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3 years ago

_____ describes the life cycle of a star. nuclear fusion nebular clouds stellar evolution the big bang

Physics

2 answers:

EleoNora [17]3 years ago

6 0

Stellar Evolution is the answer! :)

Anastasy [175]3 years ago

5 0

Answer:

Stellar evolution

Explanation:

Nuclear fusion is the process that goes inside a star which powers the star.

Nebular clouds are just clouds of dust (mostly hydrogen and helium) from which a star is born.

Stellar evolution describes the various stages in the life of a star.

The big bang describes how the universe as we know it actually is created. It says universe is created by the explosion of the tiny and highly dense singularity .

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Which element does not have the same number of electrons in its outermost shell as the other elements in its group?(1 point)

Setler79 [48]

Helium (He) does not have the same number of valence electrons as other elements in its group.

The periodic table is divided into groups with the last number of the group coinciding with the number of electrons that an element in the group has in its outermost or valence shell.

Helium is in group 18 which means that it should have the same number of valence electrons as :

Neon
Argon
Krypton
Xenon and,
Radon

Yet Helium only has 2 valence electrons. We can therefore conclusively say that Helium does not have the same number of valence electrons as other elements in its group.

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3 years ago

Read 2 more answers

You leave the doctor's office after your annual checkup and recall that you weighed 688 N in her office. You then get into an el

Lapatulllka [165]

Answer:

$a=0.5418\ m.s^{-2}$ upwards

$a=1.283\ m.s^{-2}$ downwards

Explanation:

Given:

weight of the person, $w=688\ N$

So, the mass of the person:

$m=\frac{w}{g}$

$m=\frac{688}{9.81}$

$m=70.132\ kg$

Now if the apparent weight in the elevator, $w_a= 726\ N$

Then the difference between the two weights is :

$\Delta w=w_a-w$

$\Delta w=726-688$

$\Delta w=38\ N$ is the force that acts on the body which generates the acceleration.

Now the corresponding acceleration:

$a=\frac{\Delta w}{m}$

$a=\frac{38}{70.132}$

$a=0.5418\ m.s^{-2}$ upwards, because the normal reaction that due to the weight of the body is increased here.

Now if the apparent weight in the elevator, $w_a= 598\ N$

Then the difference between the two weights is :

$\Delta w=w-w_a$

$\Delta w=688-598$

$\Delta w=90\ N$ is the force that acts on the body which generates the acceleration.

Now the corresponding acceleration:

$a=\frac{\Delta w}{m}$

$a=\frac{90}{70.132}$

$a=1.283\ m.s^{-2}$ downwards, because the normal reaction that due to the weight of the body is decreased here.

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4 years ago

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What is the use of 'ground' in electric circuit?

ss7ja [257]

In electrical engineering, ground or earth is the reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the earth. Electrical circuits may be connected to ground (earth) for several reasons.

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3 years ago

What is the action force and the reaction force when you sit down on a chair

Licemer1 [7]

The action force is when you are putting your weight on the chair when you are sitting down. the reaction force is the force exerted by the chair that pushes up on your body and is equal to your weight.

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3 years ago

Joanne drives her car with a mass of 1000 {\rm kg} at a speed of 23m/s .

rosijanka [135]

F = ma = 1000*(23-0)/14 = 1642.86 N

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