Multiple star systems in our galaxy
A) are extremely rare, making up less than 1% of the total
B) are very common, making up about 50% of the total
C) are fairly common, making up around 30% of the total
D) do not exist

After watching the Ted Talk, there were still a few questions that I had about supermassive black holes. Firstly, I wanted to know more about the event horizon and what it exactly entails. Although the speaker briefly touched upon this subject, I would have appreciated a more in-depth explanation. Additionally, I would have liked to know more about the role of supermassive black holes in the universe.

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For Me Is "Hydropower."

Because Hydropower is most efficient method of generating electricity because 95 per cent of the energy of flowing water gets converted into electricity—only five per cent of the energy is converted into other forms of energy.

Answer:

Fundamental units are the units of the fundamental physical quantities in SI system. They are not formed from other units. There are a total of seven fundamental units such as meter, kilogram, ampere, and second. Derived units are those units that are used for derived quantities.

Explanation:

Hope it helps

The process of formation of the inner planets, namely from a collection of solid objects, gas, and dust that are joined in a heavy mass. During the initial process of forming a gas disc, a number of dust, gas, and other surrounding material fly in the same mass line and surround the sun like a belt.

The process of forming the outer planets is from the cooling process of several clumps that also orbit, continue to spin, and pull the sky material around them in the form of gas, dust and solid objects with their own gravity then solidify and become planets.

The Solar System is a collection of celestial bodies consisting of a star called the Sun and all objects bound by its gravitational force. The Sun is the center of the solar system. The sun is a star that is closest to the earth. Like other stars, the Sun is a hot object composed of various high-pressure gases. The sun is gigantic when compared to even the largest planet.

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Answer: Hello! Sorry if wrong........

PFA Picture for Attention

PFA Protection from Abuse

PFA Physical Fitness Assessment

PFA Paraformaldehyde

PFA Perfluoroalkoxy

PFA Professional Footballers Association

Explanation:

Mark me brainest please. Hope I helped! Hope you make an 100%

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The charge that must transfer for object A to gone positively charged is the negative charge in object A.

The physical characteristic of matter that causes it to feel a force when exposed to an electromagnetic field is called electric charge.

The two types of electric charges that protons and electrons most frequently carry are positive and negative charges. Charge movement is what produces energy.

An object can either be negatively charged or positively charged. An object is positively charged when it includes more protons than electron.

Thus, for object A to be positively charged, the charge that must shift for object A to become positively charged is the negative charge.

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Your question is incomplete, most probably your question was as below, and missing part is attach in image below.

Select the correct location on the image.

Objects A and B are brought close to each other. Object A will soon become positively charged. Identify the charge that must transfer for this situation to occur.

+

A

B

A convex lens would make the best magnifying glass. This is because a convex lens bends light in such a way that it causes the image of an object to be magnified. When light passes through a convex lens, it is refracted, or bent, towards the center of the lens. This causes the image of an object to appear larger than it actually is, which is why convex lenses are used in magnifying glasses. In contrast, a concave lens bends light away from the center of the lens, which causes the image of an object to appear smaller than it actually is. Therefore, a convex lens would make the best magnifying glass because it causes the image of an object to be magnified, whereas a concave lens causes the image of an object to be reduced.

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For saving lives  the most important safety feature on a car is B. Safety Belt

Safety features of  a car is a feature of a product designed to ensure or increase safety.

Air bag and Anti-lock brakes are the supplemental protection and designed to work best with combination with seat bells.

Air bag reduce the chance that upper body or head will strike the vehicle's interior during a crash alongside with belt that will  also hold your upper body

so, the primary safety feature is seat belt and Air bag and Anti-lock brakes  comes in secondary safety feature  as they increases the safety and risk of getting an injury during any accident

correct answer is B. Safety Belt

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Answer:

D all of these

Explanation:

Extrinsic statements originate in parents ,society and teachers. Option D is correct.

Extrinsic motivation is defined as conduct motivated by external incentives. Extrinsically driven people will continue to do something even if it isn't pleasurable or rewarding in and of itself.

These incentives might be monetary or intangible in nature, such as acclaim or renown. Extrinsic motivation is distinct from intrinsic motivation in that it is only motivated by external incentives.

Extrinsic statements originate in;

a. Parents

b. Society

c. Teachers.

Extrinsic statements originate in all of the above given option.

Hence, option D is correct.

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The applied force, F, and the friction force, f, act on the cabinet in the direction of motion (x-axis). Therefore,

F + (-f) = mg

Now, by using the formula for static friction :

f = mg

f = (0.80)(30)(9.8)

f = 235.2 kg m/s² or,

Therefore, the magnitude of the friction force is 235.2 N.

Static friction is a force that holds an object at leisure. It is the friction encountered when individuals try to move a fixed object on a surface without initiating any relative motion between the body and the surface on which it is.

A force acting on an object is static force if it does not change that particular object's size, position, or direction. The force involved in a structure acts as a load to that precise structure. This is why static force is also known as a static load.

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When a light source is present in the center of the fountain, light spots that form a circle around the outside of the fountain are observed.

In order to explain how the light makes it from the center of the fountain to the circles of light on the ground where the water hits, the following points should be considered: The water in the fountain's center captures the light's brightness and refracts it into the water droplets. This makes the water droplets illuminate in all directions. The refracted light is scattered throughout the water droplets, generating a brilliant glow that illuminates the droplets.

The illuminated droplets are then sprayed out of the fountain and into the air, where they meet the ground at a distance, creating light circles or patterns. The angle at which the water droplets meet the ground and the intensity of the light hitting them influence the size and clarity of the circles, which can be visible even when there is ambient light present. The light source in the center of the fountain provides the essential component for the creation of the light circles.

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Answer:

26b) 66.7%

27) 500 N

Explanation:

26.a) In a two pulley system, the load is attached to one of the pulleys.  The other pulley is attached to a fixed surface, as well as one end of the rope.  The other end of the rope goes around moving pulley, then around the fixed pulley.

26.b) Mechanical advantage is the ratio between the forces:

MA = load force / effort force

Efficiency is the ratio between the work:

e = work done on load / work done by effort

Work is force times distance.

e = (F load × d load) / (F effort × d effort)

Rearranging:

e = (F load / F effort) × (d load / d effort)

e = MA × (d load / d effort)

In a two pulley system, the load moves half the distance of the effort.  So the efficiency is:

e = (4/3) × (1/2)

e = 2/3

e = 66.7%

27) In a three pulley system, the load moves a third of the distance of the effort.

e = (F load / F effort) × (d load / d effort)

0.40 = (600 N / F) × (1/3)

F = 500 N

To say that two charges interact is to say that they exert forces on each other from a distance.

The electrode from which the electrons emerge is the negative terminal. It is also called the cathode. The electrode that receives electrons is the positive terminal. It is called the anode.

A negative terminal is the grounded terminal on a car battery, typically marked by a minus (-) sign. It is usually color-coded black. The other terminal is positive, usually color-coded red or orange, and marked with a plus (+) sign.

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the heat removed from the steam is 128000 J.

When steam is condensed into water, its temperature decreases from 128°C to 0°C. During this process, heat is removed from the steam and transferred to the surrounding environment. This heat transfer can be calculated using the equation:

q = m * c * ΔT

where q is the heat transferred, m is the mass of the steam, c is the specific heat capacity of water, and ΔT is the change in temperature.

For steam, the specific heat capacity is about 4.184 J/g°C. For water, the specific heat capacity is about 4.184 J/g°C as well.

Plugging in the values, we have:

q = 250 g * 4.184 J/g°C * (128°C - 0°C)

q = 250 * 4.184 * 128

q = 128000 J

Answer:

height = 1.5 x 10⁶ m = 1500 km

Explanation:

We can use the formula of gravitational force from the Newton's Gravitational Law:

\(F = \frac{Gm_{1}m_{2}}{r^2}\)

where,

F = Gravitational Force = 6.6 x 10³ N

G = Universal Gravitational Constant = 6.67 x 10⁻¹¹ N.m²/kg²

m₁ = mass of earth = 6 x 10²⁴ kg

m₂ = mass of satellite = (1.02 tons)(1000 kg/1 ton) = 1.02 x 10³ kg

r = distance between center of earth and satellite = ?

Therefore, using these values in the equation, we get:

\(6.6\ x\ 10^3\ N = \frac{(6.67\ x\ 10^{-11} N.m^2/kg^2)(6\ x\ 10^{24} kg)(1.02\ x\ 10^3\ kg)}{r^2}\\\\r^2 = \frac{(6.67\ x\ 10^{-11} N.m^2/kg^2)(6\ x\ 10^{24} kg)(1.02\ x\ 10^3\ kg)}{6.6\ x\ 10^3\ N}\\\\\)

\(r = \sqrt{61.84\ x\ 10^{12}\ m^2 }\)

\(r = 7.86\ x\ 10^6 m\)

The distance between center of earth and the satellite is equal to the sum of height of satellite and radius of earth:

\(r = height + radius\ of\ earth\\7.86\ x\ 10^6 m = height + 6.36\ x\ 10^6 m\\height = 7.86\ x\ 10^6 m - 6.36\ x\ 10^6 m\)

height = 1.5 x 10⁶ m = 1500 km

Answer:

Heat from the sun then warms the cold water at the surface, and evaporation leaves the water saltier. The warm salty water is then carried northwards; it joins the Gulf Stream, a large powerful ocean current that is also driven by winds

Explanation: The explanation is the answer

Because the number of electrons and protons in a neutral atom is the same, this atom's charge is zero.

The number of electrons in a neutral atom is the same as the number of protons. In the case of this atom, there are 19 electrons and 20 protons, resulting in a charge of +1. This atom is a cation since it has more protons than electrons.The atomic number of an element is determined by the number of protons in its nucleus, and it is represented by the symbol Z. The total number of protons and neutrons in an atom's nucleus is called its mass number, and it is represented by the symbol A. The number of neutrons in an atom can be determined by subtracting the atomic number (Z) from the mass number (A).In this particular atom, there are 20 protons and 15 neutrons. The mass number is 20 + 15 = 35. The atomic number, on the other hand, is 20. As a result, this element is a neutral atom with 20 electrons.

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Explanation:

Yes, because the object will move to the right

Answer:

Explanation:

Sometimes.

Sometimes not.

If the surface is frictionless,  and the mass is 5 kg and the object is on a table, then likely 2 N will be enough to get it going.

If the object is on a table that needs a sandpaper/stain finish, then likely the 5 kg object will not overcome the rough surface of the table and there will likely not be any motion.

If the force is 2N and the object is on a frictionless surface and the object is a 1000kg mass, there might be motion but inertia would certainly be hard to overcome and I doubt there would be motion on planet earth.

2N is just not a very big force.

The biggest advantage of using the trigonometric parallax method at a telescope on Pluto would be the ability to accurately measure the distances to nearby stars.

The trigonometric parallax method involves measuring the apparent shift in position of a star against the background of more distant stars as the observer's position changes due to the Earth's motion around the Sun.

By measuring this apparent shift in position, astronomers can determine the angle between the direction of the star and the direction of the Sun, known as the parallax angle. Using basic trigonometry, the distance to the star can then be calculated.

The trigonometric parallax method is most effective for measuring distances to stars that are relatively close to the Sun, as the parallax angle decreases rapidly with distance.

Therefore, using this method from a telescope on Pluto, which is over 5 billion kilometers away from the Sun, would allow for extremely accurate measurements of the distances to nearby stars that are otherwise difficult to measure accurately.

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Answer:

Amplitude

Explanation:

The lower the amplitude, the lower the frequency.

Effective spring constant of the musculature attached to the eyeball is 27.5 N/m

where k is the spring constant, m is the mass of the eyeball, and T is the period of vibration, which is equal to 1/frequency.

Substituting the given values:

k = (4 * pi^2 * 7.5 {\rm g}) / (1/29 {\rm Hz})^2

k = (4 * pi^2 * 0.0075 kg) / (0.0343 s^2)

k = (9.42 * 10^-6 N/m^2) / (0.0343 s^2)

k = 27.5 N/m

So the effective spring constant of the musculature attached to the eyeball is approximately 27.5 N/m (to 2 significant figures).

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Answer:

b

Explanation:

Answer:

read explanation

Explanation:

Due to this reason a gas (air) a conductor of electricity at low pressure. ... It is because when the gas is at very low pressure positive charged ions are not available to eject out the electron from the cathode hence the discharge current stops.No, vacuum cannot conduct electricity.

The linear probability model contains heteroskedasticity unless b. the independent variables are binary

What is Heteroskedasticity?

Heteroskedasticity refers to the violation of the assumption in a linear regression model that the variance of the error term is constant across all levels of the independent variables. In other words, it means that the variability of the error term is not the same for all observations.

The linear probability model is a specific type of linear regression model used when the dependent variable is binary (taking on values of 0 or 1). In this model, the assumption of constant variance (homoskedasticity) is violated unless the independent variables are binary.

When the independent variables in the linear probability model are binary, the error term's variance is constant for each level of the binary variables. This ensures that heteroskedasticity is not present in the model.

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The initial velocity of the car as it slow to rest with an acceleration of -5 m/s² is 11.5 m/s.

This can be defined as the ratio of displacement to the time of a body

To calculate the initial velocity of the car, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence the initial velocity of the car is 11.5 m/s

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The ball will decelerate as it moves upwards.

The magnitude of the ball's acceleration is 0.3 m/s² and it directed backwards.

The given parameters;

As the ball rolls up the inclined plane, the velocity decreases and eventually becomes zero when the ball reaches the highest point of the plane.

Thus, the ball decelerate as it moves upwards.

The acceleration of the ball is calculate as;

\(a = \frac{v_f -v_0}{t} \\\\\)

at the highest point on the incline plane, the final velocity \(v_f\) is zero

\(a = \frac{0-1.25}{4.22} \\\\a = -0.3 \ m/s^2\)

Thus, the magnitude of the ball's acceleration is 0.3 m/s² and it directed backwards.

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Answer:

Positive work is said to be done when the force acting on a body produces a displacement in the direction of the force. Negative work is said to be done when the force acting on a body produces a displacement opposite to the direction of the force

Explanation:

When the displacement of the body the in the direction of the force then the work done is positive. For example :- a man pushing a car in a straight path.

When the displacement is in a direction opposite to the direction of the force then the work done is said to be negative. For example :- work done by the friction.