A light year is _____.


A. the distance light travels in a year

B.the distance travels in a day

C. the amount of time it takes light to get to the nearest star

Answer: Hello!  

"The force which attracts iron nails towards a magnet" is a magnetic force, where the only thing acting on the iron nails is the magnetic field produced by the magnet.

"The force which attracts a positive charge towards a negative charge" and this is an electric force, where the negative charge creates an electric field, and this electric field acts on the positive charge

Both forces are related because both of them are consequences of the electromagnetic field.

Because the things acting on the objects are fields, both of these forces are non-contact forces.

Answer:

This phenomenon is called chromatic aberration. This happens when light of different wavelengths focuses at different points. A converging lens is used to help light of different wavelengths focuses at a common point.

Explanation:

This phenomenon is called chromatic aberration. This happens when light of different wavelengths focuses at different points. A converging lens is used to help light of different wavelengths focus at a common point.

"Chromatic aberration is a phenomenon in which light rays passing through a lens focus at different points, depending on their wavelength. There are two types of chromatic aberration: axial chromatic aberration and lateral chromatic aberration."

"Wavelength is the distance travelled by a particle on the wave when it completes one oscillation. Meters (m) is the SI unit. "Amplitude is the maximum distance covered by the particle from its mean position. The number of oscillations completed in unit time is known as frequency.

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Only a hurricanes speed is not enough information to be able to warn people to evacuate.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is a meter/second. The generally considered unit for speed is a meter per second.

Only knowing a hurricane's speed is insufficient information to issue an evacuation warning because the speed does not reflect the strength of the hurricanes, and the speed of the hurricanes does not tell anything about the directional, movement of the hurricanes as we know the speed is a scalar quantity which does not tell anything about the direction of the moving object.

Thus, only knowing a hurricane's speed is insufficient information to issue an evacuation warning.

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Answer: The correct answer is an emission line spectrum.

Explanation:

When the electrons are excited to the higher energy level, the energy is absorbed in this case.

When the electrons in the atom step down to lower energy levels in a thin cloud of hot gas then the radiation will emit.

The electron will lose energy in this case in the form of radiation. There will be an emission line spectrum.

When the electrons step down to lower energy level, emission line spectrum produced.

Further Explanation:

The spectrum of emission of an element is spectrum of wavelength of radiation emitted during the transition of electron from a higher energy level to lower energy level. The energy of photon emitted in this process is equal to difference between the two levels. There is possibility of different types of transition for an atom and energy difference is specific for each atom.

When electrons are excited in atom, extra energy forces electrons to higher energy orbital. When electron goes to lower state, energy releases in form of photon. This emitted photon form the emission line spectrum.

Emission is process in which higher energy state of the particle convert into a lower state through the emission of photon, which produces light. The frequency of emitted light is function of transitional energy.

Since energy of system conserved, difference in energy between two states equal to energy carried by photon. The energy state of transitions results in emission of large frequency range.

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3. Average translational kinetic energy: https://brainly.com/question/9078768

Answer Details:

Grade: High School

Subject: Physics

Chapter: Modern physics

Keywords:

Electrons, step, lower, energy, levels, thin, cloud, hot, gas, emission, line, spectrum, ground, state, higher, radiation, transition, energy, light and photon.

Answer:

Velocity is a speed with a direction vector associated with it speed is just a displacement per unit of time which makes it scalar

Explanation

E =  h c / ʎ

where,

h is the Planck’s constant = 6.626 x 10⁻³⁴ m² kg / s

c is the speed of light = 3 x 10₈ m/s

ʎ is the wavelength of light = 150 nm = 150 x 10⁻⁹ m

Now pot the values in equation;

E = (6.626 x10⁻³⁴ m² kg / s) x (3 x 10⁸ m/s) / (150 x 10⁻⁹ m)

E = 1.325 x 10⁻¹⁸ J

Now by using the following equation we can calculate the frequency;

E = hf

f = E/h

f = 1.325 x 10⁻¹⁸ / 6.626 x 10⁻³⁴ 

f = 1.9997 x 10¹⁵ Hz

The energy of an ultraviolet photon with a wavelength of 150 nm is 1.33 × 10⁻¹⁸ J, and its frequency is 2 × 10¹⁵ Hz.

To determine the energy of an ultraviolet photon with a wavelength of 150 nm, we need to first find the photon’s frequency using the light equation:

c = λ × ν

Rearranging the equation to solve for frequency:

ν = c / λ

Substituting the values:

ν = (3.00 × 10⁸ m/s) / (150 × 10⁻⁹ m) = 2.00 × 10¹⁵ Hz

Next, we use Planck’s equation to find the energy of the photon:

E = h× ν

Substituting the values:

E = (6.626 × 10⁻³⁴ J·s) × (2.00 × 10¹⁵ Hz) = 1.33 × 10⁻¹⁸J

The energy of the ultraviolet photon with a wavelength of 150 nm is 1.33 × 10⁻¹⁸ Joules, and its frequency is 2 × 10¹⁵ Hz.

Kepler's second law of planetary motion states that the imaginary line connecting the sun to a planet sweeps out equal areas in equal times.

Kepler's second law of planetary motion states that the imaginary line connecting the sun to a planet sweeps out equal areas in equal times. This means that as a planet moves around the sun, it will cover equal areas in equal amounts of time. This law helps explain how planets move in their orbits and provides insight into the dynamics of the solar system.

For example, consider two points in a planet's orbit, point A when it is close to the sun, and point B when it is farther away. The imaginary line drawn from the sun to the planet at point A will sweep out a large arc due to the increased speed, corresponding to a large area. At point B, where the planet is moving slower, the arc and hence the area swept out will be smaller. According to Kepler's Second Law, these two areas will be equal if the time periods considered are equal.

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Answer:

Explanation:

Plastic can be used for various purposes due to the fact that it can be molted into different shapes and sizes. It is a good packaging and transport material. Due to it's sterile nature does not support microbial growth thus used in healthcare items. It is inexpensive and can be affordable by all.

The wavelength of the light is approximately 633 nanometers (nm).

Wavelength is simply the distance over which the shapes of waves are repeated. It is expressed as:

λ = c ÷ f

Where λ is wavelength, c is speed of light and f is frequency.

Given the parameter:

Frequency f = 4.74 × 10¹⁴ Hz

Speed of light c = 3.00 × 10⁸ m/s

Wavelength λ =?

Plug the values into the above formula and solve for the wavelength λ:

λ = c ÷ f

λ = (3.00 × 10⁸) ÷ (4.74 × 10¹⁴)

λ = 6.33 × 10⁻⁷ meters

λ = 6.33 × 10⁻⁷ meters × 1,000,000,000

λ = 633 nm

Therefore, the wavelength measures 633 nm.

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The driver's acceleration is approximately 0.08 m/s^2.

The driver's initial speed was 80 km/h and he reaches 110 km/h after driving a distance of 500 m. To find the driver's acceleration, we can use the formula:

Acceleration = (Final Speed - Initial Speed) / Time

Since the distance is given, we need to find the time taken.

Using the formula:

Distance = Initial Speed * Time + (1/2) * Acceleration * Time^2

We can substitute the given values (Initial Speed = 80 km/h, Final Speed = 110 km/h, Distance = 500 m) and solve for the time. Once we have the time, we can substitute it back into the first equation to find the acceleration.

After calculating, the driver's acceleration is approximately 0.08 m/s^2.

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You have to convert it to newtons so:

4,000 N

I believe this question ask for the energy dissipated by friction.

The overall energy equation for this is:

F = PE – KE

where F is friction loss, PE is potential energy = m g h, KE is kinetic energy = 0.5 m v^2

F = 66 kg * 9.8 m/s^2 * 170 m – 0.5 * 66  kg * (11 m/s)^2

F = 105,963 J  ~  106,000 J 

A total of 1.1 × 10⁵Joules energy was dissipated by friction

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Let's recall Kinetic Energy Formula as follows:

[tex]Ek = \frac{1}{2}mv^2[/tex]

Ek = Kinetic Energy ( Joule )

m = mass of the object ( kg )

v = speed of the object ( m/s )

Let us now tackle the problem !

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Complete Questions:

A 66-kg skier starts from rest at the top of a 1200-m long trail which drops a total of 170 m from top to bottom. at the bottom, the skier is moving 11.0 m/s. How much energy was dissipated by friction?

Given:

mass of skier = m = 66 kg

height of trail = h = 170 m

velocity of skier = v = 11.0 m/s

Asked:

work done by friction = W = ?

Solution:

[tex]W = Ep - Ek[/tex]

[tex]W = mgh - \frac{1}{2}mv^2[/tex]

[tex]W = 66(9.8)(170) - \frac{1}{2}(66)(11.0)^2[/tex]

[tex]W = 109956 - 3993[/tex]

[tex]W = 105963[/tex] [tex]\texttt{ J}[/tex]

[tex]W \approx 1.1 \times 10^5 \texttt{ J}[/tex]

[tex]\texttt{ }[/tex]

A total of 1.1 × 10⁵ Joules energy was dissipated by friction

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[tex]\texttt{ }[/tex]

Grade: High School

Subject: Physics

Chapter: Dynamics

Answer:

1= Cerebrum.

2=Ventricles  

3.Cerebellum.

4.Brain stem  

5.Spinal cord.

Explanation:

A motorcycle mainly wastes energy as heat energy and sound energy. In the engine, chemical energy is transformed into mechanical energy. However, the engine is inefficient and much of the chemical energy is lost as heat energy. Also, some of the energy is transformed to sound energy. This explains why the motorcycle is noisy and has an exhaust pipe.

Answer: it's A this will help you

Explanation:

The mass of the ball is approximately 18.57 grams.

To determine the mass of a ball with a given velocity and wavelength, we can use the de Broglie relation, which states that the wavelength [tex]\( \lambda \)[/tex]of a particle is inversely proportional to its momentum  p . The de Broglie relation is given by:

[tex]\[ \lambda = \frac{h}{p} \][/tex]

where h is Planck's constant[tex]6.626 \times 10^{-34} \)[/tex] Js) and  p  is the momentum of the particle. The momentum can also be expressed as the product of the mass  m of the particle and its velocity  v :

p = mv

Combining these two equations, we get:

[tex]\[ \lambda = \frac{h}{mv} \][/tex]

Rearranging the equation to solve for mass  m , we have:

[tex]\[ m = \frac{h}{\lambda v} \][/tex]

Given:

- Velocity v = 40.0 m/s

- Wavelength[tex]\( \lambda = 8.92 \times 10^{-34} \)[/tex]m

- Planck's constant \[tex]h = 6.626 \times 10^{-34} \)[/tex] Js

Plugging in the values, we get:

[tex]\[ m = \frac{6.626 \times 10^{-34} \text{ Js}}{(8.92 \times 10^{-34} \text{ m})(40.0 \text{ m/s})} \][/tex]

[tex]\[ m = \frac{6.626 \times 10^{-34}}{8.92 \times 10^{-34} \times 40.0} \][/tex]

[tex]\[ m = \frac{6.626}{8.92 \times 40.0} \][/tex]

[tex]\[ m \ =\frac{6.626}{356.8} \][/tex]

[tex]\[ m \ = 0.01857 \text{ kg} \][/tex]

Converting the mass to grams (since 1 kg = 1000 g), we have:

[tex]\[ m \ = 0.01857 \text{ kg} \times 1000 \text{ g/kg} \][/tex]

[tex]\[ m \ =18.57 \text{ g} \][/tex]

An environmental agent can be a biological, chemical, or physical factor causing harm to health and ecosystems, with examples including heavy metals and pesticides like DDT. These agents can cause immediate to long-term damage and may lead to resistance in the target organism. Bioremediation is a strategy used to combat environmental contamination.

An environmental agent is a biological, chemical, or physical factor that has the potential to cause harm to humans, ecosystems, or both. Chemical agents, such as heavy metals like mercury, lead, and cadmium, pesticides and endocrine disrupters, contribute significantly to environmental damage and can pose serious health risks. These agents are often by-products of industrial activities and can biomagnify in the food chain, leading to toxic levels in organisms at higher trophic levels, such as swordfish, which can then affect humans who consume them.

Environmental contamination can stem from diverse sources, impacting air, water, and soil. Contaminants can lead to acute or chronic health problems, affecting specific organs, cells, or biochemical pathways in the body. The field of environmental toxicology strives to understand and mitigate these effects, knowing that substances such as DDT and other pesticides have both immediate and long-term ecological consequences, while also becoming less effective over time as pests develop resistance.

Examples of Environmental Agents and Their Impact:

It is vital to address these environmental threats by employing strategies such as bioremediation, using plants to clean up soils from toxic metals, for example, to safeguard human health and protect ecosystems.