I
2. Conduct a search of scientific and/or technical literature related to the two examples you
found. Identify each source you chose and determine the credibility and reliability of each
source before deciding whether its claim is valid or false. For each source, consider the
following questions. Then choose one of your sources as a sample, and provide your teacher
with answers to the questions for that sample source. (5 points)
A) What is the purpose of the source? Is the article current? (The main purpose of the source
could be documenting scientific research, reporting news, providing entertainment, or marketing
products. A current article is one that was published in the recent past.)
Help

Answer:

  a. 125 kJ

Explanation:

Her total energy is the same as the potential energy she had at the top of the hill:

  PE = mgh

  = (52 kg)(9.8 m/s^2)(245 m) = 124,852 J

  ≈ 125 kJ . . . . matches choice A

_____

After skiing down 112 m, some of her initial energy is converted to kinetic energy, and some remains as potential energy. We assume the ski slope is essentially frictionless, and air resistance is negligible.

If the normal force of the bow on the string is 0. 75 N ,The string be pulled before it slips if the string static friction is bowed at its center is 0.60mm.

The normal force exerted by the bow on the string is the force perpendicular to the surface of contact between them. In this case, the normal force is given as 0.75 N. The string can be pulled before it slips when the applied force reaches the maximum static friction force between the string and the bow.

The maximum static friction force is determined by the coefficient of static friction (μs) between the string and the bow, multiplied by the normal force. The coefficient of static friction represents the interaction between the two surfaces and their tendency to resist relative motion. The maximum normal force force can be calculated using the equation Fmax = μs * N, where Fmax is the maximum static friction force, μs is the coefficient of static friction, and N is the normal force.

Fmax=0.8×0.75

Fmax=0.60mm

The distance to which the string can be pulled before it slips depends on the relationship between the applied force and the maximum static friction force. Once the applied force exceeds the maximum static friction force, the string will start to slip. The specific distance at which this occurs would require additional information about the coefficient of static friction and the applied force.

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Answer:

The locus of points where the electric field due to these lines is zero is;

Along the line between the lines closer to line#1 than line #2

Explanation:

The charges on the parallel lines #1 and #2 = Positive linear charge

The charge density on line #2, λ₂ = 2 × The charge density on line #1, λ₁

Therefore, we have;

λ₂ = 2 ×  λ₁

Electric field strength, E, is given as follows;

\(E = \dfrac{\lambda}{2\cdot \pi\cdot \epsilon_0\cdot d}\)

Therefore;

\(E_1 = \dfrac{\lambda_1}{2\cdot \pi\cdot \epsilon_0\cdot d}\)

\(E_2 = \dfrac{\lambda_2}{2\cdot \pi\cdot \epsilon_0\cdot d} = 2 \times\dfrac{\lambda_1}{2\cdot \pi\cdot \epsilon_0\cdot d}\)

E₂ = 2·E₁

E₂/2 = E₁

E₂/(2·d) = E₁/d

The strength of the electric field at a given distance from line #2 is 2 times the strength of the electric field from line #1 at the same distance

Therefore the strength of the electric field will be the same at a point twice the distance from line #2 than from line #1 which is a point closer to line #1 than line #2.

Responder:

T = 0.25 segundos

f = 4 Hz

Explicación:

Paso uno:

datos dados

se nos dice que las partículas tardan 0,25 segundos en completar una vibración

por lo tanto, el período es de 0,25 segundos

¿Qué es un período de vibración?

Un período T es el tiempo necesario para que un ciclo completo de vibración pase por un punto determinado.

la expresión para el período se da a continuación.

T = 1 / f

¿Cuál es la frecuencia de vibración?

Básicamente, se refiere a la frecuencia con la que ocurren las vibraciones.

la frecuencia es una tasa, se expresa como la inversa del período

f = 1 / T

t = 1 / 0.25

f = 4 Hz

Explanation:

To understand how a differential switch works, you first need to know how an electrical circuit works. If we have a circuit where a current intensity enters, it travels through different loads that may be the electrical elements of the home, the intensity of the electric current coming out of the circuit is the same as the one I enter.

Intensity is lost if, for example, a person is electrocuted, as part of the circuit current is lost by ground. The differential switch compares through the magnetic fields produced, the current coming in and the current coming out of the circuit. Being magnetic fields produced by the same intensity but by currents with opposite direction, these are canceled. In the event that the intensities are different there is a result of magnetic field, which causes a knob that cuts the electrical circuit to move.

The monthly energy cost to run the refrigerator is approximately $7.02.

To determine the monthly energy cost to run a refrigerator, we need to know the power consumption of the refrigerator and the number of hours it operates per month.

The power consumption of the refrigerator is usually stated in watts (W). If you know the power consumption in watts, you can convert it to kilowatts (kW) by dividing by 1000.

Let's assume the power consumption of the refrigerator is 100 watts (0.1 kW), and it operates for an average of 24 hours per day. In a month, there are typically 30 days.

To calculate the energy consumption in kilowatt-hours (kWh) per month, multiply the power consumption in kilowatts by the number of hours of operation per month:

Energy consumption = Power consumption (kW) x Operating hours per month

Energy consumption = 0.1 kW x 24 hours/day x 30 days

Energy consumption = 72 kWh

Now, we can calculate the cost of energy for running the refrigerator. Since electricity rates range from 8 cents/kWh (winter) to 11.5 cents/kWh (summer), we'll use an average rate of 9.75 cents/kWh for this calculation.

Monthly cost = Energy consumption (kWh) x Electricity rate (cents/kWh)

Monthly cost = 72 kWh x 9.75 cents/kWh

Monthly cost ≈ $7.02

Therefore, the monthly energy cost to run the refrigerator is approximately $7.02.

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The day's highest air temperature and lowest relative humidity occur at the same time of day, usually in the afternoon. During this period, the sun's angle is at its peak, resulting in the greatest amount of energy absorption by the atmosphere.

This energy is absorbed by water vapor molecules, which in turn causes an increase in humidity. When relative humidity reaches its lowest point, it is because the air is holding the greatest amount of water vapor possible. This is known as the dew point, and it varies depending on the air temperature and pressure. When the dew point is reached, it means that the air has reached its maximum capacity for water vapor, and any further absorption of moisture would result in precipitation. Relative humidity is a measure of how much moisture is in the air relative to how much the air can hold at that temperature. It is usually expressed as a percentage. The higher the relative humidity, the more moisture the air contains. Conversely, the lower the relative humidity, the less moisture the air contains. This is important because the amount of moisture in the air affects how comfortable we feel. High relative humidity can make us feel hot and sticky, while low relative humidity can make us feel dry and itchy. Therefore, it is important to understand when the day's highest air temperature and lowest relative humidity occur.Usually, the highest air temperature and lowest relative humidity occur in the afternoon, when the sun's angle is at its peak, and the most energy is being absorbed by the atmosphere. This energy is absorbed by water vapor molecules, causing an increase in humidity. When the relative humidity reaches its lowest point, it means that the air is holding the maximum amount of water vapor it can. This is known as the dew point, and it varies depending on the air temperature and pressure. Once the dew point is reached, any further absorption of moisture would result in precipitation.

In conclusion, the day's highest air temperature and lowest relative humidity usually occur in the afternoon when the sun's angle is at its peak. At this time, the energy being absorbed by the atmosphere is causing an increase in humidity, and the relative humidity reaches its lowest point. This means that the air is holding the maximum amount of water vapor possible, known as the dew point. Any further absorption of moisture would result in precipitation.

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Answer: 37 Celsius and 310.15 K

Explanation:

C/5 = (F-32)/9 = (98.6-32)/9 = 66.6/9 = 7.4

C = 7.4 * 5 = 37 so the temperature is 37 Celsius

K = C + 273.15 = 37 + 273.15 = 310.15 K

Answer: Yes the objects would be balanced.

Explanation:

If there is no net force then the object will not move in any direction, meaning that the object is balanced.

Answer:

Mental time travel has been studied by psychologists, cognitive neuroscientists, philosophers and in a variety of other academic disciplines. Major areas of interest include the nature of the relationship between memory and foresight, the evolution of the ability (including whether it is uniquely human or shared with other animals), its development in young children, its underlying brain mechanisms, as well as its potential links to consciousness, the self, and free will.

Explanation:

The following are the accurate observations and inferences:

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it could be D

Explanation:

I am not expert here I have the brain of a peanut but it could be D which is the collision of tectonic plates, because earthquakes tend to happen when the tectonic plates like shift and interact with each other and when its near like the Volcanoes it can cause a off balance and disruption to those inactive Volcanoes and cause them to well burst up magma.

I hope this helps

Answer:

I would most definitely say D.

Explanation:

The collision of tectonic plates causes earth quakes no? So when it happens the molten rock below the ground goes up and finds the most suitable exit, a volcano.

Answer:

3,00,000

Explanation:

because 1 m =100m so, 3000x100=300000

Given:

The mass on the table is,

The hanging mass is,

THe coefficient of friction is,

let the acceleration of the whole system is a (for the hanging mass it is downward and for the mass on the table it is rightward). the tension towards The fixed point of the pulley is T.

we can write,

Adding these equations we get,

Substituting the values we get,

Hence the acceleration is 6.66 m/s^2.

Answer:

A circuit diagram is a graphical representation of an electrical circuit. A circuit diagram, also called an electrical diagram, elementary diagram, or electronic schematic, is a simplified graphical representation of an electrical circuit.

example on the picture

Answer:

driver distraction

Explanation:

Studies and historical data show that the major cause of this is due to driver distraction. When driving many times a driver may look somewhere other than the road and get distracted which accidentally causes the driver to steer outside of the right shoulder of the pavement. This can also be due to the driver becoming tired/sleepy after driving for countless hours or even making a quick maneuver due to oncoming traffic getting too close. Regardless, all of these fall under driver distraction.

The

intensity of light

emitted by an object is proportional to the fourth power of its temperature.

Therefore, the hotter light source is much brighter than the cooler light source by a significant factor. To determine how much brighter, we must first calculate the ratio of their

intensities

.The Stefan-Boltzmann law states that the amount of energy emitted by a black body is proportional to the fourth power of its absolute

temperature

. Hence, we have,$I∝T^4$$\frac{I_1}{I_2}=\frac{(T_1/T_2)^4}{1}$ where I1 and I2 are the intensities of light from the two sources, T1 and T2 are their temperatures, respectively. Substituting the values in the equation, we have:$\frac{I_1}{I_2}=\frac{(4900.0/1900.0)^4}{1}$Calculating the ratio,$$\frac{I_1}{I_2} \approx 46.49$$Therefore, the hotter light source is approximately 46.49 times brighter than the cooler light source.

Thus, we can conclude that the hotter light source is much brighter than the cooler light source by a factor of about 46.5.

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The hotter light source is approximately 56.9 times brighter than the cooler light source. So, the hotter light source is about 56.9 times brighter than the cooler light source.

The brightness of a light source is determined by its temperature, which is measured in Kelvin (K). To compare the brightness of two light sources, we can use the Stefan-Boltzmann law, which states that the total power radiated by a blackbody is proportional to the fourth power of its temperature.
In this case, we have two light sources of different temperatures: 1900.0 K and 4900.0 K. To find out how many times brighter the hotter light source is, we can calculate the ratio of their powers.
The ratio of the powers is given by the equation:
\((4900.0/1900.0)^4\)


It is important to note that this calculation assumes that both light sources have the same size and are at the same distance. Additionally, the Stefan-Boltzmann law applies to idealized blackbodies, which may not perfectly represent all real light sources. However, it provides a useful approximation for comparing the brightness of light sources.

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Answer:

Jump from tallest building (Burj Khalifa) without any protection kit.

Answer:

Acceleration & 9.8 M/S/S

Explanation:

Pretty self explanatory for question 2, speeding up can easily be related to acceleration, and for question 3

"Its value is 9.8 m/s2 on Earth. That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2. When discussing the acceleration of gravity, it was mentioned that the value of g is dependent upon location. There are slight variations in the value of g about earth's surface."

Hope it helped - rida

Answer:

36400N

Explanation:

f =9100×4

f=36400N

Explanation

23.6/100= 0.236

Answer:

Heat is released.

Explanation:

Freezing is almost always an exothermic process, meaning that as liquid changes into solid, heat and pressure are released. This is often seen as counter-intuitive, since the temperature of the material does not rise during freezing, except if the liquid were supercooled.

Answers:

The values are approximate.

==========================================================

Explanation:

When near the surface of the earth, the acceleration of gravity is roughly 9.81 m/s^2. This means that after each second passes, the velocity increases by roughly 9.81 m/s.

After 2.5 seconds, the velocity increases by 2.5*9.81 = 24.525 m/s = 24.5 m/s

If it was already going 25.0 m/s, then it bumps up to 25.0+24.5 = 49.5 m/s which is also approximate.

The acceleration of gravity stays the same when the object is close to the surface of the earth, so it stays at roughly 9.81 m/s^2

Side note: I'm ignoring air resistance (aka air friction or drag) since that greatly complicates things, and we would need to know the shape and surface area of the object. The material type would also be relevant info as well.

Answer:

A. it is Electromagnet

B. there are 2 ways to increase the magnetic field in this situation.

hence only by doing first way ( increase number of turns) magnetic field can be increased.

Answer:(d) mass

Explanation: The kilogram is the standard mass unit that is used almost globally and is the SI unit of mass. The kilogram weighs 9.8 Newtons under normal conditions on the surface of the Earth, and Newton is the corresponding SI unit of force and weight.

Answer:

Continuous reinforcement delivers the reinforcement every single time the target behavior is delivered. (For example, if the target behavior for the dog is sitting when the owner says "sit", the treat (reinforcement) would be given whenever the dog follows the command). It follows a schedule-like reinforcement.

Intermittent reinforcement delivers the reinforcement to responses but are not consistent.