Describe at least four techniques used by astronomers to determine distances to stars and galaxies. Make sure you include the scientific theory behind each method and the range over which each method is considered valid.

Explanation:

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The resultant force of the three professional wrestlers on the championship belt is 98.35 N.

The component of the forces in x -direction is calculated as follows;

Fx = 40 N  +  60(cos 36.9)

Fx = 40 N + 47.98 N

Fx = 87.98 N

The component of the forces in y -direction is calculated as follows;

Fy = -80 N + 60(sin 36.9)

Fy = -43.95 N

R = √Fx² + Fy²

R = √( 87.98²  + 43.95²)

R = 98.35 N

Thus, the resultant force of the three professional wrestlers on the championship belt is 98.35 N.

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The most appropriate conditions that matches Gas cloud 1 include the following:

The most appropriate conditions that matches Gas cloud 2 include the following:

A star can be defined as a giant astronomical object that contains a luminous sphere of plasma and two (2) main hot gases (hydrogen and helium), and it is bounded together by its own gravitational force.

Since Gas cloud 1 is likely to form a star, the most appropriate conditions that matches it include the following:

Since Gas cloud 2 is not likely to form a star, the most appropriate conditions that matches it include the following:

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Explanation:

Distance traveled by motorist =(15.0m/s)t

Distance traveled by policeman =1/2(2.00m/s2)t2

(a) Intercept occurs when 15.0t =t2or t=15.0s.

(b) x(officer)=1/2(2.00m/s2)t2= 225m

Hi there!

Drum #2 will have a greater center of mass speed and reach the bottom of the hill first.

The moment of inertia can be thought of as inertia for rotation.

If mass is concentrated at the rim, the drum has a GREATER moment of inertia compared to if the mass is more concentrated towards the center.

Using the Rotational Equivalent of Newton's Second Law:
[tex]\Sigma \tau = I\alpha[/tex]

**Sum of torques = Moment of inertia * angular acceleration

From this equation, we know that if 'I' increases, 'α' decreases, and thus, the speed of the object's center of mass decreases and it will reach the bottom later.

Therefore, drum #2 with the smaller moment of inertia (mass concentrated at the center) will have a greater angular acceleration ⇒ greater center of mass speed ⇒ read the bottom first.

A thin-walled hollow sphere has a radius of 4 cm from the center

of the sphere, the electric field points radially inward and

has a magnitude of 1.5 × 10⁴ N/C then the charge on the surface would be 2.6690×10⁻⁹ C

Charged material experiences a force when it is exposed to an electromagnetic field due to the physical property of electric charge. You can have a positive or negative electric charge.

The electric field inside a spherical shell is given by the formula

E = q/4πεr²

where q is the charge on the surface

r is the radius of the sphere

ε is the electrical permeability

By substituting the respective values in the given formula

1.5 × 10⁴ = q/4π(8.85✕ 10⁻⁻¹²)(.04²)

q = 2.6690×10⁻⁹ C

Thus, the charge on the surface would be2.6690×10⁻⁹ C

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It is important to be able to describe a system quantitatively because there exist many variables that show a continuous range of variation.

Quantitative research is any type of investigation based on scientific variables that express their values as a continuous range of variation.

For example, there are genetic traits such as height and weight that show quantitative variation, thereby they need to be expressed as ranges.

In conclusion, it is important to be able to describe a system quantitatively because there exist many variables that show a continuous range of variation.

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MAGNITUDE AND DIRECTION OF A VECTOR

Given a position vector →v=⟨a,b⟩,the magnitude is located by |v|=√a2+b2. The direction is equal to the angle formed with the x-axis, or with the y-axis, depending on the application. For a position vector, the direction is found by tanθ=(ba)⇒θ=tan−1(ba)

The formula to determine the extent of a vector (in two dimensional space) v = (x, y) is: |v| =√(x2 + y2). This formula is derived from the Pythagorean theorem. the procedure to determine the magnitude of a vector (in three dimensional space) V = (x, y, z) is: |V| = √(x2 + y2 + z2)

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main answer is given below,

For each of the given scenarios and based on the  volume, mass, and density of the spheres, the water level is given as follows:

Scenario 1: The water level will rise; r

Scenario 2: The water level may rise or fall; r or f

Scenario 3: The water level will fall; f

The density, volume and mass of an object are related by the formula below:

The rise in the level of fluid when an object is placed in that fluid depends on the weight, volume and density of that object.

This is given by Archimedes' principle which states that the upthrust acting on a body immersed fully or partially in a fluid, is equal to the weight of the fluid displaced.

Based on the above, the water level in each of the scenarios is described thus:

Scenario 1: The new sphere has a radius of r < r0 and a mass of m > m0.

The new has a smaller volume and a greater mass and density. The water level will rise.

Scenario 2: The new sphere has a mass of m > m0 and a density of ρ < ρ0.

The new sphere has a greater volume and will float. Therefore, the water level may rise or fall.

Scenario 3: The new sphere has a density of ρ < ρ0 and a radius of r > r0.

The new sphere has a greater volume but less mass. Therefore, the water level will fall.

In conclusion, the rise or fall of the water level in the container depends on the volume, mass, and density of the spheres.

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The summary of the step you might use to carry out an investigation using scientific method include:

This is defined as a systematic approach which helps to predict how several elements in the universe works.

This usually starts with observing a phenomenon and making a hypothesis. This is usually followed by conducting experiment to ascertain its authenticity before a conclusion is drawn.

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B. As the resistance increases, the slope on the current vs voltage graph gets flatter.

Resistance is the opposition to the follow of current in electrical material.

The mathematical relationship between resistance, current and voltage is given by Ohm's law.

R = V/I

where;

From the equation above, increase in resistance means an increase in voltage or decrease in current.

In Current vs voltage graph, the following will occur;

Thus, as the resistance increases, the slope on the current vs voltage graph gets flatter.

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Answers are:

a. The work done by the weight lifter W = 25000 Joule

b. The work done by the gravity W = 12250 Joule

c. The net work done on the object W = 12750 Joule

What is Work ?

Work is the product of force and distance in the direction of the force applied. That is, W = F x h

The S.I unit is Joule.

Given that a weight lifter lifts a mass of 250 kg with a force of 5000N to a height of 5m.

The given parameters are;

a. The work done by the weight lifter will be

W = F x h

W = 5000 x 5

W = 25000 Joule

b. The work done by the gravity will be

W = mg x h

W = 250 x 9.8 x 5

W = 12250 Joule

c. The net work done on the object will be

W = 25000 - 12250

W = 12750 Joule

Since the work done by the gravity is in opposite direction to the work done by the weight lifter, the net work done on the object will be the difference between the two.

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Answer:

960 N

Explanation:

answer should have two signif digits  

a = change in velocity divided by change in time

   1 m/s / .5 s =   2 m/s^2

F = ma      a = g + 2 m/s^2 = 9.81 + 2 =  11.81 m/s^2

  81 kg * 11.81 m/s^2   = 956.61   N = ~ 960 N  (two sig digits)

(Please let me know if this is incorrect....I am not SURE )

The gravitational acceleration on the board of the Deepsea Challenger when it is in the Mariana Trench, 11 km below the surface of the Pacific Ocean is very large due to the high pressure. That is option B

The gravitational acceleration is the acceleration of an object that is under free fall. The acceleration due to gravity is 9.81 m/s2. above the sea level.

One of the factors that affect gravitational acceleration is depth. This is because as the depth increases so will pressure increase.

Increase in pressure leads to increase in gravitational acceleration.

Therefore, the gravitational acceleration on the board of the Deepsea Challenger when it is in the Mariana Trench, 11 km below the surface of the Pacific Ocean is very large due to the high pressure.

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a 10 kg block reaches a point with a velocity of 15 m per second and slides down a rough track my the coefficient of the kinetic energy between the two surface ab and the block iis0.52

The new speed of car is 10.9 m/s

According to the principle of momentum conservation, momentum is only modified by the action of forces as they are outlined by Newton's equations of motion; momentum is never created nor destroyed inside a problem domain.

Mass of the railroad car, m₁ = 7950 kg

Mass of the load, m₂ = 2950 kg

It can be assumed as the speed of the car, u₁ = 15 m/s

Initially, it is at rest, u₂ = 0

Let v is the speed of the car. It can be calculated using the conservation of momentum as :

[tex]m_1u_1 + m_2u_2 = (m_1 + m_2) v[/tex]

[tex]v =\frac{m_1u_1}{m_1+m_2}[/tex]

[tex]v = \frac{7950*15}{7950+2950}[/tex]

[tex]v= 10.9 m/s[/tex]

Therefore, the new speed of care is 10.9 m/s

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Answer:[tex]\sqrt{65} m/s[/tex]

Explanation:

The minimum necessary height of the IV bag above the position of the needle is 0.37 m.

The minimum necessary height of the IV bag above the position of the needle is calculated as follows;

P = ρgh

where;

h = P/ρg

h = (4759.609) / (9.8 x 1308)

h = 0.37 m

Thus, the minimum necessary height of the IV bag above the position of the needle is 0.37 m.

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Answer: Both total and annular eclipses depend on the distances between Earth, the Moon, and the Sun. A total solar eclipse occurs when the Moon is closer to Earth, thus taking up a larger portion of the sky. The Moon is then able to cover the entire Sun.

Explanation: Edmentum answer

The hypothesis will be:

H₀ = The amount of salt added to ice will not affect the rate at which the ice will melt.

H₁ =  The amount of salt added to ice will affect the rate at which the ice will melt.

The independent variable which is can be changed by increasing the rate of salt added to the equation.

The dependent variable which is ice will change or melt in response as it will decrease if the rate of the salt added increases.

Salt does not really lower the temperature of an ice cubes, it is known to just lowers their freezing point, that is lowers their melting point.

Note that if salt is around, ice cubes are known to be colder to be solid, and they tend to melt at a temperature that is said to be lower than the freezing point of pure water.

If  the ionic compound salt is known to be added, it tends to lowers the freezing point of the water, which implies that the ice on the ground is not able to freeze that layer of water at all.

Therefore, The hypothesis will be:

H₀ = The amount of salt added to ice will not affect the rate at which the ice will melt.

H₁ =  The amount of salt added to ice will affect the rate at which the ice will melt.

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Answer:

1.74

Explanation:

"How do you calculate the mechanical advantage of a block and tackle pulley?

To calculate the mechanical advantage, we can either divide the weight of the object being lifted by the force required to lift it or we can divide the amount of rope we have to pull by the distance the object moves."

If we use the rope method the mech advantage is  33.0/16.5 = 2

  now if we use the forces   MA = 225/129 =1.74 <==== this is not equal to '2' as we first found due to energy being lost to friction/deformation of rope etc.              SO I would say the true mechanical advantage = 1.74  

Efficiency =  1.74/2 = 87%

Answer:

Andromeda galaxy is the correct answer.

Answer:the

8/9 h

Explanation:

Height  =   1/2 a T^2     now change to T/3

 now height = 1/2 a (T/3)^2   = 1/9  1/2 a T^2     <===== it is 1/9 of the way down   or   8/9 h

state, whether the table represents a relation function both or neither x y 4 -20 1 -17 4 -14 16 5 10 0 -19 -16 Reconstruction was successful in that it allowed the United States to once again function as a single country by 1877. The states' rights vs. federalism controversy, which had been a point of contention since the 1790s, was also eventually resolved during reconstruction.

By most other standards, reconstruction was a failure: radical Republican legislation eventually failed to shield former slaves from white persecution and to bring about significant alterations to the South's socioeconomic structure. The federalism question, which had been a topic since the 1790s practically immediately, was at hand when President Rutherford B. Former Confederate officials and slaves returned to the South after Hayes withdrew federal soldiers from the region in 1877. These newly powerful white southern legislators established anti-progressive laws like voter ID requirements and black codes with the help of a conservative Supreme Court in an effort to roll back the rights that blacks had won during Radical Reconstruction. With its rulings in the Slaughterhouse Cases, the Civil Rights Cases, and United States v., the U.S. Supreme Court strengthened this anti-progressive movement federalism.

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[tex] \qquad \qquad \bf \huge\star \: \: \large{ \underline{Answer} } \huge \: \: \star[/tex]

[tex]\textsf{ \underline{\underline{Explanation} }:}[/tex]

The given picture shows a dam, and as we know dam ises water current to produce electricity. as the water current has high kinetic energy, so when it hits and rotates the turbine, the generator produces electricity.

Hence, the correct option will be :

❖ D. Kinetic energy to electrical energy

The value of parameter B (angular frequency) for this function is 2.7.

The amplitude of a wave is the maximum displacement of the wave. It can also be described at the maximum upward displacement of a wave curve.

f(x) = Acos(Bx)

where;

Angular frequency is  the angular displacement of any element of the wave per unit time.

From the blue color; at y = -0.9, x = -7.5 cm

-0.9 = cos(-7.5B)

7.5B = arc cos (0.9)

7.5B = 2.7

B = 7.5/2.7

B = 2.7

Thus, the value of parameter B (angular frequency) for this function is 2.7.

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The oxygen–hemoglobin dissociation curve depicts the relationship between the partial pressure of oxygen (pao2) and the arterial oxygen.

The oxygen-hemoglobin dissociation curve (OHDC) indicates the relationship between the oxygen saturation of hemoglobin and the partial pressure of arterial oxygen. This curve can change its position or shifted to another level depending on various factors.

So we can conclude that the oxygen–hemoglobin dissociation curve depicts the relationship between the partial pressure of oxygen (pao2) and the arterial oxygen.

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Hi There. So the 'red shift' and the 'blue shift' are all apart of the Doppler shift. But they are polar opposites.

Question 1:

Red shift means the frequency and associated wavelength of visible light has shifted toward the red part of the spectrum of EM radiation, as opposed to blue shift which means the frequency and associated wavelength has shifted toward the blue part of the spectrum. Red shift is a lower frequency / longer wavelength, and blue shift is a higher frequency / shorter wavelength. You could be wondering what causes red shift, and there are a few reasons for it. One of the causes is relativistic motion, often known as the Doppler Effect, which was initially noticed with sound waves and moving observers and sources. The light looks redder as a source moves away from an observer (they move away from each other, regardless of which one is traveling with respect to some reference frame), and bluer as the two move closer to one another. The term gravitational red shift refers to another reason. As a photon (a quantum of EMR) moves away from the surface of a mass aggregation, such as a star, the intensity of the field's magnitude decreases by the square of the distance, and the photon accelerates. A photon experiences the reverse consequence as it passes through a g-field with a rising magnitude of pressure, but there is considerable disagreement over what happens to the little amount of kinetic energy obtained from the field. Gravitational red shift is then seen. EM in nature is another factor. The phosphor coating on the interior of the glass tube is struck by UV radiation that is emitted by the arc carried via the mercury vapor in fluorescent lamps. The UV photons' energy is absorbed by the phosphor coating, which subsequently emits heat and visible light. The transition from UV to visible light and heat is a classic red shift. The identical red shift phenomena is explained by three separate methods.

Question 2:

The displacement of the spectrum to shorter wavelengths in the light coming from distant celestial objects moving toward the observer. Ever notice the sound of a car or train is higher pitched when it's heading toward you, and becomes lower as it goes away? Light does the same thing. If you look at an object that's heading away from you quickly enough, it will appear more red than it actually is. If something is heading towards you, it will appear more blue. This becomes very useful for astronomers; if you know a certain object's composition, you can tell how fast it's moving by the color change.

Question 3:

The apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer is known as the "Doppler effect," and it is caused by the relative velocity of the wave source and the observer. This phenomena is used in astronomical observations, Mössbauer effect studies, radar, and modern navigation. The earliest description of it was published in 1842 by Austrian scientist Christian Doppler. The apparent pitch of a blowing horn is a fantastic illustration of the Doppler effect since it increases as you move closer to it before decreasing as you pass it. Similar to this, when a star is observed from Earth, its light shifts toward the violet end of the spectrum (higher frequency or shorter wavelength) when the star and Earth are getting closer and toward the red end of the spectrum (lower frequency or longer wavelength) when the star and Earth are getting farther apart. The Doppler effect is often used in contemporary models of the cosmos to study stellar motion and search for double stars. see redshift as well.

Question 4:

Blueshift is the name for an object's light while it is travelling toward us, and redshift is the name for an object's light when it is going away from us.

Thank you,

Eddie

It is to be noted that the magnitude of the electric flux through the hemisphere surface  is πR²E. (Option D)

The characteristic of an electric field known as electric flux may be thought of as the quantity of electric lines of force (or electric field lines) that cross a certain region.

According to this theory, electric field lines begin with positive electric charges and end with negative charges.

Recall  that the A hemispherical surface (half of a spherical surface) of radius R.

In order to derive the Magnitude of the electric flux we use the following formula:

Ф = ∈ x Area of the Curve Surface

⇒ Ф = ∈ x πR²

⇒ Ф = πR²∈

Thus, option D is the correct answer.

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Full Question:

A hemispherical surface (half of a spherical surface) of radius R is located in a uniform electric field of magnitude E that is parallel to the axis of the hemisphere. What is the magnitude of the electric flux through the hemisphere surface?

A) 2πR²∈

B) 0

C) 4 πR²∈/3

D) πR²∈

Answer:

23.562

Explanation:

First it is good to work out the circumference:

2 pi r

2 pi .75

circumference = 4.7124

Next we need half of this because it is half a resolution. This will be our distance travelled.

half = 2.3562

word done = force x distance

work done = 10 x 2.3562

work done = 23.562

(I didn't see the need for mass...)