PLS HELP DUE AT 10 PM

Answer:

3.5kgm/s

Explanation:

We can calculate the momentum of Julieta

momentum = m(v-u)

Momentum = 0.2(20-2.5)

Momentum = 0.2(17.5)

Momentum = 3.5

Hence the momentum of Julieta is 3.5kgm/s

Explanation:

Forms of energy

There are many different types of energy, which all fall into two primary forms – kinetic and potential. Energy can transform from one type to another, but it can never be destroyed or created.

Burning Questions

What are the different types of energy?

Types of energy can be categorised into two broad categories – kinetic energy (the energy of moving objects) and potential energy (energy that is stored). These are the two basic forms of energy. The different types of energy include thermal energy, radiant energy, chemical energy, nuclear energy, electrical energy, motion energy, sound energy, elastic energy and gravitational energy.

Discover the different types of energy

Thermal Energy

Thermal (Heat) Energy

Thermal energy is created from the vibration of atoms and molecules within substances. The faster they move, the more energy they possess and the hotter they become. Thermal energy is also called heat energy.

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Chemical Energy

Chemical Energy

Chemical energy is stored in the bonds of atoms and molecules – it is the energy that holds these particles together. Stored chemical energy is found in food, biomass, petroleum, and natural gas.

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Nuclear Energy

Nuclear Energy

Nuclear energy is stored in the nucleus of atoms. This energy is released when the nuclei are combined (fusion) or split apart (fission). Nuclear power plants split the nuclei of uranium atoms to produce electricity.

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Electrical Energy

Electrical Energy

Electrical energy is the movement of electrons (the tiny particles that makeup atoms, along with protons and neutrons). Electrons that move through a wire are called electricity. Lightning is another example of electrical energy.

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Radiant Energy

Radiant Energy

Also known as light energy or electromagnetic energy, radiant energy is a type of kinetic energy that travels in waves. Examples include the energy from the sun, x-rays, and radio waves.

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light Energy

Light Energy

Light energy is a form of electromagnetic radiation. Light consists of photons, which are produced when an object's atoms heat up. Light travels in waves and is the only form of energy visible to the human eye.

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Motion Energy

Motion Energy

Motion energy – or mechanical energy – is the energy stored in objects; as objects move faster, more energy is stored. Examples of motion energy include wind, a flowing river, a moving car, or a person running.

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Sound Energy

Sound Energy

Sound energy is the movement of energy through substances. It moves in waves and is produced when a force makes an object or substance vibrate. There is usually much less energy in sound than in other forms of energy.

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Elastic Energy

Elastic Energy

Elastic energy is a form of potential energy that is stored in an elastic object - such as a coiled spring or a stretched elastic band. Elastic objects store elastic energy when a force causes them to be stretched or squashed.

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Gravitational Energy

Gravitational Energy

Gravitational energy is a form of potential energy. It is an energy associated with gravity or gravitational force – in other words, the energy held by an object when it is in a high position compared to a lower position.

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What is the Law of Conservation of Energy?

While it might sound complex, the First Law of Conservation of energy simply states that energy can never be created or destroyed, but it can be transformed from one type to another.

What Do You Mean?

Types of Energy Diagram

Energy can be transformed from one form to another in different ways.

Kinetic energy is the energy of a moving object.

Potential energy is energy that is stored in an object or substance.

The Law of Conservation of energy is that energy can be transformed from one form to another, but can be neither created or destroyed.

Energy Transformations see diagram…

Notice that these energy transfer examples only show the useful energy transfers. However, car engines are also noisy (sound energy) and hot (thermal energy) and electric lamps also give out heat energy.

Cool Facts

The use of the word 'energy' dates all the way back to the 4th century BC.

Cool Facts

The word energy comes from the Greek word 'energeia', meaning 'activity.

Cool Facts

The use of the word 'energy' dates all the way back to the 4th century BC.

Cool Facts

The word energy comes from the Greek word 'energeia', meaning 'activity.

Speedy Summary

Energy transferred

Sunlight energy is converted into the chemical energy of glucose.

Energy comes in many different types, which can be categorised into two basic forms – kinetic and potential. Energy can never be created or destroyed, but it can be transformed from one type of energy to another.

Explanation:

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(c): Accelerate downward at some value less than g - is correct.

Because the center of mass of the two objects will accelerate downward with a value of g, regardless of the relative masses of the two objects, as long as there is no significant air resistance or friction.

This is because the gravitational force on the two objects is equal and opposite, so the net force on the system is the weight of the more massive object minus the weight of the less massive object, which is proportional to the acceleration due to gravity (g).

This is a consequence of Newton's laws of motion and the principle of conservation of momentum.

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Answer:

elements

not really an explanation

Answer:

0.203 kN

Explanation:

203 N *(1 kN/1000N) = 0.203 kN

Answer:

where is the number line? I'm not sure what I'm supposed to be looking at.

The efficiency of a single movable pulley is not 100 % because the applied load is half of the load to be lifted.

MA = Fo / Fi

MA = Mechanical advantage

Fo = Output force

Fi = Input force

In a single movable pulley,

Fi = 0.5 Fo

MA = Fo / 0.5 Fo

MA = 2

Efficiency = MA * 100

Efficiency = 2 * 100

Efficiency = 200 %

A movable pulley does no have a fixed axis of rotation. In a movable pulley the forces are multiplied at the other end. So the effort required to pull the load is easier than a fixed pulley.

Therefore, the efficiency of a single movable pulley is not 100%

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A lagerstätten deposit is a type of sedimentary rock formation that preserves exceptional fossils with exceptional detail and diversity, often due to rapid burial in a low-oxygen environment. Another similar deposit from the Paleozoic era that contains evidence of diverse early multicellular life is the Burgess Shale formation in Canada.

A lagerstätten deposit is a kind of sedimentary rock formation that frequently results from fast burial in a low-oxygen environment and retains remarkable fossils with exceptional detail and diversity.

The Burgess Shale formation in Canada is another Paleozoic deposit that exhibits signs of various early multicellular organisms.

The Burgess Shale is particularly well-known for its preservation of soft-bodied organisms from the Cambrian period, which has greatly expanded our understanding of the early evolution of life on Earth.

Archaeopteryx is preserved in a Lagerstätten deposit in Germany. A Lagerstätten is a sedimentary deposit that contains exceptionally well-preserved fossils, providing detailed information about the organisms and their environment.

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The characteristic of X-rays make them useful for creating images of the skeletons of humans and other animals. X-rays are absorbed by denser tissues. Hence option 1 is correct.

Skeleton system is defined as the skeleton that makes up the human body. At birth, it has about 270 bones; at adulthood, after certain bones have fused together, it has about 206 bones. It is made up of tendons, ligaments, cartilage, and bones that link the two.

The density of the substance that X-ray beams pass through as they move through your body affects how much of it is absorbed. Dense materials like bone and metal show white on X-rays. The air in your lungs seems to be black.

Thus, the characteristic of X-rays make them useful for creating images of the skeletons of humans and other animals. X-rays are absorbed by denser tissues. Hence option 1 is correct.

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It is reflected by the surface of the Earth, reflected by clouds, and upper atmosphere.

The energy balance between the earth and atmosphere is reached when the energy from the Sun equals the energy that is lost by the Earth back into space. When it reaches the Earth, a portion of it is absorbed by the atmosphere, a portion is reflected back into space by clouds, and a portion is absorbed at the planet's surface. The Earth emits lesser (long wavelength) infrared light than the Sun because it is much cooler than otherwise.

The various surfaces that the solar radiation comes into contact with provide it the opportunity to undergo a variety of varied experiences. When solar radiation strikes the Earth, some of it is absorbed by the planet and some is reflected back into space.

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The voltage of the circuit will be 0.75 V.The potential difference between the circuit is known as the voltage.

Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.

This current-voltage connection may be expressed mathematically as,

The Equation of Ohm's Law

\(\rm V=IR \\\\ V= 0.05 \times 15.2 \\\\\ \rm V=0.75 \ V\)

The voltage of the circuit will be 0.75 V.

Hence option D is correct.

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Answer:

Answer:

Carbon Dioxide

The acceleration of the box is best calculated to be equal to 3.06m/s²

We would first compute the magnitude of the kinetic frictional force in order to determine the size of the acceleration of this box.

The following equation can be used to determine the kinetic frictional force acting on a physical body mathematically:

F = μkN = μk(mg)

F = 0.30 × 5.0 × 9.81

F = 14.7Newton.

Newton's second law of motion is used to calculate the net force, which is as follows:

∑Fx = Applied force - kinetic frictional force = ma

Acceleration, a = [Applied force - kinetic frictional force]/m

Acceleration, a = [30 - 14.7]/5

Acceleration, a = 15.3/5

Acceleration, a = 3.06m/s²

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Answer:

the magnets share forses when they come in contact with the other making them the same

Answer:

Explanation:

Statement A: Increasing a moving average window will enhance noise dampening.

Statement B: Decreasing a moving average window will enhance impulse response.

Statement C: Increasing the smoothing constant in exponential smoothing will enhance impulse response.

Statement D: Decreasing the smoothing constant in exponential smoothing will enhance noise dampening.

Let's evaluate each statement:

A. Increasing a moving average window will enhance noise dampening.

This statement is true. Increasing the window size of a moving average smooths out the fluctuations in the data and reduces the effect of noise, thus enhancing noise dampening.

B. Decreasing a moving average window will enhance impulse response.

This statement is false. Decreasing the window size of a moving average reduces the number of data points considered, leading to less smoothing and a faster response to changes in the data. It does not enhance impulse response.

C. Increasing the smoothing constant in exponential smoothing will enhance impulse response.

This statement is false. Increasing the smoothing constant in exponential smoothing increases the weight given to more recent data points, which results in smoother and more stable forecasts. It does not enhance impulse response.

D. Decreasing the smoothing constant in exponential smoothing will enhance noise dampening.

This statement is true. Decreasing the smoothing constant in exponential smoothing gives more weight to past observations, which helps in reducing the impact of noise and enhances noise dampening.

Based on the evaluation, 2 out of the 4 statements are correct.

The force of air resistance is approximately 3987 N.

Air resistance, also known as drag, is the force that opposes the motion of an object through a fluid (such as air). It arises from the interaction between the object and the fluid, and depends on factors such as the object's shape, size, speed, and the properties of the fluid (such as its density and viscosity). In the case of a helicopter flying horizontally, air resistance pushes against the direction of motion, and its magnitude is equal to the horizontal component of the lift force.

To find the force of air resistance, we need to resolve the lift force into its horizontal and vertical components. The vertical component equals the weight of the helicopter, which we can calculate using the formula:

Weight = mass x gravity

Assuming a mass of 4500 kg and a gravity of 9.81 m/s^2, we get:

Weight = 4500 kg x 9.81 m/s^2 = 44145 N

The horizontal component of the lift force equals the force of air resistance, since the helicopter is flying horizontally at constant speed. To calculate it, we can use the formula:

Force of air resistance = Lift force x sin(81.3°)

Substituting the given values, we get:

Force of air resistance = 40500 N x sin(81.3°) = 3987 N

Therefore, the force of air resistance is approximately 3987 N.

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Answer:

C voltage

Explanation:

Voltage is the change in electric potential so basically current flows from high potential to low potential due to voltage.

For fs = 200kHz, the observed frequency will be 50kHz. For fs = 50kHz, the observed frequency will be 50kHz (aliasing).

When sampling a sinusoidal signal, the highest frequency that can be accurately represented is fs/2 (the Nyquist frequency). If the input signal frequency is higher than fs/2, aliasing occurs and the signal is incorrectly reconstructed.

For fs = 200kHz and a 150kHz input signal, the observed frequency will be 200kHz - 150kHz = 50kHz. This is within the Nyquist frequency and can be accurately reconstructed.

For fs = 50kHz and a 150kHz input signal, the observed frequency will also be 50kHz (50kHz + 50kHz = 100kHz, which is the frequency that is aliased). The signal cannot be accurately reconstructed in this case.

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Answer:

240N

Explanation:

The formula for force is F=mass×acceleration.

Therefore, Force= 120×2= 240N

Hi there!

This is an example of a recoil collision.

Let m1, v1 be Mary

Let m2, v2 be Jim

Utilize the conservation of momentum:

m1v1 + m2v2 = m1v1' + m2v2'

The initial velocities are zero (at rest), so:

0 = m1v1' + m2v2'

Let east be positive, so Jim recoils with a negative velocity:

0 = m1v1' - m2v2'

Set the two equal and solve:

m1v1' = m2v2'

m1v1'/m2 = v2'

(50)(2.5)/65 = v2' = 1.92 m/s to the WEST

To produce 5 horsepower of power, the completely reversible heat engine operating with a source at 1500 R and a sink at 500 R must be supplied with heat at a rate of approximately X BTU/h.

To calculate the rate at which heat must be supplied to the engine, we can use the formula:

Power = (Heat supplied per unit time) * (Temperature difference between source and sink)

Given that the power output is 5 horsepower, we need to convert it to the equivalent unit of BTU/h. 1 horsepower is equal to approximately 2544.43 BTU/h.

Therefore, the power output in BTU/h is 5 * 2544.43 = Y BTU/h.

Next, we calculate the temperature difference between the source and sink:

Temperature difference = Source temperature - Sink temperature

Temperature difference = 1500 R - 500 R = 1000 R.

Now, we can rearrange the formula to solve for the heat supplied per unit of time:

(Heat supplied per unit time) = Power / (Temperature difference)

(Heat supplied per unit time) = Y BTU/h / 1000 R.

Substituting the calculated values, we find:

(Heat supplied per unit time) = Y BTU/h / 1000 R = Z BTU/h.

Thus, the rate at which heat must be supplied to the engine for it to produce 5 horsepower of power is approximately Z BTU/h.

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The birth of modern physics can be attributed to the revolutionary discoveries and theories that emerged in the late 19th and early 20th centuries.

During the late 19th century, physicists were confronted with experimental results that contradicted classical physics, leading to the development of new theories. One major breakthrough was the formulation of quantum mechanics, which revolutionized our understanding of the microscopic world.

Quantum mechanics introduced the concept of quantized energy levels and probabilistic behavior of particles, challenging the determinism of classical physics. Another pivotal development was Albert Einstein's theory of relativity.

His special theory of relativity, published in 1905, redefined our understanding of space, time, and the relationship between mass and energy. General relativity, presented in 1915, provided a new framework for understanding gravity, describing it as the curvature of spacetime.

Furthermore, the field of particle physics emerged as scientists explored the fundamental constituents of matter and the forces that govern them. This branch of modern physics investigates subatomic particles and their interactions, leading to the development of the standard model, which describes the fundamental particles and three of the fundamental forces.

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To calculate the order of magnitude of the mass of a bathtub half full of water, we need to estimate the volume of water and then multiply it by the density of water.

The volume of the bathtub can be calculated by multiplying its length, width, and depth. In this case, the bathtub measures 1.3 m by 0.5 m by 0.3 m, so the volume is 0.5 m³.

Since the tub is half full, the volume of water will be half of the total volume, which is 0.5 m³ divided by 2, resulting in 0.25 m³.

The density of water is approximately 1000 kg/m³. Therefore, the mass of the water in the tub is the volume multiplied by the density: 0.25 m³ * 1000 kg/m³ = 250 kg.

To determine the order of magnitude, we can round the mass to the nearest power of ten. In this case, the mass is approximately 250 kg, which falls within the range of 10² (100) and 10³ (1000). Therefore, the order of magnitude of the mass of a bathtub half full of water is 10² or 100.

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(A)

Potential in all resistors are same (V = V1 = V2)

(B)

I = V/R

I = 12 / (4/3)

I = 9 A

A light-year is a unit of distance, specifically the distance that light travels in one year.

Light travels at a speed of approximately 299,792 kilometers per second (or about 186,282 miles per second) in a vacuum. Therefore, to determine which planet is 20 light-years away from Earth, we need to identify a planet located at a distance of approximately 20 times this speed of light.

As of my knowledge cutoff in September 2021, no known exoplanets have been directly observed and confirmed to be located exactly 20 light-years away from Earth. However, there are numerous exoplanets that have been discovered within a range of distances from Earth.

Some notable exoplanets discovered within approximately 20 light-years of Earth include:

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Explanation:

In induction, what charge does a neutral substance gain compared to the object brought near it?

The neutral object gains the same type of charge as the object that touched it because the electrons move from one object to the other (Figure 10.16). Induction is the movement of electrons within a substance caused by a nearby charged object, without direct contact between the substance and the object.

The charge gained by the neutral substance, gained compared to the object brought near it, had the same kind of charge that was present when it touched it.

The alteration of the distribution of electric charge on a substance is caused by the effect of induction. A negatively charged object brought close to an electrically neutral object causes a positive charge on the near side and a negative charge on the far side of the neutral object as a result of the electric force between charged particles that make up materials.

This very little polarization, or separation of charge, lessens the electric field inside the dielectric.

Because the electrons go from one thing into the next, the neutral object acquires the same kind of charge that was present when it touched it. Lacking physical touch, induction is the movement of electrons within a substance as a result of a nearby charged item.

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Answer:

The train's acceleration is 4.5 m/s²

Explanation:

The train's speed increased by 45 m/s after 10 seconds, which means that it's speed increased by 4.5 m/s each second, or rather 4.5m/s²

The correct answer is (b) exert an upward force on the rocket.

According to Newton's third law of motion, for every action, there is an equal and opposite reaction. In the case of a rocket, when it forces exhaust gases downward by expelling them at high speeds, the exhaust gases exert an equal and opposite force upward on the rocket.

This upward force generated by the expulsion of exhaust gases is known as the "rocket thrust." It is this thrust that propels the rocket forward by creating a reaction force that pushes the rocket in the opposite direction.

Therefore, the exhaust gases do play a crucial role in the motion of the rocket by exerting an upward force, allowing the rocket to overcome the force of gravity and achieve propulsion.

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