Which scientist was the first to propose the heliocentric model of the universe?

Answer:

40sec

Explanation:

Data

Work = 440 J

Power= 11watt

time = ?

Power = work done/time

===> time = work done/power

= 440/11

= 40sec

Ultra = X-ray

Explanation:

how are things going to paint the roof for beginners painting and decorating the whole house so I'm going away with a few sports mates for a couple nights for beginners but will have a look painting at a time and see what is going to be Strong enough

Let's name some variables:

n1: order of yellow-orange light; n1 = 3

λ1: wavelength of yellow-orange light; λ1 = 541.08 nm

n2: order of unknown light; n2 = 4

λ2: wavelength of unknown light; we will solve for this

Given these known and unknown variables, we can use the following equation to solve for λ2:

n1*λ1 = n2*λ2

Now all we have to do is plug in the variables we know and solve for λ2.

3*541.08 = 4*λ2

λ2 = 3*541.08/4

λ2 = 405.81 nm

The wavelength and speed of a wave will be the same regardless of the density of the medium.

The wavelength of a wave is determined by the source and frequency of the wave and is independent of the medium through which it travels. Similarly, the speed of a wave is determined by the properties of the medium, such as its elasticity and inertia, and not directly by its density. Therefore, when comparing the wave characteristics of a wave in two different ropes, the wavelength and speed will be the same irrespective of the density of the medium. The density of the medium may affect other properties of the wave, such as the amplitude or intensity, but not the wavelength and speed.

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The postulate of kinetic molecular theory is option (d) The kinetic energy of gas molecules depends on temperature.

Kinetic molecular theory is a model that describes the behavior of gases based on the movement of their individual molecules. It provides a framework for understanding the macroscopic properties of gases, such as pressure, temperature, and volume, in terms of the microscopic behavior of the gas molecules.

The postulate of kinetic molecular theory that states "The kinetic energy of gas molecules depends on temperature" explains the relationship between the microscopic behavior of gas molecules and the macroscopic properties of gases.

Therefore, the correct option is (d) The kinetic energy of gas molecules depends on temperature.

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The average drift velocity of the electrons is  is approximately 6.25 x 10^6 m/s.

To find find the average drift velocity of the electrons, we have to make use of the drift velocity formula. The drift velocity formula is used to relate the average drift velocity of charge carriers in a conductor to the applied electric field. It is used to understand the motion of electrons when an electric current is flowing.

The drift velocity formula is:

\(I = nAvq\)

Where:

I is the current (in Amperes),

n is the density of charge carriers,

A is the cross-sectional area of the wire,

v is the average drift velocity of electrons,

q is the charge of an electron.

In this case, we have been given current as 10A, cross-sectional area of the wire is 1mm². The density of charge carriers in the wire is 1027/m³. So, by substituting all the given identities in the equation and rearranging the equation to find out "v", we get:

\(v = I / (nAq)\)

\(v = (10 A) / ((10^{27} /m^{3} ) * (1 * 10^{-6} m^{2}) * (1.6 * 10^{-19} C))\)

\(v = (10 A) / (1.6 * 10^{-12} A * m^{2} * C * 10^{27} /m^{3} )\)

\(v = 6.25 * 10^{6} m/s\)

Therefore, the average drift velocity of electrons in the wire is approximately 6.25 x 10^6 m/s.

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Answer:

Average drift velocity of the electrons is Approx. 6.25*10^6 m/s.

Given, Current= 10A

Cross sectional area = 1mm^2

Density of charge= 1027/m^3

Formula to find velocity= I/(nAq)

= 10/(1027*1*10^-6*1.6*10^-19)

=6.25*10^6m/s

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The spring with spring constant k = 11 N/m is stretched at a distance of 0.25 m and the force of the spring is 2.75 N.

Hooke's law states that the applied force is directly proportional to the displacement or change in length of the spring. F ∝ x, where x is the displacement. It is also defined as, F = -Kx, where k is the proportionality constant or force constant. F acts as a restoring force that returns the object to its original state, minus sign is used to indicate the force is restoring force.

From the given,

spring constant (k) = 11 N/m

displacement of spring = 0.25 m

The restoring force, F = - kx

F = - (11×0.25)

 = - 2.75 N

Thus, the restoring force is 2.75 N.

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Answer:

C

Explanation:

The composition of a comet compared with that of the Sun is C "Comets are made of ice and dust, while the Sun is made of gas".

Comets are small, icy bodies that originate from the outer solar system and are composed mainly of frozen water, carbon dioxide, methane, and ammonia, along with dust and small rocky particles. When a comet approaches the Sun, its icy material vaporizes, creating a glowing coma (a hazy atmosphere around the nucleus) and a tail that points away from the Sun due to the solar wind.

On the other hand, the Sun is a giant ball of hot, glowing gas, composed mainly of hydrogen (about 73% of its mass) and helium (about 25% of its mass), with trace amounts of other elements like oxygen, carbon, and iron. The Sun generates energy through nuclear fusion reactions in its core, which convert hydrogen into helium and release a tremendous amount of energy in the process.

Therefore, the composition of a comet is quite different from that of the Sun. While both objects contain some water (in the form of ice for comets and vapor for the Sun), comets are predominantly made of ice and dust, while the Sun is predominantly made of gas, with only a small amount of solid material in its core.

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Answer:

g e c a

Explanation:

Hope I helped!

The speed of a train that moves from a train station at 30 meters per second after 5 seconds and covers a distance of 100 m with an acceleration of ten meters per second square would be 80 m/s.

We can use the equation of motion to solve for the final velocity of the train:

v = u + at

where:

Substituting the values, we get:

v = 30 + 10(5)

v = 80 m/s

Therefore, the speed of the train after 5 seconds is 80 m/s.

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The uncertainty in the electron's speed is approximately 3.87 × \(10^4}\) m/s.

According to the Heisenberg uncertainty principle, there is a fundamental limit to the precision with which certain pairs of physical properties, such as position and momentum, can be known simultaneously. The uncertainty principle states that the product of the uncertainties in the measurements of position (Δx) and momentum (Δp) must be greater than or equal to Planck's constant divided by 4π.

Mathematically, the uncertainty principle is expressed as

Δx * Δp \(\geq\) h / (4π)

Here, Δx represents the uncertainty in position, and Δp represents the uncertainty in momentum. However, momentum can be calculated using the equation

momentum (p) = mass (m) * velocity (v)

Rearranging the equation, we have

velocity (v) = momentum (p) / mass (m)

To determine the uncertainty in speed, we need to calculate the uncertainty in velocity. Assuming we are dealing with an electron, we can use the known mass of an electron (m) and the uncertainty principle.

The mass of an electron (m) is approximately 9.10938356 × \(10^{-31}\) kg, and Planck's constant (h) is approximately 6.62607015 × \(10^{-34}\) J·s.

Given the uncertainty in position (Δx) of 12 nm (converted to meters)

Δx = 12 nm = 12 × \(10^{-9}\) m

Using the uncertainty principle equation, we can solve for Δp

Δx * Δp  \(\geq\)  h / (4π)

(12 × \(10^{-9}\)) * Δp  \(\geq\)  (6.62607015  × \(10^{-34}\)) / (4π)

Δp  \(\geq\)  (6.62607015 × \(10^{-34}\)) / (4π * 12 × \(10^{-9}\))

Δp  \(\geq\)  3.527 × \(10^{-26}\) kg·m/s

Now, we can calculate the uncertainty in velocity (Δv) by dividing the uncertainty in momentum (Δp) by the mass of the electron (m):

Δv = Δp / m

Δv = (3.527 × \(10^{-26}\) ) / (9.10938356 × \(10^{-31}\))

Δv = 3.87 × \(10^4}\)  m/s

Therefore, the uncertainty in the electron's speed is approximately 3.87 × \(10^4}\) m/s.

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Answer:

Roundworms:

The size of roundworms ranges from microscopic to as long as a meter long. Most roundworms have a hard, sharp lance on their head, and some have bristles on the head. Most of the roundworms are protected by an adaptable yet solid, furrowed body covering.  

Roundworms are very primitive living beings, having no respiratory or circulatory system of a host. They have an empty body with two openings at the closures. Be that as it may, the head isn't particular or recognizable to the unaided eye.  

Roundworms reproduce sexually and can finish their life cycle in immature puppies, however as the little pupps immunity system develops (for the most part by a half-year-old enough), the larval phases of the roundworm will become captured and will encyst (become encased in a sore) in the puppy's muscles. They can stay encysted in the pooch's tissues for a considerable length of time or years.

The minimum amplitude of the resultant pulse is 10 cm.

The amplitude of a pulse is the maximum height of the waveform measured from the baseline, also known as the peak-to-peak amplitude. In the case of two pulses, A and B, the minimum amplitude of the resultant pulse is determined by the vector sum of the individual amplitudes of the two pulses.

When two pulses are in phase, the resultant pulse amplitude is the sum of the individual amplitudes, which in this case is 20 cm + 10 cm = 30 cm.

However, if the two pulses are out of phase, the minimum amplitude of the resultant pulse is determined by the difference between the amplitudes of the two pulses. In this case, the minimum amplitude of the resultant pulse would be |20 cm - 10 cm| = 10 cm.

So, the minimum amplitude of the resultant pulse is 10 cm.

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Answer:

B

Explanation:

Answer:

middle

top

bottom

under neith middle

Her mass is approximately equal to 27 kilograms.

First of all, you need to understand that momentum is a conserved quantity and the solution to this problem involves elastic collision.

Momentum can be defined as p = mv where p is momentum, m is mass, and v is velocity. Just like energy, momentum is a physical quantity that is conserved in an isolated system. Momentum is conserved as a result of Newton's third law, which states that \(F_A=-F_B\).

You are given that the ice skaters bounce off each other, meaning the collision is elastic. Remember that in an elastic collision, m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂ where

Suppose that m₁ = 49 kg, m₂ = x, u₁ and u₂ = 0 m/s, v₁ = 2.1 m/s, and v₂ = 3.81 m/s. Then the mass of the other ice skater is as follows:

49 · 0 + x · 0 = 49 · 2.1 + x · 3.81

0 = 102.9 + 3.81x

3.81x + 102.9 = 0

3.81x = -102.9

x ≈ -27

Since a mass value can't be negative, the absolute value of x is 27. Therefore, it's her actual mass in kilograms.

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At every location along the string, the amplitudes of two waves that interfere with one another are added. The two separate waves combine to form the final wave.

Two transverse waves are present in this instance, one traveling to the right and the other to the left. The waves will interact destructively when they meet since their motions are in opposition.

The resultant wave f(x) at any point x on the string may be calculated by summing the two amplitudes if we let f1(x) represent the amplitude of the wave going to the right and f2(x) represent the amplitude of the wave moving to the left:

f(x) = f1(x) + f2(x)

The amplitudes of the two waves will be equal in size and facing in opposite directions when they collide. As a result, the amplitude that results will be zero, and the string will then be at rest.

The resulting wave will alternate between constructive and destructive interference as the waves continue to travel past one another.

As a result, the string will develop a pattern of nodes (points of zero displacements) and antinodes (points of maximum displacement).

The combined frequency and wavelength of the various waves as well as the rate of wave propagation along the string will determine the final wave's frequency and wavelength.

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Answer:

organism is false

Explanation:

The heart is an organ and not an organism because,

An organism is a group of systems that performs a specific function.

An organ is a group of tissue that performs a specific function

Answer:

a=1.25m/s²

Explanation:

GIVEN DATA

vi=10m/s

vf=15m/s

S=5m

TO FIND

a=?

SOLUTION

by using third equation of motion

2as=(vf)²-(vi)²

2a(5m)=(15m/s)²-(10m/s)²

10m×a=225m²/s²-100m²/s²

10m×a=125m²/s²

a=\(\frac{125}{10}\)

a=12.5m/s²

The corona is the Sun's topmost layer, extending millions of kilometers into space. Option A is correct.

The Sun's atmosphere consists of several layers, each with its own distinct properties and characteristics. The corona is the outermost layer of the Sun's atmosphere, extending millions of kilometers into space. It is composed of extremely hot and ionized gas, with temperatures reaching several million degrees Celsius.

The corona is visible during a total solar eclipse as a white halo around the Sun. The corona is an important area of study for astronomers and astrophysicists, as it plays a key role in the Sun's magnetic field and in the solar wind, a stream of charged particles that flows out from the Sun and affects the space weather around Earth. Option A is correct.

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Animals have been known to exhibit unusual behavior before a storm. This could be due to their keen sense of smell and hearing, along with sensitive instincts. Dogs may also sense the change in barometric pressure that comes with storms, causing them to bark, cuddle, or hide in an attempt to seek shelter.

but in other hand humans did not have much power of smell and hearing therefore they cannot able to foretell.

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In Stratosphere layer  the Concorde cruise, the troposphere wouldn't carry the Concorde. The temperature increases with weight in stratosphere.

The stratosphere layer is one of the layers of the atmosphere on Earth. In an upward direction, it is the second layer of the atmosphere. Right under the stratosphere is the lowest layer, the troposphere. The mesosphere is the stratosphere's higher-level neighbour. At mid-latitudes, the stratosphere's bottom is located around 10 kilometres (6.2 miles, or about 33,000 feet) above the surface. A 50 km altitude marks the stratosphere's highest point (31 miles). With latitude and seasonal changes, the height of the lower stratosphere varies. When compared to the poles, the lower boundary of the stratosphere can range from 7 km (4 miles) to 20 km (12 miles), or a height of 65,000 feet, close to the equator.

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Why Concorde jet was not cruise in Troposphere?

The statement describes an advantage of recorded presentations is that the audience members have the opportunity to provide feedback. Thus, the correct option for this question is C.

A recorded presentation may be defined as a popular format of multimedia content with a duration of several seconds or minutes that significantly expresses the advantages of a product, service, or any idea with the support of interesting graphic images, concise text, and appropriate narration.

According to the context of this question, a recorded presentation delivers an advantage to the audience to provide feedback. This is because the process of recorded PowerPoint presentation gives the actual sense and understanding to the audience similar to the real event.

Therefore, the correct option for this question is C.

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Answer:

a. normal

Explanation:

In the field of physics the normal is a line drawn at a right angle to a barrier. In other words the normal line is the line that is drawn perpendicular (right angle, 90 degrees) to the reflective surface of a mirror, or the particular boundary in which refraction occurs at the point of incidence of a light ray. This can be seen in the picture attached below.

Answer:

I have no clue sorry I wish I could help

Explanation:

the switch and the battery

A 1987 205 cubic inch V6 Mercruiser 4.3 engine with 575 hours on it does not necessarily have too many hours with potential breakdowns in the near future, as long as it has been well-maintained and shows no major signs of wear and tear.

The number of hours on an engine is just one factor to consider when determining the potential for breakdowns. Other factors such as maintenance history, usage conditions, and overall condition of the engine can also play a role.

With that being said, 575 hours on a 1987 4.3 Mercruiser engine is not necessarily an alarming number, as these engines are known for their durability and longevity. However, it is important to have the engine inspected and properly maintained to ensure it continues to run smoothly. Regular maintenance and inspections can help prevent potential breakdowns and extend the life of the engine.

1. Assess the average lifespan of a Mercruiser 4.3 engine. Generally, these engines can last anywhere from 1,500 to 2,000 hours with proper maintenance.

2. Evaluate the maintenance history of the engine. Regular maintenance, such as oil changes, spark plug replacements, and cooling system checks, can significantly prolong the engine's lifespan.

3. Inspect the engine for signs of wear and tear. Check for corrosion, oil leaks, or any other visible issues that may indicate potential breakdowns.

Considering these factors, a 1987 205 cubic inch V6 Mercruiser 4.3 engine with 575 hours on it does not necessarily have too many hours with potential breakdowns in the near future, as long as it has been well-maintained and shows no major signs of wear and tear.

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Answer:

Newton's law of gravitation states that every object in this universe attracts every other object with a force called gravity,

when the distance between the two object is increased the gravitational force decreases by its square,

and when the mass an object increases the gravitational force also increases,

therefore, gravitational force is directly proportional to the mass of the two objects and is square inversely proportional to distance between them.

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