how do scientists determine the composition and temperature of stars?

The scientific unit named for Sir Isaac Newton measures force.

The scientific unit named after Sir Isaac Newton is the newton (N), and it is used to measure force. Force is a fundamental concept in physics that describes the interaction between objects and their ability to cause acceleration or deformation.

The newton is defined as the amount of force required to accelerate a one-kilogram mass at a rate of one meter per second squared (1 N = 1 kg·m/s²). It represents the strength or magnitude of a force and is widely used in various fields, including mechanics, engineering, and everyday life.

Whether it's the force exerted by gravity, the push or pull of objects, or the tension in a spring, the newton provides a quantitative measure for these physical interactions.

The newton is the unit of measurement for force in the International System of Units (SI). It is named after Sir Isaac Newton, a renowned physicist and mathematician who made significant contributions to the understanding of classical mechanics and the laws of motion.

Newton's second law of motion, F = ma (force equals mass times acceleration), is a foundational equation in physics and relates force to the mass and acceleration of an object.

The newton is defined based on this relationship and is used to quantify the effect of forces on objects. Understanding the newton and its application in measuring force is essential in various scientific and engineering disciplines.

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Answer: -31039 J

Explanation:

In this given circuit, there are two resistors, R2 and R3 connected in series with a battery of 12 V as shown below;\(\Delta V = V = 12 V\)Let us first find the total resistance of the circuit.

Using the formula, resistances in series add up to give the total resistance of the circuit\(R_T = R_2 + R_3 = 8\ \Omega + 12\ \Omega = 20\ \Omega\)

Using Ohm's Law; the current through the circuit can be calculated as follows;

\(I_T = \frac{V}{R_T} = \frac{12\ V}{20\ \Omega} = 0.6\ A\)

Thus, the current through each of the resistors, R2 and R3 is the same and it is equal to the total current of the circuit;\(I_1 = I_2 = 0.6\ A\)

The potential difference across each of the two resistors, R2 and R3 is different because of the difference in resistance. Using Ohm's Law, the potential difference across each resistor can be calculated as follows;

\(\Delta V_2 = V_{R_2} = I_2 \cdot R_2 = 0.6\ A \cdot 8\ \Omega = 4.8\ V\)

\(\Delta V_3 = V_{R_3} = I_2 \cdot R_3 = 0.6\ A \cdot 12\ \Omega = 7.2\ V\)

Thus, the potential difference across resistor R2 is 4.8 V and across resistor R3 is 7.2 V.

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Explanation:

a) What is the weight of the crate?

W = m*g = 60 kg *9.81 m/s^2 = 588.6 N

Sum of the forces in the vertical direction on the box (up is +) = F - W = 500 N - 588.6 N = -88.6 N

Since the forces do not add up to 0, then there is a net force on the crate which will cause the crate to accelerate.

b) F = m*a ==> a = F/m

a = -88.6 N / 60 kg = -1.48 m/s^2 (- means down since above we declared up as +)

c) Assume it starts from rest, vi = 0 m/s

Equation of motion in the vertical direction

h = h0 + v0*t + 1/2*a*t^2

h0 = 1.4 m

h = 0 m

v0 = 0 m/s

a = -1.48 m/s^2

0 = 1.4 m + 0 - 1/2* 1.48 m/s^2 * t^2

1.4 m = 1/2 * 1.48 m/s^2 * t^2

t = 1.38 s

d) vf = vi + a*t

vi = 0 m/s

vf = a*t = -1.48 m/s^2 * 1.38 s = -2.04 m/s

William Herschel thought he had found a comet when he spotted the green disk of Uranus.

Uranus is the seventh planet located far away from the Sun. It is a gaseous planet which was discovered in 1781, mistaken by a comet but after two years it was accepted as a planet. After decades of observations and only one close visit by a spacecraft, which shows us that Uranus has unique atmosphere.

Atmosphere of Uranus is mostly made up of hydrogen and helium as well as a small amount of methane and traces of water and ammonia. The presence of methane gas gives blue colour to Uranus so we can conclude that Uranus is the planet which was thought first a comet by William Herschel.

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The sound of solar eruptions cannot be heard on earth, because they cannot travel through space, as there is no medium.

The colliding, crossing, or reorganisation of magnetic field lines close to sunspots results in solar eruptions, which are rapid explosions of energy.

It is very dense on the Sun's surface. It contains electrically charged gases, which produce magnetic fields with strong magnetic forces in certain regions.

As there is no physical medium in space, where the sound of explosions is meant to travel. However, we are aware that sound cannot travel in a vacuum and needs a medium for propagation.

As a result, we cannot hear the explosions that are taking place in the Sun.

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Your question was incomplete, but most probably your question would be:

The Sun constantly undergoes explosions called solar eruptions. When a solar eruption happens, satellites capture images of bright flashes of light called solar flares. Solar eruptions emit more energy than millions of megaton hydrogen bombs. Space is a vacuum and void of any matter. Write a scientific explanation on why we don't hear solar eruptions on Earth.

Answer:

Gamma rays occupy the short-wavelength end of the spectrum; they can have wavelengths smaller than the nucleus of an atom. Visible light wavesare one-thousandths the width of human hair--about a million times longer than gamma rays. Radio waves, at the long-wavelength end of the spectrum, can be many meters long.

Answer:D "the frequency of gamma rays is greater."

Explanation:Trust

Answer:

electromagnetic radiation

Explanation:

The student notices that the electronic balance has a zero error, so it shows mass readings that are all slightly too small. This means that the density value is incorrect and slightly too small. The correct option is B.

The density is the ratio of the mass and the volume of the object. It is denoted by ρ.

ρ = mass/Volume = m/V

The student notices that the electronic balance has a zero error, so it shows mass readings that are all slightly too small.

As mass is directly proportional to density. The density will also be slight small when mass reading are all slightly small.

Thus, the correct option is B.

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Answer:

65

Explanation:

because everyday my birthday

(a). The object distance (do) is essentially at infinity, the image formed on the slide film is at the focal point of the lens, which means the diameter of the moon's image on the slide film will be equal to the diameter of the lens. Thus, the diameter of the moon's image on the slide film is 53.0 mm.

(b). The diameter of the moon's image on the screen is approximately 44.92 mm.

To solve this problem, we can use the thin lens formula:

1/f = 1/di + 1/do,

where f is the focal length of the lens, di is the image distance, and do is the object distance.

(a) Finding the diameter of the moon's image on the slide film:

Given:

Focal length of the lens (f) = 53.0 mm = 0.053 m

Object distance (do) = Mean distance from the Earth to the Moon = 3.85 × \(10^8\) m

Since the camera forms a real image on the slide film, the image distance (di) is equal to the focal length of the lens (f). Therefore, di = f.

Using the thin lens formula, we can solve for the object distance (do):

1/f = 1/di + 1/do

1/0.053 = 1/0.053 + 1/do

1/do = 1/0.053 - 1/0.053

1/do = 0

do = infinity

(b) Finding the diameter of the moon's image on the screen:

Given:

Focal length of the projector lens (f) = 103.4 mm = 0.1034 m

Image distance (di) = Distance from the lens to the screen = 16.1 m

Using the thin lens formula, we can solve for the object distance (do):

1/f = 1/di + 1/do

1/0.1034 = 1/16.1 + 1/do

1/do = 1/0.1034 - 1/16.1

1/do = 0.0096704 - 0.0621118

1/do = -0.0524414

do = -1/0.0524414 ≈ -19.07 m

Since the object distance (do) is negative, it means the object (moon's image) is located on the same side as the lens. In this case, the diameter of the moon's image on the screen will be given by the formula:

diameter = (di/do) × diameter of the moon's image on the slide film

Plugging in the values:

diameter = (16.1 m) / (-19.07 m) × 53.0 mm

diameter = -0.845 × 53.0 mm

diameter ≈ -44.92 mm

The negative sign indicates an inverted image. However, the magnitude of the diameter is what matters, so the diameter of the moon's image on the screen is approximately 44.92 mm.

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The elastic potential energy stored in the compressed spring is determined as 11.6 J.

The elastic potential energy of the spring is the energy stored in the spring and the magnitude is calculated as follows;

U = ( ¹/₂kx² )

where;

The given parameters include the following;

the spring constant, k = 580 N/m

the extension of the spring, x = 0.2 m

Substitute the given parameters and solve for the elastic potential energy stored in the spring based on the compression produced by the two blocks.

U = ( ¹/₂kx² )

U = ( ¹/₂ ( 580 N/m ) ( 0.2 m )² )

U = 11.6 J

Thus, the elastic potential energy stored in the compressed spring is a function of the spring constant and extension of the spring.

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the bus traveled from all the way back to  in 0.15 hrs then

is the bus's displacement-

Displacement of bus is 3 miles.

Given that

To find

So according the question

We have

                       u = 30 mile/hour.

                      t₁ = 0.1 hour.

                      t₂ = 0.15 hour.

Now, We have to find the total distance travelled by bus

We know that,

         \(velocity = \frac{distance}{time}\)

So,

             \(u = \frac{distance}{t_1}\)

              \(distance d = {u}\times {t_1}\)

              d = 30 × 0.1

              d = 3 miles

The total distance from oprfhs to phs is 3 miles.

This bus firstly travels from oprfhs to phs and come back from phs to oprfhs so the distance travelled by bus will be same i.e 3 miles.

Now, we can say that when bus traveled from phs all the way back to oprfhs in 0.15 hrs then the displacement of the bus is 3 miles.

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Answer:

erosion

Explanation:

because i just got it right on study island

I think least electricity is used between probably 7-8a.m. and 4-5p.m.

This is because, around those times, the suns already out. Depending on how sunny it is, it may not be as cold as all the other times of the day. And by then, buildings are typically already warmed all up. Everybody's body heat also may play a factor in buildings. ( if there is a ton of people )

Since cost = 0 €, the value of sinθ will be 1.  Recall that the Pythagorean identity for sine and cosine states that sin²θ + cos²θ = 1. So, sin²θ = 1 - cos²θ. Given cost=0 €,cosθ=0. Substituting cosθ = 0, we get;sin²θ = 1 - cos²θ.  sin²θ = 1 - 0² = 1Therefore,sinθ = √1 = 1  

This means that sin28 = 1  Since sin20 lies in the first quadrant (0° to 90°), it will have a positive value. To determine sin20, we can use a calculator or reference a trigonometric table. To the nearest tenth of a degree, sin20 is 0.3 and it lies in the first quadrant.

An identity that expresses the Pythagorean theorem in terms of trigonometric functions is known as the Pythagorean trigonometric identity, or simply the Pythagorean identity. It is one of the fundamental relations between the sine and cosine functions, along with the sum-of-angles formulas. The angle can be any real value, and the equation is s i n 2 + c o s 2 = 1. Given both the sine value and the quadrant in which the angle is located, we can use the Pythagorean identity to determine the angle of cosine.

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Answer:

A

Explanation:

Answer: B) unbalanced forces

Explanation:

        500 N and 600 N are not equal to each other. The two people are also pulling on the chain in opposite directions. Using these given pieces of information, we can decide that the answer is unbalanced forces acting upon the chain.

                 500 N ≠ 600 N

The given series, 1 + 7n Σ 57 n = 1, is divergent because the terms in the series continue to increase without bounds, the sum of the series also increases indefinitely.

To determine the convergence or divergence of the series, we can analyze its behaviour as n approaches infinity. The series can be written as Σ(1 + 7n*57) for n = 1 to infinity. By simplifying the expression, we have Σ(399n + 1) for n = 1 to infinity.

As n increases, the summand of the series grows linearly with a coefficient of 399. Since the coefficient is nonzero and positive, the series will diverge. This means that the sum of the series will not approach a finite value as n tends to infinity.

Therefore, the given series is divergent, and we cannot find its sum. It is important to note that a divergent series does not have a finite sum. Therefore, the sum of the given series is "DIVERGES."

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The switch that adjusts the magnetic field to be either nearly uniform or have a strong gradient will affect the current in the two coils differently.

When the magnetic field is nearly uniform at the center, the current in both coils will remain relatively unchanged. The uniform field will not induce any significant voltage in the coils, so the current will flow through them as usual.

However, when the magnetic field has a strong gradient, the current in the two coils will be affected differently. The rapidly changing field will induce a voltage in the coils according to Faraday's law of electromagnetic induction. This induced voltage will result in a change in the current flowing through the coils. The magnitude and direction of the induced current will depend on the specific characteristics of the coils and the magnetic field gradient.

In summary, the switch that changes the magnetic field from uniform to having a strong gradient will induce a change in the current flowing through the coils due to the induced voltage.

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Overall, a p-wave increases in velocity with depth. This implies that the density and/or rigidity of the material that the p-wave is passing through is increasing with depth.

This is because p-waves are compressional waves that propagate through the solid material of the Earth, and the speed at which they travel is influenced by the density and rigidity of that material. As the density and/or rigidity increase with depth, the p-wave encounters a greater resistance and travels at a faster velocity.

This is important for geophysicists who use seismic data to determine the structure and composition of the Earth's interior, as they can use the velocity of p-waves to infer properties of the materials they are passing through. Overall, the increasing velocity of p-waves with depth provides valuable information about the Earth's internal structure.

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The tangential speed of a point on the Ferris wheel is approximately 2.01 m/s.  the magnitude of the centripetal acceleration of a point on the Ferris wheel is approximately 0.106 m/s².

The tangential speed of a point on the Ferris wheel is given by the formula:

v = (2πr) / T

where v is the tangential speed, r is the radius of the Ferris wheel (half the diameter), and T is the time taken to complete one revolution.

In this case, the diameter of the Ferris wheel is 76 m, so its radius is 38 m. It completes one revolution every 20 min, so the time taken is T = 20 min = 1200 s. Substituting these values in the formula, we get:

v = (2π × 38 m) / 1200 s

≈ 2.01 m/s

The centripetal acceleration of a point on the Ferris wheel is given by the formula:

a = v² / r

where a is the magnitude of the centripetal acceleration, v is the tangential speed, and r is the radius of the Ferris wheel.

In this case, we have already calculated the tangential speed to be approximately 2.01 m/s, and the radius of the Ferris wheel is 38 m. Substituting these values in the formula, we get:

a = (2.01 m/s)² / 38 m

≈ 0.106 m/s²

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Answer:

C) circling above earth

Answer:

10 J

Explanation:

work = force x distance

work = 5x2

work = 10 J

Joule is the unit for work

What help do you want? If you tell, I may help you.

The magnitude of the gravitational force between the planet and the satellite, F = G * (M * m) / R².

The magnitude of the centripetal acceleration of the satellite, ac = v² / R

The magnitude of the gravitational force F between the planet and the satellite is given by the formula:

where;

b) The magnitude of the centripetal acceleration ac of the satellite is given by the formula:

ac = v² / R

where v is the speed of the satellite.

c) We can equate the gravitational force to the centripetal force, which gives:

G * (M * m) / R² = m * v² / R

Solving for v, we get:

v = √(G * M / R)

d) Substituting the given values, we get:

v = √((6.6743 × 10⁻¹¹ Nm²/kg²) * (1.6 × 10²⁴ kg) / (2.1 × 10⁷ m))

v ≈ 2.41 × 10³ m/s

Therefore, the speed of the satellite is approximately 2.41 × 10^3 m/s.

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