Star A and star B have different apparent brightnesses but identical luminosities. If star A is 30 light-years away from Earth and star B is 60 light-years away from Earth, which star appears brighter

The current i is 0.714 A (ampere), rounded to three significant figures.

Assuming that the circuit is in steady-state and applying symmetry, we can see that the current through the central branch (connecting R1 and R2) is zero. Therefore, the current i flows only through the outer branches, as shown in the diagram:

Using Ohm's law, the voltage drop across each resistor is:

V = iR

For the outer branches, the voltage drop across R is the same as the total voltage E:

E = iR + i(r1 + r2)

Substituting the given values, we get:

7V = i(2.6Ω) + i(3.6Ω + 3.6Ω)

Simplifying and solving for i, we get:

i = 7V / (2.6Ω + 7.2Ω) = 7V / 9.8Ω = 0.714 A

Therefore, the current i is 0.714 A (ampere), rounded to three significant figures.

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Answer:

mass 3.67 kg, density 600 kg/m3) is fitted

with lead (density 1.14 * 10^4 kg/m3) so that it floats in water with

0.900 of its volume submerged. Find the lead mass if the lead is fitted

to the block’s (a) top and (b) bottom.

The starling needs to consume 0.33 mg of carbohydrates to fuel its 1.4 km flight at 11 m/s.

The amount of carbohydrates a starling needs to consume to fuel its 1.4 km flight at 11 m/s can be calculated using the concept of metabolic rates and energy requirements.Metabolic rate is the amount of energy required by an organism to maintain vital functions and carry out physical activities. Energy requirement is dependent on the organism's size, weight, and activity level.Studies have shown that small birds like the starling have high metabolic rates, which means they require a lot of energy to carry out their activities. In flight, birds primarily use carbohydrates as their energy source. Carbohydrates are stored in the muscles and liver as glycogen and are broken down into glucose during flight to provide energy. The amount of glycogen required is proportional to the amount of energy needed to fuel the flight.Using the equation for kinetic energy, KE =\frac{ 1}{2}mv^{2}, where KE is kinetic energy, m is mass, and v is velocity, we can calculate the energy required to fuel the bird's flight. The mass of a starling is approximately 85 grams. Substituting the values,KE =\frac{ 1}{2} * 0.085 kg * (11 m/s)^{2}; KE = 5.69 J. The energy required to fuel the flight is 5.69 joules. Since 1 gram of carbohydrates provides 17 kJ of energy, the amount of carbohydrates required can be calculated as follows:Carbohydrates required =\frac{ Energy required }{ Energy per gram of carbohydrates}  

Carbohydrates required = \frac{5.69 J }{17,000 J/g }

Carbohydrates required = 0.00033 g or 0.33 mg

Therefore, the starling needs to consume 0.33 mg of carbohydrates to fuel its 1.4 km flight at 11 m/s.

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It takes 2 seconds for the charge to pass a point in the wire. The result is obtained by using the formula for an electric current equation.

Electric current is a flow of charged particles per unit of time. It can be expressed as

I = Q/t

Where

A light bulb has

Find the time taken!

We use the formula above to find t.

I = Q/t

0.835 = 1.67/t

t = 1.67/0.835

t = 2 s

Hence, the time needed to for the charge to pass a point in the wire is 2 seconds.

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The air resistance on the feather is 20.2275 x \(10^9\)N.

Air resistance is the force the air applies to objects moving through it. Scientists frequently refer to this force as drag or drag force. Usually, this force is utilized to slow down the object's speed by acting in the opposite direction.

The moving body is subject to the frictional force of air resistance. Air resistance slows a moving body down. The body experiences higher air resistance the more it moves.

Given:

Mass, m = 10g

Height, h = 3m

Time, t = 2s

Force constant, k = 8.99 x \(10^9 Nm^2\)

To find:

Air resistance, Fa = ?

Formula:

\(Fa = kv^2\)

Calculations:

Speed, v = h/t

v = 3/2

v = 1.5m/s

Fa = 8.99 x \(10^9\) x 1.52

Fa = 20.2275 x \(10^9\)N

Result:

The air resistance on the feather is found to be 20.2275 x \(10^9\)N.

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The electric field strength at a distance of 1.20 m on the x-axis is -1.5 × 10⁴ N/C.

To find the electric field strength at a distance 1.20 m on the x-axis, we can use Coulomb's law:

\($$F=k\frac{q_1q_2}{r^2}$$\)

where F is the force between two charges, q1 and q2 are the magnitudes of the charges, r is the distance between the charges, and k is the Coulomb constant.For a single point charge q located at the origin of the x-axis, the electric field E at a distance r is given by:

\($$E=\frac{kq}{r^2}$$\)  where k is the Coulomb constant.

So, let's calculate the electric field due to each charge separately and then add them up:

For the +2.0 C charge at x = 0, the electric field at a distance of 1.20 m is:\($$E_1=\frac{kq_1}{r^2}=\frac{(9\times10^9)(2.0)}{(1.2)^2}N/C$$\)

For the -3.0 C charge at x = 0.40 m, the electric field at a distance of 1.20 m is:

\($$E_2=\frac{kq_2}{r^2}\)

\(=\frac{(9\times10^9)(-3.0)}{(1.20-0.40)^2}N/C$$\)

The negative sign indicates that the direction of the electric field is opposite to that of the positive charge at x = 0.

To find the net electric field, we add the two electric fields\(:$$E_{net}=E_1+E_2$$\)

Substituting the values of E1 and E2:

\($$E_{net}=\frac{(9\times10^9)(2.0)}{(1.2)^2}-\frac{(9\times10^9)(3.0)}{(0.8)^2}N/C$$E\)

net comes out to be -1.5×10⁴ N/C.

Therefore, the electric field strength at a distance of 1.20 m on the x-axis is -1.5 × 10⁴ N/C.

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Nuclei of H1 and nuclei of H2 are the only stable nuclei oh hydrogen.

Hydrogen is the first and most basic of all elements in the universe.

Radiation is spontaneously emitted from nuclei of H3 because this isotope of hydrogen is highly radioactive as compared to other isotopes of hydrogen namely; nuclei of H1 and nuclei of H2.

The nucleus of H3 also called as tritium contains one proton and two neutrons, while the nucleus of the common isotope H-1 (protium) contains one proton and zero neutrons, and the nucleus of H-2 (deuterium) contains one proton and one neutron.

Therefore H1 and H2 have much stable nucleus as compared to nuclei of H3.

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Answer:

I think its dense and solid and located near a star.

Explanation:

Hope this helps, good luck.

The labels for vectors A, B, and C ought to be determined by their magnitudes and directions. It is essential to keep track of their angles in relation to the +x axis.

We need to use trigonometry to figure out the y and x-components of each vector in order to find Ay, Ay, B., B, C, and C. The magnitude of the vector is divided by the cosine of its angle with the +x-axis to get the y-component, and the magnitude of the vector is divided by the sine of its angle with the +x-axis to get the x-component.

The Pythagorean theorem can be used to determine the net force. We really want to add the x and y-parts of the vectors to acquire the resultant vector. The Pythagorean theorem can then be used to determine the magnitude of the net force.

In conclusion, we can use the Pythagorean theorem to determine the net force and trigonometry to determine the components of each vector.

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The equation =c/f relates wavelength and frequency. There is an inverse relationship between wavelength and frequency.

One crucial equation connects them all: The speed of light is equal to the frequency times the wavelength of any electromagnetic wave. If we know the other measurement, we can use this connection to calculate the wavelength and frequency of the any electromagnetic wave.

The distance between the crests of two waves is known as the wavelength, which also applies to troughs. The number of vibrations that pass across a certain area in a second is the frequency, which is expressed in seconds per cycle (Hz) (Hertz). This article discusses how wavelength and frequency relate to one another.

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Answer:

C. a disturbance that travels through a medium with a transfer of energy and without a transfer of matter

Explanation:

A wave is any disturbance that transfers energy from one location to the other via a substance called medium. It is important to note that a wave only conveys energy and not matter. For example, sound wave is a type of wave that carries sound energy from one place to another via mediums such as water, air etc.

Hence, according to this question, a wave can be described as a disturbance that travels through a medium with a transfer of energy and WITHOUT A TRANSFER OF MATTER.

Answer:

These layers are the troposphere, the stratosphere, the mesosphere and the thermosphere.

A further region, beginning about 500 km above the Earth's surface, is called the exosphere.

Explanation:

Hope this helps you. Have a nice day. Please mark as brainliest. It helps a lot.^_^

Answer: All isotopes of a given element have the same number of protons but different numbers of neutrons in each atom. ... Each atomic number identifies a specific element, but not the isotope; an atom of a given element may have a wide range in its number of neutrons.

Explanation: Hopefully this helps. Have a great day.

The energy of the scattered photon increases as the scattering angle in the Compton effect increases. The correct option is A.

The Compton effect refers to the scattering of photons by charged particles, typically electrons. When a photon interacts with an electron, it can transfer some of its energy and momentum to the electron. As a result, the photon changes its direction and its energy.

In the Compton effect, the change in the energy of the scattered photon depends on the scattering angle, which is the angle between the initial and final directions of the photon. According to the Compton formula, the change in energy (ΔE) of the scattered photon is given by:

ΔE = E' - E = \(\frac{{h}}{{m_e c}}(1 - \cos \theta)\),

where E' is the energy of the scattered photon, E is the initial energy of the photon, h is the Planck's constant, me is the mass of the electron, c is the speed of light, and θ is the scattering angle.

From the Compton formula, it can be observed that as the scattering angle increases (θ increases), the term (1 - cosθ) becomes larger, resulting in a larger change in energy (ΔE). Therefore, the energy of the scattered photon increases as the scattering angle increases in the Compton effect. Option A is the correct answer.

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Answer:

The answer to your problem is, B. X and Z

Explanation:

Heat always transfers from hotter object to colder object. Because well heat it like a big territory with a leader that just wants to get hotter and hotter.

Our conduction will occur when there is contact between hotter body and colder body. The molecules vibrate at their position and transfer heat to the neighboring molecules which can be hot or cold. In the diagram conduction takes place at X and Z. The heat transfers from pan to handle at X and then from handle to hand at Z.

We also know that bulk or stable motion of fluid carries energy. Like in area W in the diagram. Radiation does not require medium to transfer energy because it is not needed for it. Like in the area of Y.

Thus the answer to your problem is, B. X and Z

The magnetic fields are approximately 1.0 T at positions 5.00 cm to the left and right of wire 1, and 0.33 T at a position 15.00 cm to the right of wire 1, regardless of the direction of the currents.

To neutralize the vertical component of the Earth's magnetic field, we can use Ampere's law for a flat circular coil:

B = μ₀ * N * I / (2 * R)

where:

B is the magnetic field to be neutralized,

μ₀ is the permeability of free space (4π x \(10^{-7}\)T m/A),

N is the number of turns in the coil,

I is the current flowing through the coil, and

R is the radius of the coil.

Given:

B = 52.5 x \(10^{-6}\) T,

N = 25,

R = 15.0 cm = 0.15 m,

We can rearrange the formula to solve for I:

I = (2 * R * B) / (μ₀ * N)

Substituting the values:

I = (2 * 0.15 * 52.5 x \(10^{-6}\)) / (4π x \(10^{-7}\)* 25)

I ≈ 0.33 A

The coil should draw 0.33 A. Right-hand rule can determine current direction. If you grab the coil with your right hand and point your thumb in the desired magnetic field (vertical component), your fingers will wrap around the coil in the current direction. From above the coil, current should flow anticlockwise.

For the second part of the question, the magnetic field due to a long straight wire carrying current I at a distance r from the wire is given by:

B = (μ₀ * I) / (2π * r)

Given:

I = 10.0 A,

r1 = 5.00 cm = 0.05 m (to the left of wire 1),

r2 = 5.00 cm = 0.05 m (to the right of wire 1),

r3 = 15.00 cm = 0.15 m (to the right of wire 1).

For the currents in the same direction:

B1 = (μ₀ * 10.0) / (2π * 0.05) ≈ 1.0 T

B2 = (μ₀ * 10.0) / (2π * 0.05) ≈ 1.0 T

B3 = (μ₀ * 10.0) / (2π * 0.15) ≈ 0.33 T

For the currents in opposite directions:

B1 = (μ₀ * 10.0) / (2π * 0.05) ≈ 1.0 T

B2 = (μ₀ * 10.0) / (2π * 0.05) ≈ 1.0 T

B3 = (μ₀ * 10.0) / (2π * 0.15) ≈ 0.33 T

Therefore, the magnetic fields are approximately 1.0 T at positions 5.00 cm to the left and right of wire 1, and 0.33 T at a position 15.00 cm to the right of wire 1, regardless of the direction of the currents.

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To calculate the power of the crane, we need to use the formula:

Power = Force × Velocity

First, let's find the force acting on the crane using Newton's second law of motion:

Force = Mass × Acceleration

Given:

Mass of the crane (m) = 800 kg

Acceleration (a) = 1 m/s²

Force = 800 kg × 1 m/s² = 800 N

Next, we need to calculate the power at a velocity of 1.5 m/s. Power is the rate at which work is done, and work is equal to the change in kinetic energy. So, we'll use the formula:

Power = Work / Time

Since the crane starts from rest (initial velocity = 0) and reaches a final velocity of 1.5 m/s, we can calculate the work done on the crane:

Work = Change in kinetic energy

= (1/2) × Mass × (Final Velocity² - Initial Velocity²)

Given:

Initial Velocity (v1) = 0 m/s

Final Velocity (v2) = 1.5 m/s

Work = (1/2) × 800 kg × (1.5 m/s)² = 900 J

Now, let's calculate the power:

Power = Work / Time

Since we don't have the time, let's assume it took 1 second to reach the final velocity.

Power = 900 J / 1 s = 900 W

Therefore, the power of the crane when it reaches a speed of 1.5 m/s is 900 watts (W).

In order to help Scarlett retrieve her toy train from the lake, the wooden fishing rod can be modified or adapted by Attaching a magnet, Adding a hook or grappling device, and Using a net or scoop.

Attaching a magnet: Scarlett can attach a strong magnet to the end of the fishing rod. Since the train contains parts made of steel, the magnet will be attracted to the metallic components. By carefully maneuvering the magnet with the fishing rod, Scarlett can potentially attract and retrieve the train from the water.

Adding a hook or grappling device: Scarlett can affix a hook or grappling mechanism to the fishing rod. By casting the hook near the location where the train fell into the lake and skillfully maneuvering the rod, she can attempt to hook onto the train or one of its parts. With a successful hook, she can slowly reel in the train and bring it back to shore.

Using a net or scoop: If the toy train is floating on the surface of the lake or near the shallow edges, Scarlett can attach a net or scoop to the end of the fishing rod. By carefully positioning the net or scoop around the train, she can scoop it up and safely retrieve it without causing any damage.

It's important to note that the success of these modifications will depend on factors such as the depth of the lake, the accessibility of the train, and the size and weight of the fishing rod. Additionally, adult supervision or assistance may be necessary to ensure safety, especially if the lake is deep or poses any hazards.

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Answer:

0.0778 hm

Explanation:

Dm is one below the base (m) so divide by 10 to get to m. Then divide by 10 for each step up the ladder. You go up 2 steps to hm, so divide the m number by 100. That's your final answer.

A mass attached to a spring vibrates back and forth. at maximum displacement.

At the maximum displacement of a mass attached to a spring, the velocity is zero, but the acceleration is not zero.

The maximum displacement is the amplitude of the motion, at which point the restoring force of the spring is at its maximum, and the potential energy is also at its maximum.

The kinetic energy of the system is zero at the maximum displacement. As the mass attached to the spring moves towards its equilibrium position, its kinetic energy increases and its potential energy decreases, until it reaches the equilibrium position where the kinetic energy is at its maximum, and the potential energy is zero. The acceleration is zero at the equilibrium position. As the mass continues to move past the equilibrium position, the potential energy increases, and the kinetic energy decreases until it reaches the maximum displacement again, and the cycle repeats.

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Answer:

Body Mass Index

Explanation:

The most common injury related to electrical hazards are Electrical burns.

What are electrical hazards?

An electrical burn is a type of skin burn that develops when your body comes into contact with electricity. It is possible for electricity to pass through your body when it comes into contact with it. When this occurs, the voltage has the potential to harm tissues and organs.

Hence, The most common injury related to electrical hazards are Electrical burns.

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Answer:

electrons

Explanation:

You might mean an "oxidation-reduction" reaction, also known as a redox reaction, in which electrons are transferred between chemicals (i.e. the oxidation number changes).

An "oxygen-reduction" reaction is a very specific reaction where oxygen gas is reduced to water or hydrogen peroxide.

Answer:Redox reactions are all around us. In fact, much of our technology, from fire to laptop batteries, is largely based on redox reactions. Redox (reduction-oxidation) reactions are those in which the oxidation states of the reactants change. This occurs because in such reactions, electrons are always transferred between species. Redox reactions take place through either a simple process, such as the burning of carbon in oxygen to yield carbon dioxide (CO2), or a more complex process such as the oxidation of glucose (C6H12O6) in the human body through a series of electron transfer processes.

Explanation:

Answer:

Power

Explanation:

Power is defined as the rate of doing work with reference to the time spent and the formula is force multiplied by velocity.

In this case, if two people lift identical stacks of books the same distance and one person does the job twice as fast, then it means the velocity in the case is doubled which will also lead to an increase in the Power .

The formula for power is Work divided by time taken, so P=W/T.

That case, involved power, since one of the people did work twice as fast, but, it was the same amount of work each person did, for the same distance (not exact distance, but usually the same)

Answer:

kinetic energy

Explanation:

Electrical energy is a type of kinetic energy caused by moving electric charges. The amount of energy depends on the speed of the charges – the faster they move, the more electrical energy they carry.

Answer:

gamma rays, ultraviolet, infrared, radio

Explanation:

Because on the Electromagnetic spectrum wavelength increases from the gamma end to radio end and frequency decrease in that order

Answer:

radio → infrared → ultraviolet → gamma

Explanation: yeaaahhh its c