A playground merry-go-round has radius 2.70 m and moment of inertia 3000 kg/m^2 about a vertical axle through its center, and it turns with negligible friction. PART A : A child applies an 20.0 N force tangentially to the edge of the merry-go-round for 25.0 s . If the merry-go-round is initially at rest, what is its angular speed after this 25.0 s interval? w= PART B : How much work did the child do on the merry-go-round? W= PART C : What is the average power supplied by the child? P=

The balanced formula is B.

Conduction is the transfer of heat energy between two objects or substances that are in contact with each other, due to a temperature difference between them.

Conduction is the transfer of heat or electrical energy through a material or substance, without any visible movement of the substance itself. It occurs in solids, liquids, and gases, but is most efficient in solids, where the molecules are tightly packed and can easily transfer energy from one to the other. In conductive materials, heat or electrical energy is transferred by the flow of electrons, atoms, or molecules from a region of higher energy to a region of lower energy.

The rate of conduction depends on several factors, including the temperature difference between the two regions, the physical properties of the material, and the distance between the two regions. Conduction is an important process in everyday life, and understanding its principles is crucial in many fields, including engineering, physics, and materials science.

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Answer:

6.62 seconds

Explanation:

Answer:

A. losing one electron

Hope this helps :)

Answer:

Explanation:

Answer:

here

Explanation:

Copper is commonly used as an effective conductor in household appliances and in electrical equipment in general. Because of its low cost, most wires are copper-plated. You will often find electromagnet cores normally wrapped with copper wire

By conversion unit, the length in meters of green light wavelength is 5 x 10¯⁷ m.

We need to know about a conversion unit to solve this problem. Meter is the SI unit for length but there are other units which able to determine the length such as nanometer. The conversion unit of nanometer to meter is

1 nm = 10¯⁹ m

From the question above, we know that the wavelength of green is 500 nanometers. in a meter, we can write as

500 nm = 500 x 10¯⁹ m

500 nm = 5 x 10¯⁷ m

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Relation between velocity and time

\(\\ \sf\Rrightarrow Velocity=\dfrac{Displacement}{Time}\)

Or

\(\\ \sf\Rrightarrow \vec{v}=\dfrac{dx}{dt}\)

Now

\(\\ \sf\Rrightarrow v\propto \dfrac{1}{t}\)

Answer:

Furthermore, the Pythagorean theorem works when the two added vectors are at right angles to one another - such as for adding a north vector and an east vector.

The complete question is

A 45-kg child sits on a 3.2-kg tire swing. The tension on the rope is 470 N. The tree branch sags and the child's feet rest on the ground. If the tension in the rope is reduced to 220 N, what is the value of the normal force being exerted on the child's feet?

Answer:

Therefore the Normal force is being exerted on the child's feet is 252.36( 250N).

Explanation:

We are given

mass of child = 45kg

mass of the tire = 3.2kg

g = 9.8 m/s^2

We have the first case in which the tire is in swing so tension in that case will be which is the resultant force.

Fr = Resultant force

Ft =  Tension force

Fg= Gravitational force

Fr = Fg + Ft

0 = -mg + Ft

Ft = mg

   = (45+3.2)*9.8

   = 48.2 * 9.8

Ft = 472.36N  ( which is close to 470)

In the second case the child is in the rest position, The resultant force will be zero.

Fr = Ft + Fn + Fg  ( Normal force is denoted by Fn )

0 = Ft + Fn + Fg

Fn =  -Fg -Ft

Fn = mg -Ft

    = 472.36 - 220

Fn  = 252.36N  ( close to 250N)

Therefore the Normal force being exerted on the child's feet will be 252.36N.  

Answer:

1.Power

2.warming

3.preserve

4.less

5.Paper

6.Fossil

7.ride cycle

8.Non renewable energy sources

Please check it once and reply

Answer:

300 Newtons

Explanation:

Weight is the force of attraction between two bodies, one usually larger (like a planet), and one smaller (like a person). Force can be calculated using the formula: Force = mass × acceleration.

The mass here is 12kg, the acceleration, which in this case, is the acceleration due to gravity is 25m/s/s, by plugging in our values, we have

Force = 12 × 25 = 300 Newtons or 300 N for short.

The correct option is B because It is obvious that gold has a higher monetary worth on the surface of the moon than it does on Earth.

Despite their brilliance, neither Newton nor Leibniz could create or discover calculus. The corpus of mathematics known as calculus evolved through many centuries in many different regions of the world, including greek Culture, the Middle East, India, Chinese, and Japan in addition to western Europe.

The theory of widespread gravity was developed by Isaac Newton (1642–1727), who is best known for credited with creating the calculus in the mid- to late 1660s (more than a decade because once Leibniz did so independently and ultimately more significantly). The latter was done in his Principia, which is considered to be his most significant work.

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Prioritizing hydropower in Nepal can lead to increased energy security and a more sustainable future for the country.

Nepal, hydropower should be given more priority than fossil fuels for two main reasons:
1. Abundant Water Resources: Nepal is endowed with numerous rivers and streams, which makes it an ideal location for hydropower generation. Tapping into these water resources to produce electricity can greatly contribute to the country's energy needs, while reducing its dependence on imported fossil fuels.
2. Environmental Sustainability: Hydropower is a renewable and clean energy source, unlike fossil fuels, which emit harmful greenhouse gases when burned. By prioritizing hydropower, Nepal can reduce its carbon footprint and mitigate the impacts of climate change, while also preserving its natural resources for future generations.
In summary, prioritizing hydropower in Nepal can lead to increased energy security and a more sustainable future for the country.

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Answer:

Prolonged exposure to extreme heat can cause heat exhaustion, heat cramps, heat stroke, and death, as well as exacerbate preexisting chronic conditions, such as various respiratory, cerebral, and cardiovascular diseases.

Absorption and emission spectra are both important tools used by astronomers to study the properties of light emitted by stars and other celestial objects. The absorption spectrum is a graph or chart that shows the wavelengths of light that are absorbed by a substance, while the emission spectrum shows the wavelengths of light that are emitted by a substance.


The absorption spectrum is created by passing a beam of white light through a sample of gas or other substance. The sample will absorb certain wavelengths of light, leaving dark bands or lines on the spectrum. These bands correspond to specific elements or compounds present in the sample, and can be used to identify the chemical composition of stars and other celestial objects.

In contrast, the emission spectrum is created by exciting a sample of gas or other substance with energy, such as an electric current or a high-energy laser. The excited atoms or molecules will emit light at specific wavelengths, producing bright bands or lines on the spectrum. These bands can also be used to identify the chemical composition of stars and other celestial objects.


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Answer:

PE = mgh

Explanation:

m is mass, g is gravitational constant (9.81) and h is height

Scientists are confident that they have succeeded in making a detection when they have observed a signal that is consistent with the predicted characteristics of the phenomenon they are trying to observe.

When this signal is statistically significant, meaning that it is unlikely to have occurred by chance. For example, in the case of gravitational wave detection, scientists use highly sensitive detectors, such as the Laser Interferometer Gravitational-Wave Observatory (LIGO) to measure minuscule distortions in space-time caused by passing gravitational waves.

When the data from the detectors is analyzed, scientists look for signals that match the predicted waveform of a gravitational wave. They also use statistical methods to determine the probability that the observed signal is not just random noise.

If the observed signal matches the predicted waveform and has a low probability of occurring by chance, scientists can be confident that they have made a detection. However, it is important to note that these detections are often very difficult to make and require a high level of precision and accuracy in both the instruments and the analysis techniques used.

Therefore, scientists also subject their findings to rigorous peer review and validation by independent researchers to confirm the validity of their results.

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Answer:

323.4N

Explanation:

Given parameters:

Mass of the box = 33kg

Unknown:

Normal force on the body  = ?

Solution:

The normal force of a body is the vertical force the body exerts on another body.

It is expressed as;

        Normal force  = mass x acceleration due to gravity

Acceleration due to gravity  = 9.8m/s²

Normal force  = 33 x 9.8  = 323.4N

Answer:

450 g =0.9921 lb

Explanation:

Answer:

This one's easy

The final velocity of the truck and the sedan together is +7.19 m/s. This can be calculated using the law of conservation of momentum: m1v1 + m2v2 = (m1+m2)vf, where m1 and m2 are the masses of the truck and the sedan respectively, v1 is the velocity of the truck, v2 is the velocity of the sedan (which is 0 in this case) and vf is the final velocity of the truck and the sedan together.

Answer:

Explanation:

Approximately 47% of the sunlight striking the Earth is actually captured by the biosphere on any given day.

1. When sunlight reaches the Earth, it is absorbed by various components of the biosphere, such as plants, trees, and algae.
2. These organisms use sunlight for photosynthesis, converting it into chemical energy.
3. Studies estimate that around 47% of the total sunlight is captured and utilized by the biosphere for various biological processes.

On any given day, sunlight strikes the Earth, providing energy for various life processes. When sunlight reaches the biosphere, which includes plants, trees, and other photosynthetic organisms, it is absorbed and utilized through the process of photosynthesis. During photosynthesis, sunlight is converted into chemical energy, which is then stored in the form of glucose and used by the organisms for growth, reproduction, and other metabolic activities.

Although the exact percentage may vary depending on factors such as geographical location and time of year, studies estimate that approximately 47% of the sunlight that reaches the Earth is captured and utilized by the biosphere. This means that almost half of the sunlight energy is harnessed by living organisms, highlighting the crucial role of the biosphere in capturing and utilizing solar energy for the sustenance of life on Earth.

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Answer:

Wavelength.

Explanation:

1 period, or wavelength, is measured from one crest to another or from one trough to another.

i. The intensity of solar radiation at Mars' orbit can be estimated using the average radius of orbit and considering the distribution of solar radiation from a disk to a sphere on the surface of Mars.

ii. The average reflected shortwave flux can be estimated by considering the albedo of Mars, which is about 0.25.

iii. To balance the net downward shortwave flux, there must be an average upward longwave flux.

iv. Based on the answer from part iii, the effective temperature of Mars as observed from space can be estimated using the Stefan-Boltzmann Law.

i. The intensity of solar radiation at Mars' orbit can be estimated by considering the distance between Mars and the Sun, which is given as the average radius of the orbit of Mars (2.28×10^11 m). This distance affects the amount of solar radiation received by Mars. The average downward solar flux at the top of the Martian atmosphere can then be calculated by taking into account that solar radiation strikes a disk at Mars' orbit but needs to be distributed over a sphere on the surface of Mars.

ii. The albedo of Mars, which is about 0.25, represents the fraction of solar radiation that is reflected by the planet's surface. By considering this albedo value, we can estimate the average reflected shortwave flux, which is the amount of solar radiation that is reflected back into space by Mars.

iii. In order to balance the net downward shortwave flux, there needs to be an average upward longwave flux. The net downward shortwave flux represents the incoming solar radiation that reaches the surface of Mars, while the upward longwave flux represents the outgoing thermal radiation emitted by the planet. To maintain radiative balance, the upward longwave flux needs to match the net downward shortwave flux.

iv. Based on the answer from part iii, we can estimate the effective temperature of Mars as observed from space using the Stefan-Boltzmann Law. This law relates the temperature of an object to the amount of thermal radiation it emits. By equating the upward longwave flux to the net downward shortwave flux, we can solve for the effective temperature of Mars.

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If the resistance remains constant and the voltage doubles, the power will increase by a factor of 4 (option E)

The following data were obtained from the question:

P = V² / R

Resistance is constant, we have

V₁² / P₁ = V₂² / P₂

V² / P = (2V)² / P₂

V² / P = 4V² / P₂

Cross multiply

V² × P₂ = P × 4V²

Divide both side by V²

P₂ = P × 4V² / V²

P₂ = P × 4

From the above, we can conclude that the power will increase by a factor of 4 (option E)

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Answer:

The change in her position (from beginning to end), along with the direction, is considered her displacement.

Explanation:

Answer:

The change in her position ( from beginning to end), along with the direction, is considered her displacement. This value is a measurement and a direction. The total distance along the path from her starting point to her endpoint is considered her distance. This value is a measurement only.

Answer:

B) Age, gender, and joint structure cannot be changed.

Explanation:

gimme brainliest! :-)

Answer:

Voltmeter

Explanation:

Voltmeter is used to measure both terminal potential difference as well as electromotive force (e.m.f.) depending upon the connection state of the battery or cell.