But anways, the answer is D.

The photocurrent in the photoconductor is proportional to the square of the incident photon flux density (K) due to two-photon absorption, and the responsivity (R) is given by R = K^2 * A, where A is the area of the detector's illuminated surface.

The physical origin of the photocurrent in the given scenario is the absorption of photons by the photoconductor material. When photons with energy greater than the bandgap energy (Eg) but less than twice the photon energy (2hv) are incident on the photoconductor, they can be absorbed by exciting electrons from the valence band to the conduction band, creating electron-hole pairs.

The square dependence on K in the photocurrent density equation (Jp = K^2) arises due to the probability of two-photon absorption events. The incident photon flux density, K, represents the number of photons incident on the detector per unit area per unit time.

Since two-photon absorption requires the simultaneous absorption of two photons, the probability of this event is proportional to the square of the incident photon flux density, resulting in the square dependence of the photocurrent on K.

To derive an expression for the responsivity of the photoconductor, we need to relate the photocurrent density (Jp) to the incident power (P) and the area of the illuminated surface (A) of the detector. The responsivity (R) is defined as the ratio of the photocurrent (I) to the incident power, which can be expressed as:

R = I / P

Since the photocurrent density (Jp) is given as Jp = K^2, we can write the photocurrent (I) as:

I = Jp * A

Substituting Jp = K^2 and rearranging, we have:

I = K^2 * A

Now, substituting the value of incident power (P) into the equation, we get:

I = (K^2 * A) * P

Finally, we can express the responsivity (R) in terms of K, hv, P, and A as:

R = I / P = (K^2 * A * P) / P = K^2 * A

Therefore, the responsivity (R) of the photoconductor is directly proportional to the square of the incident photon flux density (K), the area of the illuminated surface (A), and the incident power (P).

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Answer:

Yes

Explanation:

Rubbing a balloon with wool cloth will create static electricity charges. If you place small pieces of tissue paper near the balloon in Picture 2, they would probably stick to the balloon.

Answer:

The tractor applies 1,748.418 N to the plow.

Explanation:

Net Force

According to the second Newton's law, the net force exerted by an external agent on an object of mass m is:

Fn=m.a

If the acceleration is zero, then the net force is also zero. That means all forces acting on the mass are balanced.

The tractor drags the m=313 Kg plow at a constant speed, thus the acceleration is zero and so is the net force.

The horizontal forces acting on the plow are:

Since both forces are balanced, then:

Ft=Fr

The friction force is calculated as:

\(Fr=\mu \cdot N\)

Where \(\mu\) is the coefficient of friction between the plow and the ground and N is the normal force. In the situation described, the normal force is equal to the weight of the plow:

\(N=W=m.g=313*9.8=3,067.4\)

The normal force is N=3,067.4 N

The friction force is now calculated:

\(Fr=0.579 \cdot 3,067.4\ N\)

\(Fr=1,748.418\ N\)

Thus, the tractor applies 1,748.418 N to the plow.

When lightning strikes the ground, it is the result of a buildup of static electricity within clouds.

Clouds are formed of water droplets and ice crystals that move in the atmosphere, and as they move, they can rub against one another, causing electrons to be transferred between them. This results in the buildup of a significant electrical charge within the clouds.

When the electrical charge within the clouds becomes sufficiently large, it can overcome the resistance of the air and create a pathway to the ground in the form of a lightning bolt. As the lightning bolt travels towards the ground, it ionizes the air, stripping electrons from atoms and molecules in its path. This creates a highly conductive plasma channel that allows the lightning bolt to travel more easily.

When the lightning bolt reaches the ground, it can transfer its electrical charge to the ground, creating a flow of electrons from the cloud to the ground. This flow of electrons results in an electric current that can cause damage to anything in its path, including trees, buildings, and other structures. The transfer of electrons from the cloud to the ground is what causes the ground to become negatively charged during a lightning strike.

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Answer:

it would

Explanation:

this is because as something rubs against a surface fast, friction heats it up, like when you rub a surface fast and it gets warm on the palm of your hand, that is friction. hope it helped :)

One key difference between living on earth and in space is the effect of gravity on the human body. On earth, gravity provides a constant force that keeps our bones and muscles strong. In space, however, gravity is much weaker and astronauts experience weightlessness. This can lead to various health problems, such as bone loss, muscle atrophy, and fluid shifts. Therefore, astronauts need to exercise regularly and follow a balanced diet to maintain their physical and mental well-being.

Gravity is a natural phenomenon whereby everything that has mass or energy in the universe—including planets, stars, galaxies, and even light—attracts one another.

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Answer:

Explanation:

False.

There are also fields -- gravitational, electromagnetic...

Answer:

A surface wave is a wave that travels on the crust of the earth after an earthquake; surface waves cause the destruction of an earthquake

Explanation:

A surface wave is a wave that travels on the crust of the earth after an earthquake; surface waves cause the destruction of an earthquake

The environmental lapse rate refers to the rate at which the temperature decreases with increasing altitude in the Earth's atmosphere under calm, clear-sky conditions, generally around 6.5°C per 1000 meters.

In physics, the term "lapse rate" generally refers to the rate at which a physical quantity, such as temperature or pressure, changes with respect to altitude or depth. The environmental lapse rate is one specific example of this, referring to the change in temperature with altitude in the Earth's atmosphere.

The concept of lapse rate is particularly important in atmospheric physics, as it is a key factor in determining the stability and dynamics of the atmosphere. A stable atmosphere is one in which the lapse rate is relatively low, meaning that the temperature decreases only slowly with altitude. In an unstable atmosphere, the lapse rate is high, meaning that temperature decreases rapidly with altitude. This can lead to convective activity, such as thunderstorms or updrafts, which can have significant impacts on weather and climate.

Lapse rates can also be important in other areas of physics, such as in the study of fluids or the behavior of materials under different conditions.

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