All the fossils that have been found over time are called the

Answer:

Chlorine 35:

Atomic mass 35.43

Number of protons 17

Number of electrons: 17

Number of neutrons: 18

Explanation:

A hair dryer has a power rating of 1,265 W at 220 V rms. The resistance of the heating element is 0.0261 ohm, the rms value of current is 4.078 A and maximum instantaneous power will be 632.5 W.

Given,

Power of the hair dryer, P = 1265 W

and Voltage, V = 220 V

The current in the hair dryer, I = P/V (from P=V×I)

I = 1265/220

= 5.75 Amp

The resistance (R) of the heating element can be calculated as;

P= \(V^{2}\)/R

1265= \(220^{2}\)/R

R=1265/\(220^{2}\)

=0.0261 Ohm

(b) The rms value of current, \(I_{rms}\) = I/\(\sqrt{2}\)

= 5.75/\(\sqrt{2}\)

=4.078 A

(c) Maximum instantaneous power that the resistance withstand can be calculated as;

P(t) = (VI)/2

=(220×5.75)/2

=632.5 W

Hence, the resistance of the heating element is 0.0261 ohm, the rms value of current is 4.078 A and maximum instantaneous power will be 632.5 W.

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According to the most recent data from satellites making precise measurements of the properties of the cosmic background radiation (CBR), it has been determined that dark energy makes up approximately 68% of the total energy density of the universe.

This means that dark energy is the dominant force driving the acceleration of the expansion of the universe.

The CBR is the afterglow of the Big Bang, and by analyzing its properties, scientists can learn more about the structure and evolution of the universe. The Planck satellite, launched in 2009, has been instrumental in providing high-precision measurements of the CBR and contributing to our understanding of dark energy.

Despite being the dominant force in the universe, dark energy remains a mystery. Its nature and properties are still largely unknown, but it is thought to be a property of space itself rather than a type of matter or energy. Ongoing research and observations will continue to shed light on this elusive phenomenon and deepen our understanding of the universe as a whole.

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Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

From the question we have

force = 75 × 3

We have the final answer as

Hope this helps you

Frequency and nzl (number of zero crossings per unit length) are inversely proportional to each other according to the formula nzl = vf, where v is the velocity of the wave and f is the frequency.

The formula for nzl (refractive index minus one) is,

nzl = (c/vl) - 1

where c is the speed of light in a vacuum, and vl is the speed of light in the medium.

Frequency is not directly related to nzl in this formula. However, the refractive index (n) of a medium can depend on frequency. This is known as dispersion, and it means that different frequencies of light may experience different refractive indices and therefore different nzl values in a given medium. In other words, the nzl value can vary depending on the frequency of the light passing through the medium.

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1. The water would be flowing at a speed of 4 m/s through the constricted area.

2. The water would be flowing at a speed of 8 m/s through the constricted area.

3. The water would be flowing at a speed of 1 m/s through the expanded area.

Thus, we can set the product of the initial area and velocity equal to the product of the final area and velocity:

10 cm² x 2 m/s = 5 cm² x v

Solving for v, we get:

v = (10 cm² x 2 m/s) / 5 cm²

= 4 m/s

Therefore, the water would be flowing at a speed of 4 m/s through the constricted area.

10 cm² x 2 m/s = 2.5 cm² x v

Solving for v, we get:

v = (10 cm² x 2 m/s) / 2.5 cm²

= 8 m/s

Therefore, the water would be flowing at a speed of 8 m/s through the constricted area.

10 cm² x 2 m/s = 20 cm² x v

Solving for v, we get:

v = (10 cm² x 2 m/s) / 20 cm²

= 1 m/s

Therefore, the water would be flowing at a speed of 1 m/s through the expanded area.

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Answer:

ground Waves

Explanation:

The drift mobility of electrons in Cu is the ratio of the electric field to the charge carried by an electron and the time it takes for an electron to reach from one end of a conductor to the other under an applied electric field.

The Hall coefficient is defined as \(RH = (1/ne) * (dVH/dB)\) where n is the charge density, e is the charge of an electron, VH is the Hall voltage, and B is the magnetic field. To calculate the drift mobility of the electrons in Cu, we will first determine the charge density n using the Hall coefficient.

We can then use the conductivity and charge density to calculate the drift mobility. Given, Hall coefficient \(RH = 0.45 × 10^-10 m^3/A s\)  and Conductivity \(σ = 6.5 /ohm\) meter at a temperature of 400K. (Magnetic field)

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There are 12 more squares than triangles on a poster that has a mixture of 36 squares and triangles. The task is to determine the number of triangles on the poster.

To solve this problem, we can set up an equation. Let's represent the number of squares as "x" and the number of triangles as "y". Given that there are 12 more squares than triangles, we can write the equation: x = y + 12. We also know that the total number of squares and triangles on the poster is 36, so we can write another equation: x + y = 36.

Now, we can substitute the value of x from the first equation into the second equation: y + 12 + y = 36.
Simplifying the equation, we get: 2y + 12 = 36.
Subtracting 12 from both sides, we have: 2y = 24.
Dividing both sides by 2, we find: y = 12.
Therefore, there are 12 triangles on the poster.
In conclusion, the number of triangles on the poster is 12.

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Answer:

b

Explanation:

The chi-square test assumes that the variables being analyzed are measured at a nominal or ordinal level of measurement.

In statistics, the level of measurement refers to the nature and properties of the data being collected. There are four levels of measurement: nominal, ordinal, interval, and ratio. Nominal and ordinal levels are considered categorical, while interval and ratio levels are considered numerical. The chi-square test is specifically designed for analyzing categorical data, where the observations can be classified into distinct categories or groups. It is used to determine whether there is a significant association or relationship between two categorical variables.

The test calculates the difference between the observed frequencies and the expected frequencies under the assumption of independence between the variables. It compares the observed and expected frequencies using a chi-square statistic and determines the p-value to assess the statistical significance of the association. Therefore, the chi-square test assumes that the variables being analyzed are measured at a nominal or ordinal level because it deals with categorical data and evaluates the relationship between different categories or groups.

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Answer:

stopping distance = thinking distance + braking distance

Condition of the car : if the condition is bad it will increase the stopping distance as if the car brakes or tyres are in poor condition the braking distance will increase

Condition of the driver : if he is on drug or alcohol or he is tires or he has distractions then ( basically in bad condition ) . The stopping distance will increase as thinking  distance will increase .

Weather  : if it is snowing or there is bad weather conditions then stopping distance will increase as braking distance will increase

Road surface : bad conditions( broken or dust)  will increase braking distance   so therefore the stopping distance will increase  

Saturn is the following planet or moon, and its atmosphere is primarily made of hydrogen with a small amount of methane.

The correct answer is B

The planet Saturn is incredibly large and its rings make it incredibly gorgeous. Amazing moons as Titan reside there as well. The Solar System's Saturn is arguably the most popular and stunning planet. Compared to the rings of other planets, Saturn's are much larger and easier to see.

Then, only a year ago, researchers found a second Earth-like planet around Proxima Centauri, one of our nearest nearby stars. The best option we now have for maintaining human life is this planet.

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The work done in stretching the spring from its natural length to 8 inches beyond its natural length is 96 lb-in.

Work done on the spring is calculated by the formula:

W = 1/2 kx². Where k is the spring constant and x is the distance the spring is stretched beyond its natural length.

The spring constant can be calculated from the force required to hold the spring stretched 4 inches beyond its natural length. It is defined as the force required to stretch the spring one unit of distance beyond its natural length.

Thus, k = F/x = 12/4 = 3 lbf/in.

To calculate the work required to stretch the spring from its natural length to 8 inches beyond its natural length, we need to find the distance by which the spring has been stretched. The additional stretch is given by the difference between the final position and the initial position of the spring.

Thus, the additional stretch is x = 8 - 0 = 8 inches.

Substituting the values of k and x in the formula for work, we get,

W = 1/2 kx² = 1/2 * 3 * 8² = 96 lbf·in

Therefore, the work done is 96 lb-in.

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In the  tetherball game, struck ball whirls around a pole. The vertical component of the tension balances the weight and the horizontal component of tension provides the centripetal force that points toward the center of the circle.

There are two forces acting on a tether ball as it is rotating in uniform circular motion. The force of tension acts along the rope while the weight acts in downward.

The ball will move in a circular motion due to centripetal force and the tether which keeps the ball linked to the pole pulling to the center. For centripetal force, the tether can be an actual object, like a chain, or it may be a force, like gravity that acts like a tether.

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The big bang theory states that the universe is approximately 13.8 billion years old. The Big Bang is a scientific theory that describes how the universe originated from a tiny, dense state and then expanded rapidly.

This theory is supported by a significant amount of evidence, including the cosmic microwave background radiation and the observed abundance of light elements.The Big Bang theory is the most widely accepted scientific theory of the origin of the universe.

It is based on the idea that the universe was created in a single moment of time, and has been expanding ever since. According to the Big Bang theory, the universe is about 13.8 billion years old.

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force= mass × acceleration

No, the elastic potential energy stored in the pole of a pole vaulter is not the only type of potential energy involved in pole-vaulting.

In pole-vaulting, there are multiple forms of potential energy involved. While the elastic potential energy stored in the pole plays a crucial role, other forms of potential energy include gravitational potential energy and kinetic energy.

1. Elastic Potential Energy: The pole used in pole-vaulting is typically made of flexible materials, such as fiberglass or carbon fiber, which store elastic potential energy when bent or compressed. This stored energy is then released, propelling the vaulter upwards.

2. Gravitational Potential Energy: As the vaulter reaches the highest point of their vault, they have gained gravitational potential energy due to their increased height above the ground. This potential energy is converted into other forms of energy as the vaulter descends.

3. Kinetic Energy: Throughout the vaulting process, the vaulter's body also possesses kinetic energy, which is the energy of motion. The vaulter's initial speed and subsequent acceleration contribute to their kinetic energy, allowing them to gain momentum and clear the bar.

Therefore, while the elastic potential energy stored in the pole is an important component, there are other forms of potential energy involved in pole-vaulting, namely gravitational potential energy and kinetic energy.

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Answer:

\(150 kg\cdot m/s\)

Explanation:

Same as if he was walking uphill, or horizontally. Momentum is defined as the product of mass times velocity. \(p = mv = 15\cdot 10 = 150 kg\cdot m/s\)

The correct option is (a) Cocoa beans are used to make cocoa.

Cocoa bean shapes during manufacture The dried and fully fermented seed of Theobroma cacao, usually known as the cocoa bean or simply cocoa, is where cocoa solids and cocoa butter are extracted.

The dried, fully fermented cacao grain known as Theobroma is what is commonly referred to as a cacao bean or a cocoa bean. Solids, a mixture of nonfat substances, and cocoa butter, or lard, can be extracted from Theobroma cacao. The chocolate and meals from Mesoamerica were made from these cacao beans. As a result, cacao beans are used to create chocolate.

Hence, cocoa is made from cocoa beans.

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Answer

Explanation: Ok so I had a lot of trouble with this too. What I did was get some butter beans and put them under my pillow (If you don't have butter bens then butter works but must be unsalted country croks butter. I can't believe it's not butter will not work because the spirit people know and will put a spell on you. Then you get a 8lb. sweet potato and tie it to a piece of tweed and hand it on your fan at the highest setting until it flies out the string. Where ever it lands is where you sleep. Sleep with the potato where it landed. 30 minutes before you go to bed brush your teeth with a special drink.

Drink Ingredients:

2 spinach leaves

1 ounce of maple syrup

3 spoons of coco butter

1 rabbit ear

7 bear hairs

2 toe nail clipping form your dad (If you don't have one then I would give up)

When you drink this and go to sleep dream about the magical elves and eaves that will come to you in your dream. They'll give ask you a question where you will answer "Yes papas fritas"

A large disformed mutant will appear. Don't be afraid. Approach with confidence.

After that a glowing door will appear and BAM you're shifting.

*Pls note this could end in serious harm and danger I do not recommend attempting as it can result in death, a coma, or other injury. Have a Beautiful day :)

The law of universal gravitation says that each physical object attracts every other entity with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

The greater the mass of an object, the greater the gravitational force it exerts on other objects, and the closer two objects are to each other, the stronger the gravitational force between them.

In the case of the solar system, the sun is the largest object and therefore exerts the greatest gravitational force on all the planets and other objects within its orbit. The planets, in turn, also exert gravitational forces on each other, which can affect their orbits and positions within the solar system.

Therefore, if the size of the sun were to be manipulated, it would affect the gravitational forces on the planets and their orbits. Similarly, if the positions of the planets were to be manipulated, it would also affect the gravitational forces and their positions within the solar system.

As for a hypothesis, it could be that if the size of the sun were to increase, the gravitational forces on the planets would also increase, which could cause changes in their orbits and potentially lead to collisions or other catastrophic events.

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For a successful final touch of a construction venture, key stakeholders consisting of the consumer/proprietor, architect/layout group, and creation contractor are crucial. Risk management is necessary to perceive and mitigate capacity risks, ensuring project success and minimizing disruption

The 3 important stakeholders for the development of a new mall in Alexandra are:

During the construction of an avenue in a particular network, the network is represented by:

Local Authorities: The local authorities, which include the municipal or city council, represent the community's pastimes. Their duties consist of engaging with the network to apprehend their needs and issues associated with the road construction project.

Before any sort of Civil Engineering mission is executed, the subsequent steps want to be taken to ensure the viability of the challenge:

The hierarchy of running for a contractor sporting out the development of a bridge typically consists of the subsequent degrees:

To draw the bar chart (also referred to as a Gantt chart) for a 50 km street creation undertaking with a duration of 10 days, the chart could represent the obligations and their respective intervals. However, a standard bar chart for an avenue creation undertaking may also include duties including surveying, excavation, laying subbase, paving, and street markings, amongst others.

The horizontal axis represents the timeline (in days), and the vertical axis represents the responsibilities. Each undertaking is represented with the aid of a horizontal bar that suggests its length.

Question 2 (10):

2.1 Risk control is vital in a venture for the following motives:

Overall, change management is important for figuring out, analyzing, and responding to risks in a systematic and proactive manner. It enables ensuring task success by using lowering uncertainties and maximizing opportunities for task delivery within the preferred parameters.

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Answer:

Given,

  mass of man = 100 N = 10 kg

   height = h = 25m

   since the man does not move anything with his force, work done by him is zero

   work done on the man = gain in potential energy

   P.E=mgh

   P.E=10×9.8×25

  P.E=2.45KJ

Explanation:

so, potential energy gained by man is 2.45 KJ

Answer:

13

Explanation:

34

The magnetizing current of a transformer does not lie in-phase with the applied voltage. It lags the applied voltage by a small angle.

Magnetizing current

No, the magnetizing current of a transformer does not lie in-phase with the applied voltage. It is slightly lagging behind the applied voltage by a small angle. This is because the transformer core has a small amount of resistance, which causes a small voltage drop across the core. This voltage drop is in-phase with the current, and it causes the current to lag behind the voltage by a small angle.

When the transformer core is saturated, the magnetizing current increases sharply. This is because the core becomes increasingly difficult to magnetize as it approaches saturation. The increased magnetizing current causes the transformer to lose efficiency and to produce more heat.

Inrush current

The inrush current of a transformer can cause a number of problems, including:

Overloading the transformer

Tripping the transformer's protective devices

Damaging the transformer's windings

Starting a fire

Even at no-load, a transformer draws a small amount of current from the mains. This current is called the magnetizing current. The magnetizing current is required to create the magnetic field in the transformer core. The magnetic field is necessary to induce the voltage in the secondary winding.

Exciting resistance and exciting reactance

The exciting resistance of a transformer is the resistance of the transformer core. The exciting reactance of a transformer is the reactance of the transformer's windings. The exciting resistance and exciting reactance together form the transformer's impedance.

Transformers are not designed to operate in the saturated region. The saturated region is a region where the core is unable to produce any additional magnetic flux. This can cause a number of problems, including:

Increased magnetizing current

Decreased efficiency

Increased heat generation

Transformers are designed to operate in the linear region, where the core is able to produce a linear relationship between the applied voltage and the induced voltage. This allows the transformer to operate efficiently and to produce the desired amount of power

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Answer:

For, heating purposes more the quantity of  water more will be the heating. Clearly, underground heating would have more water and hence, it will have edge over the  water heater system.

Moreover, for things at the same temperature, the thing with more molecules has more total kinetic energy (thermal energy) than the thing with fewer molecules. The groundwater heating system uses heat from the heat stored naturally in groundwater or aquifers. Thus, saving the cost of power required to heat in normal water heater.

Explanation:

The groundwater heating system will warm the school more than the water heater system due to the fact that it uses more water more than the other system.

Based on the complete question, it should be noted that the addition of energy leads to an increase in motion which results in the rise in temperature.

The groundwater heating system will warm the school more than the water heater system due to the fact that it uses more water more than the other system even though its water isn't as warm as in the other system.

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2 equal-mass entities are positioned at heights of h/2 and h, respectively. Their gravitational potential energy ratio is 1:4.

potential energy= mgh (h= H/2) potential energy for an item at H

Potential energy of the item is given by 2H= mg₂H (h=2H) mg(H/2)/ mg₂H = 1/4, resulting in a ratio of 1:4.

The energy that an item has as a result of being in a gravitational field is known as gravitational potential energy. It is a type of potential energy as it is the energy that an item would release if it moved in response to gravity.

For example, when an object is lifted to a certain height above the ground, it gains gravitational potential energy because it is now further away from the center of the Earth and has the potential to fall back down and release that energy. The amount of gravitational potential energy gained by the object is proportional to its mass, the acceleration due to gravity, and the height above the ground.

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Answer:

OPTION D 5 m/s

Explanation:

0.5 × 12 × v² = 150

sqrt(150/6) = v

v = 5 m/s

Einstein's analysis of the photoelectric effect was instrumental in establishing the concept of quantized energy and the existence of individual particles, known as photons.

Photons are fundamental particles of light and electromagnetic radiation. They are considered to be the carriers of electromagnetic force and exhibit properties of both particles and waves. Photons have zero rest mass, travel at the speed of light in a vacuum (c), and possess energy and momentum.

According to quantum theory, photons are quantized packets of electromagnetic energy. They are emitted and absorbed by charged particles when they transition between energy levels. The energy of a photon is directly proportional to its frequency, as described by the equation E = hf, where E is energy, h is Planck's constant, and f is the frequency. Photons can behave as waves, demonstrating interference and diffraction, and they can also exhibit particle-like behavior, such as momentum transfer during collisions. This duality is a fundamental aspect of quantum mechanics.

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