A star is approximately a blackbody. Use Stefan-Boltzmann's law to calculate the power output of a star that has a radius of 695 million meters and a surface temperature of 5778 K. (Please note that l

Answer:

1.26 m/s²

Explanation:

Given:

Δx = 172 m

v₀ = 17.3 m/s

v = 27.1 m/s

Find: a

v² = v₀² + 2aΔx

(27.1 m/s)² = (17.3 m/s)² + 2a (172 m)

a = 1.26 m/s²

Answer:

800 joules

Explanation:

In physics, work is defined as

F = W x d (change)

Where  is the word done,  is the force that move the object and  is the change of the position of the object.

In this case, we have

F = 200 N

d= 6m - 2m = 4m , remember that the difference refers to the actual subtraction between the final point and the initial point of the object.

Replacing these values, we have

W = 200 N x 4m

W = 800 joules

Answer:

is there a picture? so I can understand it more and it will be easier for me to answer. thank you

Answer:

The second one is more accurate because we were able to draw more precisely and accurately, the first picture was more of a general idea of the picture and the second picture was more of a detailed version.

Explanation:

I just did this assignment and this is what I turned in so yeah I hope this is good enough, if you need more of an explanation though ill try to lengthen it. =]

Answer:

D

Explanation:

The density of a Paramecium sp. culture can be determined by using a counting chamber or a hemocytometer to count the number of Paramecium cells in a known volume of the culture.

To determine the density of a Paramecium sp. culture, follow these steps:

1. Sample Collection: Take a representative sample from the Paramecium sp. culture. Ensure that the sample is well-mixed to obtain a representative composition.

2. Sample Preparation: Take a known volume of the sample, for example, 1 mL, and transfer it to a counting chamber or a hemocytometer. These devices have grids or ruled areas that allow for accurate counting of cells.

3. Cell Counting: Observe the sample under a microscope and count the number of Paramecium cells within a specific area of the counting chamber. Repeat the counting process multiple times to ensure accuracy and obtain an average count.

4. Calculation: Calculate the density of the Paramecium sp. culture using the formula: Density = Number of cells counted / Volume of sample. The volume of the sample should be converted to a common unit, such as cells per milliliter (cells/mL).

5. Data Analysis: Analyze the obtained density value to understand the concentration of Paramecium cells in the culture. This information can be useful for various purposes, such as monitoring the growth or health of the culture or conducting further experiments or research involving Paramecium sp.

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Answer:

2000

Explanation:

well it is just   20 * 100 = 2000 v

Answer:

Object distance should be 48

Explanation:

in pic

_____________________________

(hope this helps can I pls have brainlist (crown)☺️)

Purchasing uses information from the  sales order plan to place purchase orders for raw materials with qualified suppliers.

The term purchasing has to do with the process of the buying of goods and services. The process of purchasing a very essential part of the business venture such that in some areas, an entire department may be devoted to the coordination of the processes involved in purchasing in the establishment.

A purchasing manager may be given the task of seeing to the coordination of the entirety of all the purchasing activities.

Thus, we could see that purchasing is a chain of activities that is based on the principles of demand and supply.

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(a) Push down harder on the pedals of a bicycle when first starting out than when moving at constant speed it is because of the 1st and 2nd law of motion.

(b) Need to pedal at all when cycling at constant speed because bicycle slows down and comes to rest due to the frictional force.

Unless acted on by an unbalanced force, an object at rest remains at rest, while an object in motion continues in motion at constant speed and in a straight path. The acceleration of an item is determined by its mass and the amount of force applied.

Use Newton's First and Second Law of Motion:

(a) The bicycle is at rest initially, in order to accelerate from rest, the net force must be greater than zero. When moving at constant speed net force equal to zero. Now when first starting to move it is necessary to overcome the static friction which is larger than kinetic friction.

(b) The net force acting on the object moving with constant speed is zero. So on bicycle also the net force is zero with constant speed. The bicycle slows down and comes to rest due to the frictional force. So at constant speed bicycle needs to be paddled when cycling.

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Answer:

DMs are not accessible anymore. I assume Zuka is a staff member? the only way to talk to a staff member anymore is to report something, but even then, the probably won't even look at what they're deleting :/

May I have brainliest please? :)

Answer:

each spring will extend 0.049 m / 2 = 0.024 m.

Explanation:

The total spring constant of the two springs in series is 150 N/m (50 N/m + 100 N/m). The extension of the two springs can be calculated using Hooke's law:

F = kx

where F is the force applied to the spring (in this case, the weight of the 0.50 kg mass), k is the spring constant, and x is the extension of the spring.

So, x = F / k = (0.50 kg * 9.8 m/s^2) / 150 N/m = 0.049 m

This is the total extension of the two springs combined. To find the extension of each spring, we need to divide the total extension by the number of springs. Since there are two springs in series, each spring will extend 0.049 m / 2 = 0.024 m.

In the center-of-mass frame, the two Jupiter-sized planets are initially at rest and located 1.0 × 10^11 m apart.

In the center-of-mass frame, the total momentum of the system remains constant. Initially, the momentum is zero since both planets are at rest. As the planets move towards each other due to gravitational attraction, their speeds increase. When they collide, their total momentum remains zero, but now they have opposite velocities.

The conservation of gravitational potential energy can be used to find their speeds at the moment of collision. The gravitational potential energy of the system decreases as the planets move closer together. This decrease in potential energy is converted into kinetic energy, resulting in an increase in their planets.At the moment of collision, all the initial potential energy is converted into kinetic energy.

By applying the conservation of energy principle, we can equate the initial gravitational potential energy to the final kinetic energy. Using the equation for gravitational potential energy, G(m1m2)/r, where G is the gravitational constant, m1 and m2 are the masses of the planets, and r is the distance between their centers, we can solve for the final velocities. The sum of their kinetic energies, given by (1/2)m1v1^2 + (1/2)m2v2^2, is equal to the initial potential energy. Solving these equations simultaneously will provide the speeds of the planets when they collide.

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There are 9 square feet in a yard.

A yard is a unit of measurement in the Imperial system that is used to measure length or distance. It is equal to three feet or 36 inches. However, when it comes to measuring an area, we have to multiply the length and width to get the area in square feet.

Therefore, a square yard has an area of 9 square feet. This conversion is commonly used in measuring the size of a lawn or garden. Knowing how many square feet are in a yard is essential for homeowners who want to buy sod, fertilizer, or other lawn care products.

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Answer:

hope helps

Explanation:

In a weightless environment a force of 5 Newtons is applied horizontally to the right on a rock with a mass of 1 kg and to a pebble with a mass of 0.1 kg.

Answer: 2km/m/s/s

Explanation:

10km divided by 5m/s/s = 2km/m/s/s

Answer:

Explanation:

The picture is cut off so the wrecking ball and its path are not shown. It would be better if the whole picture is available.

Based on the written info, at the bottom of the path, the wrecking ball is moving at 10m/s.

The centripetal acceleration = velocity^2 / radius

= 10^2 / 25

= 100 / 25

= 4m/s^2

The centripetal force = mass * centripetal acceleration

= 600*4

= 2400N

As the ball is moving horizontally at the bottom, net vertical force is zero.

So Tension force in cable = Wrecking ball weight + Centripetal force

= 600*g + 2400

= 6000 + 2400; assuming g is 10m/s^2

= 8400N

The magnetic field strength at a location on the axis of the coil, situated 0.70 m away from the center, is 2.0 × 10-4 T. At a distance of 0.70 m from the center of the coil, the field magnitude decreases to 1/8 of its value at the center.

(a) Here, the coil consists of 50 circular loops of radius r = 0.50 m and carries a current of I = 4.0 A. We need to find the magnetic field B at a point along the axis of the coil, 0.70 m from the center. The magnetic field at a point on the axis of a circular loop can be given by the formula:

\($$B=\frac{\mu_0NI}{2r}$$\) Where,

\($$\mu_0 = 4\pi × 10^{-7} \ \mathrm{Tm/A}$$\) is the permeability of free space.N is the number of turns in the coil. Here, N = 50. The radius of each circular loop in the coil is 0.50 m, and the current flowing through each turn is 4.0 A.

By plugging the provided values into the formula, we obtain the following result:

\($$B=\frac{(4\pi × 10^{-7}\ \mathrm{Tm/A}) × 50 × 4.0\ \mathrm{A}}{2 × 0.50\ \mathrm{m}}$$\)

\($$\Rightarrow B = 2.0 × 10^{-4}\ \mathrm{T}$$\)

Therefore, the magnetic field at a point along the axis of the coil, 0.70 m from the center is 2.0 × 10-4 T.

(b) Along the axis, the magnetic field of a coil falls off as the inverse square of the distance from the center of the coil. Let the distance of this point from the center be x meters. Therefore, the field at this point is given by:

\($$\frac{B_0}{8}=\frac{\mu_0NI}{2\sqrt{x^2+r^2}}$$\)

Here, B0 is the field at the center of the coil. From part (a), we know that,

\($$B_0=\frac{\mu_0NI}{2r}$$\)

\($$\Rightarrow B_0=\frac{(4\pi × 10^{-7}\ \mathrm{Tm/A}) × 50 × 4.0\ \mathrm{A}}{2 × 0.50\ \mathrm{m}}$$\)

\($$\Rightarrow B_0 = 2.0 × 10^{-4}\ \mathrm{T}$$\)

Substituting the values of B0 and I in the above equation and solving for x, we get:

\($$\frac{2.0 × 10^{-4}\ \mathrm{T}}{8}=\frac{(4\pi × 10^{-7}\ \mathrm{Tm/A}) × 50 × 4.0\ \mathrm{A}}{2\sqrt{x^2+0.50^2\ \mathrm{m^2}}}$$\)

\($$\Rightarrow 2.5 × 10^{-5}\ \mathrm{T}=\frac{(4\pi × 10^{-7}\ \mathrm{Tm/A}) × 50 × 4.0\ \mathrm{A}}{\sqrt{x^2+0.50^2\ \mathrm{m^2}}}$$\)

Solving for x, we get:

\($$x=\sqrt{\frac{(4\pi × 10^{-7}\ \mathrm{Tm/A}) × 50 × 4.0\ \mathrm{A}}{2.5 × 10^{-5}\ \mathrm{T}}^2-0.50^2\ \mathrm{m^2}}$$\)

\($$\Rightarrow x = 0.70\ \mathrm{m}$$\)

Therefore, the distance from the center of the coil at which the field magnitude is 1/8 as great as it is at the center is 0.70 m.

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The development of our current model of the atom evolved over centuries, starting with the ancient Greeks' conceptualization of the atom as an indivisible particle.

Around the fifth century BCE, the Greeks became the first people to put forth the idea of the atom. Democritus and other philosophers proposed the idea that matter is made up of tiny, indivisible pieces called atoms, but there was no experimental support for this theory at the time. Although it survived for centuries, this idea did not significantly change until the 19th century.

Scientific developments in the 19th century led to a deeper comprehension of atoms. With notable contributions from Michael Faraday's work on electromagnetic induction and Benjamin Franklin's electricity tests, scientists discovered the presence of electrical charges.

Groundbreaking investigations that transformed our understanding of the atom took place in the early 20th century. The electron, a negatively charged particle inside the atom, was discovered in 1897 as a result of J.J. Thomson's cathode ray tube studies. Atoms are shown to have a small, dense, positively charged nucleus that is around by negatively charged electrons in a large empty region by Ernest Rutherford's gold foil experiment in 1911.

The Rutherford model, sometimes known as the planetary model, was created in response to the discovery of the nucleus. This model, however, encountered problems since it was unable to explain the stability of atoms and the behavior of electrons. Researchers like Werner Heisenberg and Erwin Schrödinger made significant contributions to the development of quantum mechanics in the 1920s and 1930s.

The wave-particle duality and quantum mechanical concepts are both included in the current model of the atom, also referred to as the quantum mechanical model. In orbitals, which are areas of probability where electrons are most likely to be located, it says that electrons exist. Around the nucleus, these orbitals are arranged into energy levels or shells. The behavior of subatomic particles like protons and neutrons, which make up the nucleus, is also taken into consideration by the model.

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Answer:

Electric and magnetic fields:

Maxwell's equations tell us that

a changing magnetic field creates a changing electric field      and

a changing electric field creates a changing magnetic field

simple methods to carry a sufferer encompass the four-hand seat, backpack carry, ski pole or tree limb backpack carry, and coiled rope seat. In the first method, two rescuers interlock hands. Each rescuer first grasps his right wrist with his left hand.

Direct relationship is present between the number of loops and the current produced.

There is direct relationship between the number of loops and the current produced because if loops increases the current also increases. If adding more loops to the circuit, it will increase the voltage,

So we can conclude that direct relationship is present between the number of loops and the current produced.

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If the speed of the magnet is doubled, the induced voltage will be four times as great.

According to Faraday's Law of Electromagnetic Induction, the magnitude of the induced voltage in a coil is directly proportional to the rate of change of magnetic flux through the coil. When the speed of the magnet is doubled, the rate of change of magnetic flux through the coil also doubles, resulting in a doubling of the induced voltage.

However, since the induced voltage is directly proportional to the rate of change of magnetic flux, a doubling of the speed of the magnet results in a fourfold increase in the rate of change of magnetic flux, which leads to a fourfold increase in the induced voltage. Therefore, if the speed of the magnet is doubled, the induced voltage will be four times as great. This effect is important in many applications, such as electrical generators, where the speed of the rotor is used to control the output voltage of the generator.

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It takes 13.1 seconds for a swimmer with a power output of 275 watts to accomplish 3600 J of work. If she applied a 650 N force during that time with the same power output, she would have swam up to 5.54 meters.

In physics, power is the amount of energy that is converted or delivered in a given amount of time. The unit of power is the watt, which in the International System of Units is equivalent to one joule per second. In ancient literature, power is occasionally referred to as activity. A scalar quantity is power.

We know that

power = work / time

⇒ time = work / power

= 3600 / 275  = 13.1 seconds

Thus, It takes 13.1 seconds for a swimmer with a power output of 275 watts to accomplish 3600 J of work.

We also know that

power = (force × distance) / time

⇒ distance = (power × time) / force

= (275 watts × 13.1 seconds) / 650 N

= 5.54 meters

Thus, If she applied a 650 N force during that time with the same power output, she would have swam up to 5.54 meters.

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If two marbles of the same mass collide and stick together, angle between the displacement vectors after the crash should be 90 degrees. This is because the momentum of the system is conserved in a collision, and the momentum is a vector quantity.

In a two-dimensional collision, momentum of each marble can be represented as a vector, with magnitude equal to the product of its mass and velocity, and direction equal to the direction of its velocity. After collision, the total momentum of the system is the sum of the momentum vectors of the two marbles, which can be represented as a resultant vector. Angle between resultant vector and vectors representing initial momentum of each marble should be 90 degrees.

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Answer:

Please refer the the definition of an electric current below

Explanation:

Electric current is the flow of electric charge in a circuit. It is defined as the rate at which electric charge flows through a given area of a conductor. The flow of electric charge is caused by the motion of electrons, which are negatively charged particles that exist in most materials.

Electric current is generated by applying a potential difference, or voltage, across a conductor. The voltage causes a difference in electric potential energy between the ends of the conductor, and this difference drives the flow of electrons through the conductor. The electrons move from the negative terminal of the voltage source towards the positive terminal, and as they move, they transfer energy to the conductor in the form of heat or light.

The amount of current that flows through the conductor is determined by the voltage applied and the resistance of the conductor. Resistance is a property of the conductor that resists the flow of current, and it is measured in ohms. According to Ohm's law, the current in a circuit is directly proportional to the voltage and inversely proportional to the resistance.

This relationship can be expressed as

\(\sf I=\dfrac{V}{R}\)

where
\(\sf I\) is the current in amperes

\(\sf V\) is the voltage in volts

\(\sf R\) is the resistance in ohms

The parts of the frontal lobe that fire when performing certain actions or when observing another doing so are called mirror neurons.

These are a type of brain cells that activate both when an individual performs a specific action and when they observe another person performing the same action.

They play a crucial role in understanding and imitating the actions of others, as well as in empathy and social cognition.

These are believed to be involved in various processes, such as motor imitation, empathy, language development, and understanding the intentions and emotions of others.

They contribute to our ability to learn through observation and mimicry, facilitating social interaction and communication.

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The type of galaxy that has a stellar disk but without gas and dust is an **elliptical galaxy**.

Elliptical galaxies are characterized by their smooth and featureless appearance, lacking the distinct spiral arms seen in disk galaxies like the Milky Way. They are composed mostly of old stars and have little to no ongoing star formation. As a result, they have depleted their interstellar gas and dust reservoirs over time, leaving behind primarily stellar populations. Elliptical galaxies can vary in size from small to massive, and their shape ranges from nearly spherical to elongated ellipsoids. They are commonly found in dense regions of galaxy clusters, where interactions and mergers between galaxies have stripped away their gas and disrupted their original disk structures.

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Answer: Any particle, whether an atom, molecule or ion, that contains less electrons than protons is said to be positively charged. Conversely, any particle that contains more electrons than protons is said to be negatively charged.

Explanation: If there are more electrons than protons in a piece of matter, it will have a negative charge, if there are fewer it will have a positive charge, and if there are equal numbers it will be neutral.

Answer: When a material is heated or cooled, two changes may happen to the particles within the material: Chemical bonds between the particles may form, break or stretch. There is a change in the chemical potential store of energy in the material. The material will heat up or cool down as the particles within it gain or lose speed.

Explanation:

The density of the glass can be determined using the formula:

Density is defined as the ratio of mass and volume of a substance.

The mass of the glass = Final mass of beaker  - initial mass  of beaker (Mf - Mi)

The initial mass of the beaker is not given.

Volume of the glass marble = 20 cm³

Density of the glass = (Mf - Mi)/20 cm³

Therefore, the density of the glass is determined from the ratio of the mass and volume of the glass.

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