Why is the Earth’s core so hot? How do Scientists measure its temperature?

Explanation:

answer is the 3rd law of motion

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All of the above options could potentially from a thermostatic valve's thermal bulb coming loose from suction line at the outlet of evaporator.

When the bulb is disconnected, the pressure inside it may increase, causing the thermostatic expansion valve to open. This can lead to a decrease in superheat in the evaporator as more refrigerant is allowed to flow through the valve. Additionally, the increase in refrigerant flow can cause an increase in evaporating pressure and the compressor's suction pressure. Therefore, all of the mentioned consequences are possible outcomes of a loose thermal bulb in a thermostatic expansion valve.

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Answer:

Um, wrong.

Explanation:

The Helioentric model is correct. We orbit the sun. The GEOcentric model is incorrect. The Universe does not orbit the Earth. What are you learning?

The plane travels a distance of 325 miles if the airplane travels for 2.5 hours at an average speed of 130 miles per hour. Using the distance formula (d = rt), we can calculate the distance.

To find the distance traveled by the airplane, we can use the distance formula, which is represented as d = rt. In this formula, "d" represents the distance, "r" represents the rate or speed at which the object is traveling, and "t" represents the time taken for the travel.

Given that the airplane travels for 2.5 hours at an average rate of 130 miles per hour, we can substitute these values into the formula. The rate of the airplane is 130 miles per hour, and the time taken is 2.5 hours.

Using the formula, we can calculate the distance traveled as follows:

d = rt

d = 130 mph × 2.5 hours

Multiplying the rate (130 mph) by the time (2.5 hours) gives us:

d = 325 miles

Therefore, the airplane travels a distance of 325 miles during the 2.5 hours of travel at an average rate of 130 miles per hour.

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Answer: An atom's emission of light with a specific amount of energy confirms that atoms must have a dense central mass surrounded by electrons at a distance

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Answer:

It's B, electrons emit and absorb energy based on their position around the nucleus.

Answer:

ADD ALL THEM AND ANSER WILL BE THERE 19.O

Explanatio

Therefore, the angle between vectors `u` and `v` is 90°.

To find the angle between two vectors, we can use the formula:

`cos(θ) = (u . v) / (||u|| ||v||)`

Where u and v are vectors, `.` is the dot product of vectors and || || is the magnitude of a vector.θ is the angle between the two vectors.

In this problem, we need to find the angle between vectors `u` and `v`.

We have the following vector

s:u = (2, 3, 0) and v = (3, −2, 1)

Let's find the dot product of vectors `u` and `v`.u .

v = 2 × 3 + 3 × (−2) + 0 × 1

= 6 − 6 + 0

= 0

Let's now find the magnitudes of vectors `u` and `v`.||u|| = √(2² + 3² + 0²) = √(13) and

||v|| = √(3² + (−2)² + 1²)

= √(14)

Now, we can use the formula to find the angle between vectors `u` and `v`.cos(θ) = (u . v) / (||u|| ||v||)cos(θ)

= 0 / (√(13) × √(14))cos(θ)

= 0θ

= cos⁻¹(0)θ

= 90°

The angle between the vectors u = (2, 3, 0) and v = (3, −2, 1) is 90 degrees.

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Answer:

electrical- mechanical

Explanation:

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Answer:

20 degrees.

Explanation:

From Snell’s law of refraction:

sinθ1•n1 = sinθ2•n2

where θ1 is the incidence angle, θ2 is the refraction angle, n1 is the refraction index of light in medium1, and n2 is the refraction index for virgin olive oil. The incidence angle of the red light is θ1 = 30 degrees.

The red light is in air as medium1, so n1 (air) = 1.00029

So, to find θ2, the refracted angle:

sinθ1•1.00029 = sinθ2•1.464

sin(30)•1.00029 / 1.464 = sinθ2

0.5•1.00029 / 1.464 = sinθ2

sinθ2 = 0.3416291

θ2 = arcsin(0.3416291)

θ2 = 19.976 degrees

To the nearest degree,

θ2 = 20 degrees.

Using the Standard population for region, the proportionate mortality for old people in region Y is 80%. The correct answer is option  (c).

To calculate the proportionate mortality, we need to determine the number of deaths among old people in region Y and divide it by the standard population for region Y.

According to the given options, option c is the correct answer, which states that the proportionate mortality is 48/60 = 80%.

This means that out of the standard population of 60 in region Y, 48 deaths occurred among old people. This indicates a high proportionate mortality rate for the elderly population in region Y, reflecting the impact on that age group's mortality in the region.

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Answer:

Oganesson

Oganesson has the highest atomic number and highest atomic mass of all known elements. The radioactive oganesson atom is very unstable, and since 2005, only five (possibly six) atoms of the isotope 294Og have been detected.

Explanation:

One key difference between living on earth and in space is the effect of gravity on the human body. On earth, gravity provides a constant force that keeps our bones and muscles strong. In space, however, gravity is much weaker and astronauts experience weightlessness. This can lead to various health problems, such as bone loss, muscle atrophy, and fluid shifts. Therefore, astronauts need to exercise regularly and follow a balanced diet to maintain their physical and mental well-being.

Gravity is a natural phenomenon whereby everything that has mass or energy in the universe—including planets, stars, galaxies, and even light—attracts one another.

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Answer:

Transformers use “electrical steel” alloys. ... From 1% to 6.5% silicon is added, as well as a small amount (up to 0.5%) of manganese and aluminum to reduce brittleness in alloys with higher percentages of silicon. Electrical steels are formulated and processed to have low hysteresis and eddy-current losses.

Explanation:

The eddy currents consume energy and heat the iron core. The designers of the electrical machines and transformers laminate the core with thin sheets of iron coated with a thin oxide layer.

To reduce Eddy current loss in the transformer, the iron core is constructed of laminated silicon steel and has a unique insulated coating.

Instead of employing a solid iron block, this can be accomplished by laminating the core, which is constructed from a collection of metal plates that are adhered together.

With less current flow, efficiency loss, and heat waste, this has the desired effect of raising electrical resistance inside the core. Low hysteresis and eddy-current losses are achieved by the formulation and processing of electrical steels.

The iron core is heated by the eddy currents, which use energy. The core of electrical devices and transformers is laminated with thin sheets of iron covered in a thin oxide layer by the designers.

Therefore, Transformers use alloys known as “electrical steel.” To lessen brittleness in alloys with larger percentages of silicon, between 1% and 6.5% silicon is added, along with a tiny amount (up to 0.5%) of manganese and aluminum.

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KE inc. PE dec.

Explanation:

If she is accelerating down she is moving faster and faster, so the velocity in 0.5mv^2, is inc.

By conservation of energy alone this means PE is dec.

This makes sense due to her having less distance to fall, thus less PE, since PE=mgh in simple cases.

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The characteristics can be categorized as follows: Only ordinary thunderstorms: Produces straight-line winds, Produces heavy rains, Squall line thunderstorms: Produces straight-line winds, Supercell thunderstorms: Produces heavy rains

What is Squall line thunderstorms?

A squall line thunderstorm, often referred to simply as a squall line, is a type of severe thunderstorm system characterized by a long line or band of storms that extends over a considerable distance. Squall lines are commonly associated with strong winds, heavy rainfall, lightning, and sometimes tornadoes.

Ordinary thunderstorms can produce straight-line winds, strong or gusty winds, and heavy rains, but they are not specifically associated with tornado formation or distinct radar signatures.

Squall line thunderstorms share similar characteristics with ordinary thunderstorms but are also associated with small, distinct radar signatures.

Supercell thunderstorms possess all the characteristics of ordinary and squall line thunderstorms, including straight-line winds, strong or gusty winds, heavy rains, and often tornado formation. Additionally, supercells are characterized by long, linear radar signatures.

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The car will have traveled through an angle of approximately 119.7 degrees when the magnitude of its total acceleration is 2.6 m/s^2.

What is the angle of approximate calculation?

The magnitude of the total acceleration of a car on a curved path can be given by:

a = √(at^2 + ac^2)

where at is the tangential acceleration (1.3 m/s^2), and ac is the centripetal acceleration, which is given by:

ac = v^2 / r

where v is the velocity of the car and r is the radius of the curve (130 m).

Setting a = 2.6 m/s^2, we can solve for v:

v = √(r * a^2 - at^2) = √(130 * 2.6^2 - 1.3^2) = 27.47 m/s

The angle through which the car will have traveled can be found using the equation for the arc length s:

s = r * θ

where θ is the angle in radians. Substituting the values for v and t into the equation for s, we can solve for θ:

θ = s / r = v * t / r

Since the car started from rest, t can be found from the equation for acceleration:

at = v / t

t = v / at = 27.47 / 1.3 = 21.06 s

Finally, substituting t into the equation for θ, we get:

θ = v * t / r = 27.47 * 21.06 / 130 = 2.07 radians = 119.7 degrees

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.

The wavelength of light changes. However, since the velocity of light is much greater than the velocity of the car, the change in wavelength is insignificant and cannot be detected by the human eye. This is why we do not notice the Doppler shift for light when a car with its lights on goes past.

Doppler shift is a change in the observed frequency of a wave (such as sound or light) when the source of the wave is moving relative to an observer. When a car goes past with its radio blaring, we easily hear the Doppler shift for sound as the car passes (the sound appears to shift from a pitch that is too high to one that is too low).

However, if a car goes past with its lights on, we do not notice the Doppler shift for light (the color does not seem to shift towards the red frequencies). This is so because the velocity of light is much higher than the velocity of sound. The Doppler shift formula for light is given by:

(Δλ/λ) = v/c

where,Δλ is the change in wavelengthλ is the original wavelength of light v is the velocity of the sourceS is the velocity of light When a car with its lights on is moving towards you, the light waves are compressed in front of the car and stretched behind the car. Therefore, the wavelength of light changes. However, since the velocity of light is much greater than the velocity of the car, the change in wavelength is insignificant and cannot be detected by the human eye.

This is why we do not notice the Doppler shift for light when a car with its lights on goes past.

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To find the spherical convex mirror radius, learn the focal length and magnitude.

What is focal length?

The focal length of a thin lens in air is measured from the lens's center to its primary foci, also known as focal points. The focal length of a converging lens, such as a convex lens, is positive and determines how far a collimated light beam must travel to focus on a single point.

What is magnitude?

Magnitude typically refers to size or distance. By comparing the size and motion speed of the object, we can relate magnitude to movement. The object's or quantity's size determines its magnitude.

R=0.123m

Focal length E= R/2

E= - 0.0615m.

Therefore, the focal length is 0.0615m.

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Answer:

Explanation:

The volume of the chess can be found by using the formula

volume = final volume of water - initial volume of water

From the question

final volume of water = 43 mL

initial volume of water = 35 mL

We have

volume = 43ml - 35ml = 8 mL

We have the final answer as

Hope this helps you

Answer:

See below

Explanation:

Assuming no resistance

DISTANCE =  1/2 a t^2

443 = 1/2 (9.81)t^2      Shows t = 9.5 seconds

The proper order of structures through which light must pass in order to perceive and image is cornea, aqueous humor, lens, vitreous humor, retina.

These are the five main structures of the human eye that enable vision, including light perception and imaging. Let's delve into each of these structures.

Cornea: The clear, protective outer layer of the eye is the cornea. The cornea has two purposes: to shield the inner eye from harm and to help focus light on the retina at the back of the eye.

The cornea's curved shape bends light waves as they enter the eye, assisting in their concentration.

Aqueous humor: This is a liquid that flows throughout the front of the eye, nourishing and removing waste from its surrounding tissues.

It aids in the maintenance of normal eye pressure, and if this pressure becomes too high, it can lead to glaucoma.

Lens: The lens' job is to concentrate light onto the retina. It's a transparent structure with a biconvex (lens-like) shape that varies in thickness.

It is supported by ciliary muscles that allow it to alter shape when we focus on things at different distances.

Vitreous humor: This gel-like substance fills the eye's posterior (rear) cavity, providing it with structural stability and helping it to maintain its form. It also assists in light refraction.

Retina: This is a thin layer of tissue lining the rear of the eye. The retina's photoreceptor cells, or rods and cones, are sensitive to light.

The retina converts light energy into neural signals that are transmitted to the brain via the optic nerve, which is located behind the eye. The brain translates these signals into images, allowing us to see.

What we see when we open our eyes is formed by light. In order to perceive an image, light must pass through a series of structures in the eye.

The cornea, aqueous humor, lens, vitreous humor, and retina are the five main structures of the human eye that enable vision, including light perception and imaging.

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Explanation:

Given parameters:

Mass of forklift  = 750kg

Height of lift  = 18m

Time taken  = 28s

Unknown:

Work done = ?

Power = ?

Solution;

 The work done by the forklift is given as:

  Work done = mass x acceleration due to gravity x height

   Work done  = 750 x 9.8 x 18  = 132300J

Power is the rate at which work is done;

      Power  = \(\frac{work done }{time}\)  

 Insert the parameters and solve;

    Power  = \(\frac{132300}{28}\)  = 4725W

The three forces that you exert while riding a bicycle would be the gravitational force, frictional force, and the resistance force of the air.

Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.

As given in the problem we have to list the three forces that you exert when riding a bicycle.​

Thus, three forces that you exert while riding a bicycle would be the gravitational force, frictional force, and the resistance force of the air.

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Answer:

It depends on the ratio of nuetrons to protons

Answer:

\(\boxed {\boxed {\sf v_i= 4 \ m/s}}\)

Explanation:

We are asked to find the cyclist's initial velocity. We are given the acceleration, final velocity, and time, so we will use the following kinematic equation.

\(v_f= v_i + at\)

The cyclist is acceleration at 1.2 meters per second squared. After 10 seconds, the velocity is 16 meters per second.

Substitute the values into the formula.

\(16 \ m/s = v_i + (1.2 \ m/s^2)(10 \ s)\)

Multiply.

\(16 \ m/s = v_i + (1.2 \ m/s^2 * 10 \ s)\)

\(16 \ m/s = v_i + 12 \ m/s\)

We are solving for the initial velocity, so we must isolate the variable \(v_i\). Subtract 12 meters per second from both sides of the equation.

\(16 \ m/s - 12 \ m/s = v_i + 12 \ m/s -12 \ m/s\)

\(4 \ m/s = v_i\)

The cyclist's initial velocity is 4 meters per second.

Answer:

4.1 Introduction. Our modern society depends heavily on thermal energy sources derived mostly from coal, petroleum, and natural gas combustion.

The graph of the planet's gravitational potential energy as it completes one orbit would be in the shape of a curve, with the highest point corresponding to the farthest distance from the center of the gravitational field and the lowest point corresponding to the closest distance.

The gravitational potential energy of a planet is directly related to its distance from the center of the gravitational field. As the planet moves closer to the center, its gravitational potential energy decreases, and as it moves farther away, the potential energy increases. Therefore, the graph would show a curve that starts at a maximum point when the planet is at its farthest distance from the gravitational source (e.g., the Sun), and gradually decreases as the planet moves closer during its orbit.

At the point closest to the gravitational source, the graph would reach its minimum value, representing the lowest gravitational potential energy. This occurs when the planet is at its perihelion (closest point to the Sun) in the case of a solar system orbit. From there, the graph would again rise as the planet moves away from the gravitational source and reaches its maximum potential energy at the farthest point of the orbit, known as the aphelion.

The specific shape of the graph will depend on the eccentricity of the planet's orbit. For a circular orbit, the graph would form a symmetrical curve, whereas for an elliptical orbit, the curve would be elongated and asymmetrical.

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The frequency of the travelling wave is found to be 20 Hertz.

The relationship between the frequency of the wave, the wavelength of the wave and the speed of the wave is given by

V = fy

Where,

V is the speed of the travelling wave,

F is the frequency of the travelling wave,

y is the wavelength of the travelling wave.

The speed of the travelling wave is given to be 500m/s and the wavelength of the travelling wave is 25m.

Now, putting all the values,

500 = f(25)

f = 500/25

f = 20Hz

So, the frequency of the travelling wave is 20Hz.

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Empty beer can: mass 50g, length 12cm, radius 3.3cm. Moment of inertia found by subtracting mass of lid/bottom from mass of empty can, and using I=(1/2)mr² for a solid cylinder. Result: 1.7 x 10^-5 kg m².

An empty beer can has a mass of 50 g, a length of 12 cm, and a radius of 3.3 cm. Assume that the shell of the can is a perfect cylinder of uniform density and thickness. To find the moment of inertia of the can about the cylinder's axis of symmetry-

(a) Let the mass of the lid/bottom be m. The mass of the empty can is 50g.

Since the lid and bottom are identical in shape and mass, we can write that the total mass of the can is 2m + 50g.

Thus, the mass of the lid/bottom is m = (50g)/2 = 25g.

Therefore, the mass of the lid/bottom is 25g.

(b) The mass of the shell is the mass of the empty can minus the mass of the lid/bottom.

Therefore, the mass of the shell is

\(m_{shell} = m_{empty} - m_{lid/bottom} = 50g - 25g = 25g.\)

(c) Moment of inertia of a solid cylinder of radius r and mass m about the axis of symmetry is given by

I = (1/2)mr²

The radius of the can is r = 3.3 cm = 0.033 m.

The length of the can is not needed to find the moment of inertia of the can about its axis of symmetry since the moment of inertia is independent of the length of the cylinder (as long as its mass and radius remain the same).

The mass of the shell is m_shell = 25g = 0.025 kg.

Using the formula for moment of inertia, we get

\(I = (1/2)mr² = (1/2)(0.025 kg)(0.033 m)² = 1.7 x 10^-5 kg m²\)

Therefore, the moment of inertia of the can about its axis of symmetry is 1.7 x 10^-5 kg m².

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