Why does the spectroscopic parallax method only work for main sequence stars?.

Answers

Answer 1

Answer:

Only main sequence stars have a well-defined relationship between spectral type and luminosity.

Explanation:

Low-mass stars have much longer lifetimes than high-mass stars.


Related Questions


Calculate the volume of 500 kilograms
to 2 decimal places
flead if the density of lead is 11400 kg/m². Give your answer
Enter your answer to 2 decimal places

Answers

Answer:

d (density) = M / V

V = M / d = 500 kg / (11400 kg / m^2 = .044 m^3

If all of the resistors in the circuit were decreased in value by a factor of 1,000, would the current in each resistor simply increase by a factor of 1,000? explain your answer

Answers

In a circuit, if the resistors were decreased by a factor of 1,000, it is true that the current would increase by a factor of 1,000, according to Ohm's Law.

What is Ohm's Law?

It is a law in electricity that posits that the voltage that goes through a conductor is directly proportional to the current.

How does Ohm'slaw explain the change in current?

One formula in Ohm's law is:

Voltage = Current x Resistance

If the resistance were to decrease by a factor of 1,000, the current would have to increase by a factor of 1,000 as well in order to give the same voltage.

Find out more on Ohm's law at https://brainly.com/question/14296509.

Find fff, the magnitude of the force applied to each side of the nutcracker required to crack the nut

Answers

Force is a vector, as such we know that the force required to crack a nut is the resultant of the individual forces applied form all sides of the nut.

What is force?

The term force is used to describe that which causes a change in the position of an object. Now the question is incomplete but I will try to help you the much I can.

Recall that force is a vector quantity. Hence the magnitude of the force required to crack a nut is the resultant of the individual forces applied form all sides of the nut.

Learn more about force: https://brainly.com/question/26115859

Question 4 of 5
The picture shows a model of a cell.
W
What is the main function of the part labeled Win the model?

Answers

Explanation:

it is not clear. I can't see w.

1. The Particle Theory of Matter says that. A. Particles are in constant motion
b. Everything is made up of particles
c. Plasmas have charged particles
d. Solids have no particles

Answers

Answer:

a. Particles are in constant motion.

Light travels at 3.0 × 108 m/s in a vacuum. use the index of refraction for water to determine the speed of light in water. round your answer to the nearest tenth. × 108 m/s

Answers

Answer:

the answer is 2.3. I just answered this question and got it right.

Explanation:

The phenomenon bending of a wave as it crosses from one medium to another is said to be refraction. The speeds of light in the water will be 2.25×10⁸ m/sec.

What is the definition of refraction?

The phenomenon bending of a wave as it crosses from one medium to another is said to be refraction. The difference in density is the cause of the bending.

Refraction is a term that is used to describe the phenomenon of refraction."The change in direction of a wave traveling through one medium to another is known as refraction."

The following data are given in the problem;

C is the Speed of light in a vacuum =3×10⁸ m/sec.

n is an index of refraction for water = 1.333

v is the speed of light in the water=?

The index of refraction is the ratio of the speed of light in a vacuum to the speed of light in water. By the formula of the index of refraction.

[tex]n=\dfrac{c}{v}[/tex]

[tex]V=\dfrac{c}{n}[/tex]

[tex]V=\dfrac{3\times10^8}{1.333}[/tex]

[tex]V=2.25\times 10^8 m/s[/tex]

Hence the speed of light in the water will be 2.25×10⁸ m/sec.

To learn more about refraction refer to the link;

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An iron sphere of radius 0.18m has mass 190 kg. Calculate the density of the iron

Answers

radius=r=0.18m

Volume:-

[tex]\\ \sf\rightarrowtail \dfrac{4}{3}\pi r^3[/tex]

[tex]\\ \sf\rightarrowtail \dfrac{4}{3}\pi (0.18)^3[/tex]

[tex]\\ \sf\rightarrowtail \dfrac{4}{3}\pi (0.005832)[/tex]

[tex]\\ \sf\rightarrowtail 0.024m^3[/tex]

Mass=190kg

Density:-

[tex]\\ \sf\rightarrowtail \dfrac{Mass}{Volume}[/tex]

[tex]\\ \sf\rightarrowtail \dfrac{190}{0.024}[/tex]

[tex]\\ \sf\rightarrowtail 7916.67kg/m^3[/tex]

what is the weight of an object (on earth) that has a mass of 4.5kg
weight=
mass=
gravity=
formula:
substitution:
answer:

Answers

Answer:

weight-44.1 kg- mass-4.5kg gravity-9.8 formula-(see explanation)

Explanation:

force/weight on earth is = mass x gravitational field strength

Choose all the answers that apply.
The United States
launched the first man into space
built the first space station
sent the first animal into space
was the first country to send a person to the moon
successfully landed å spacecraft on the moon

Answers

Answer:

launched the first man into space

was the first country to send a person to the moon

successfully landed å spacecraft on the moon

Sigmund freud believed mental disorders were caused when an individual __________. a. recognized personal negative qualities b. masked painful feelings c. buried feelings in the unconscious d. distorted the present reality

Answers

Answer:

C. buried feelings in the unconscious

Explanation:

Hope that helps!

Sigmund Freud believed mental disorders were caused when an individual has buried feelings in the unconscious.

What exactly are mental disorders?

Mental disorders are illnesses that impact your thoughts, feelings, emotions, and behavior.

They might be short-term or long-term. They can have an impact on your capacity to interact with others and operate on a daily basis.

There are several sorts of mental illnesses. Panic disorder, obsessive-compulsive disorder, and phobias are examples of anxiety disorders.

Depression, bipolar illness, and other mood disorders are all examples of mood disorders.,

To learn more about the mental disorder refer to the link;

https://brainly.com/question/939408

a person walks 15.0 m in 5.00 s, and then walks 12.0 m in 10.00 s. What is the average
speed of the person?

Answers

start by dividing 10 secs into 2 groups (it will be easier if the timing is equal) add up 15, 6 and 6, and then divide by 3.

the average speed of the person is 9 meters per 5 seconds

if the impulse acting on an object is 100n waht is force acting on it if the time 1 s

Answers

force = 100 N

Impulse ( N.s ) : Force ( N ) * Time ( s )

100 N.s = force * 1 s

force = 100/1

force = 100 N

Answer :-

The required Force is 100 Newton .

Explanation :-

As per the provided information in the given question, we have been given that the Impulse of the Object is 100 Ns . It's Time is given as 1 sec . And, we have been asked to calculate the Force .

For calculating the Force , we will use the Formula :-

[tex] \bigstar \: \: \: \boxed {\sf { \: Force \: = \: \dfrac {Impulse}{Time} \: }} [/tex]

Therefore , by Substituting the given values in the above Formula :-

[tex] \dag \: \: \: \sf {Force \: = \: \dfrac {Impulse}{Time}} [/tex]

[tex] \Longrightarrow \: \: \: \sf {Force \: = \: \dfrac {100}{1}} [/tex]

[tex] \Longrightarrow \: \: \: \textbf {\textsf {Force \: = \: 100}} [/tex]

Hence :-

Force = 100 Newton .

[tex] \underline {\rule {180pt}{4pt}} [/tex]

When charging objects by induction which of the following must be true
A. A path to ground is not needed when using a positive source

B. The objects being charged must be conductors

C. The objects takes on the same charge as it's source

D. The source loses some of its charge ​

Answers

Answer:

C

Explanation:

because that's how science works

Why is a 1 solar-mass red giant more luminous than a 1 solar-mass main sequence star?.

Answers

Answer:

No

Explanation:

I dont know please help

Which property of the sound wave changes when the volume is increased on a radio?.

Answers

Answer:

amplitude

Explanation:

When we increase the volume of a sound, the amplitude of the wave is increased. The frequency of a wave is related to its pitch. If the pitch is high, then the frequency of the wave is high. This means that the wave will looked squashed on an oscilloscope trace.

Which temperature scale does NOT have negative values?
Celsius
Fahrenheit
Kelvin
All of these are correct

Answers

Answer:

Kelvin scale degrees

Explanation: The Kelvin scale starts at 0°k, the lowest possible temperature, as at this point, all movement stops at an atomical level.

Answer:

Kelvin

Explanation:

Kelvin is the only temperature scale that when it hits 0, the universe would be frozen. it is the lowest possible temperature.

what are various paradox related to time travel?​

Answers

Answer:

This is a paradox — an inconsistency that often leads people to think that time travel cannot occur in our universe." A variation is known as the "grandfather paradox" — in which a time traveler kills their own grandfather, in the process preventing the time traveler's birth

Explanation:

hope this Wil help ....

Because of the costs involved in maintaining high temperatures and pressure, nuclear _______ is not yet a practical method for generating electrical energy.

Which best completes the statement?

fusion
fission
energy
generators

Answers

Answer:

A

Explanation:

i just took the test

Answer:

A - Fusion !

Explanation:

Person above me is correct, I just took "The Impact of Human Activity" Unit Test.

A boy walks up a hill. His displacement from his starting point is (800, 150) m. How much gravitational potential energy has he gained? ​

Answers

Answer:

The potential energy gained is 1500m joule.

Explanation:

Hope this helps!

Answer:

Answer: He 1500m joule amount of  gravitational potential energy

Explanation:

Good Luck

hope it helps

Mark as brainliest please

A bus start moving from rest .If its velocity after 5 seconds becames 10 m/s ,find acceleration

Answers

Answer:

2 [tex]m/s^{2}[/tex]

Explanation:

acceleration = (final-initial velocity) / time

                     = (10-0)/5

                     =2

For ____________, the error is calculated by finding the sum of squared distance between actual and predicted values

Answers

Answer: It is minimising

For minimizing, the error is calculated by finding the sum of the squared distance between actual and predicted values.

What is the error?

The difference between the measured and analysis of the financial statements might well be defined as an error. For instance, if the two operators use the same complete and precise tool.

We have:

For ____________, the error is calculated by finding the sum of the squared distance between actual and predicted values

The correct answer is minimizing because according to the information provided in the problem. The sum of squared distance between actual and anticipated values is calculated to "minimize" the mistake.

This is one of the most significant aspects of statistics, and it involves mathematical computations involving error calculations for various values.

Thus, for minimizing, the error is calculated by finding the sum of the squared distance between actual and predicted values.

Learn more about the error here:

https://brainly.com/question/13089857

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If an electron, moving from east to the west, enters a uniform magnetic field what is the direction of the magnetic field

Answers

Answer:

The electron moves undeflected through the field

Conduction is greater in solids .explain in your own words Why?

Answers

Explanation:

because conduction takes place in objects whose particles are close/touching each other therefore conduction happens in solid as liquid and gas paricles are not close to each other

what is the power of a device with resistance 1000 ohms if a current of 8a is flowing through it? give your answer in watts.

Answers

You have to find voltage first.

1000×8= 8000V

Then you use the formula P=IV

P=(8)(8000)

P=64,000 Watts

I think this is right

What type of gas absorbs and re-emits infrared radiation?.

Answers

Answer:

Carbon Dioxide absorbs and re-emits the infrared radiation.

A group of physics students set a tuning fork of 500 Hz just above a big cooking pot. The tuning for is struck and continues to ring throughout the experiment. The students pour water into the pot until they hear the resonance of the fundamental mode.

If the cooking pot is 0.2 meters tall, how long is the wavelength of the resonance created?

What is an estimate for the speed of sound in this situation?

You may discover that the speed of sound seems a bit off. Write down some ideas on why that is.

Answers

(a) The wavelength of the resonance created is 0.8 m.

(b) The speed of the sound in the fundamental mode is 400 m/s.

(c) The low value of speed of speed of sound in water calculated may be as a result of low temperature of the water poured into the cooking pot.

Wavelength of the resonance created

The wavelength of the resonance created is determined by assuming the cooking pot to be a closed pipe.

Wavelength of fundamental mode of a closed pile = 4L

where;

L is length of the pipe

λ = 4 x 0.2 = 0.8 m

Estimated speed of sound

The speed of the sound in the fundamental mode is calculated as follows;

v = fλ

v = 500 x 0.8

v = 400 m/s

Sound wave is directly proportional to temperture, as the temperature of the water increases, the speed of sound increases as well.

The low value of speed of speed of sound in water calculated may be as a result of low temperature of the water poured into the cooking pot.

Learn more about speed of sound here: https://brainly.com/question/2142871

11. Which of the following gives the correct relation between the acceleration due to gravity and period of a pendulum?
g = 2πLT2
g = 4π2LT2
g = 2πLT
g = 2π2LT

Please show all of your algebra.

Answers

[tex]\\ \rm\rightarrowtail T=2\pi\sqrt{\dfrac{l}{g}}[/tex]

Derive g

[tex]\\ \rm\rightarrowtail T^2=4\pi^2\dfrac{l}{g}[/tex]

[tex]\\ \rm\rightarrowtail g=\dfrac{4\pi ^2\ell}{T^2}[/tex]

[tex]\\ \rm\rightarrowtail g=\left(\dfrac{2\pi\sqrt{l}}{T}\right)^2[/tex]

A particular lightbulb is designed to consume 40 W when operating on a car's 12-V DC electric power. If you supply that bulb with 12-V AC power from a transformer, how much power will it consume

Answers

40V because it will provide the same amount of power.

C(i). A body weighs 600g in air and 400g in water. Calculate;
i. Up thrust of the body
ii. Volume of the body
iii. Relative density of the solid
iv. Density of the solid

Answers

Answer:

B buoyant force (mass) = 600 - 400 = 200 g       (I)

upthrust is 200 g due to decrease in apparent body weight

(Note that g is being treated as force here when it is actually mass)

D = M / V     definition of density

since density of water is 1 (1 g / cm^3)

from (I) the equivalent volume of water is 200 cm^3 since the upthrust will equal the weight of the water displaced

Relative density of solid is 600 g / 200 g = 3     (weight of solid vs the weight of the water displaced

D = 3 g / cm^3       density of solit

A man tries to push a 200 kg Car that moves at a acceleration 0.50 m/s2. The man is able to displace the car 10 m. How much work did he do?

Answers

The work done by the man pushing the car over the given distance is 1000J.

Given the data in the question;

Mass of car; [tex]m = 200kg[/tex]Acceleration of the car; [tex]a = 0.5m/s^2[/tex]Distance covered by the car; [tex]d = 10m[/tex]

Work done; [tex]W = \ ?[/tex]

Work done

Work done is simply defined as the energy transfer that takes place when an object is either pushed or pulled over a certain distance by an external force. It is expressed as;

[tex]Work\ done = f * d[/tex]

Where f is force applied and d is distance travelled.

To determine the work done by the man, we first solve for the force applied F.

From Newton's Second Law; [tex]Force \ F = m * a[/tex]

We substitute our given values into the expression

[tex]F = m * a \\\\F = 200kg * 0.5m/s^2\\\\F = 100kg.m/s^2[/tex]

Next we substitute our values into the expression of work done above.

[tex]Work \ done = f * d\\\\Work \ done = 100kg.m/s^2 * 10m\\\\Work \ done = 1000kgm^2/s^2\\\\Work \ done = 1000J[/tex]

Therefore, the work done by the man pushing the car over the given distance is 1000J.

Learn more about work done: https://brainly.com/question/26115962

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