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4 years ago

Astronomers estimate that new stars form in our galaxy at the rate of about

Physics

1 answer:

insens350 [35]4 years ago

7 0

Explanation:

The quantity at which the speed of formation of the star depends is called the "star formation rate".
Astronomers estimate that in our Galaxy the star formation rate is about 3 solar masses per year
According to "solar mass per year" the mass of interstellar gas and dust related to about 3 times the mass of the Sun goes into stars each year).
However, the whole of the mass doesn't necessarily go in the formation of 1 star.

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X-rays are used instead of visible light because X-rays have shorter ______________ than visible light, allowing them to produce

pashok25 [27]

The answer is wavelengths.

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3 years ago

Read 2 more answers

1. a) What is the weight of a 20.0 kg girl on earth?

ki77a [65]

Answer: weight= 196

Explanation:weight= mg

20•9.8= 196

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3 years ago

Of the four states of matter, which has particles that are the most tightly packed together?

iren2701 [21]

Depending on what you are working with, it would be a solid

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3 years ago

What is an atom? Give three 3 examples.

Assoli18 [71]

Answer:

Atom is particle of matter that uniquely defines a chemical element.

Examples of atom:

Hydrogen [ H]
Neon [Ne]
Argon [A]
Iron [Fe]
Calcium [Ca]

<h3>About Atom:</h3>

Atom consists of a central nucleus that is usually surrounded by one or more electrons .Each electron is negatively charged. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.

An early model of the atom was developed by the physicist Ernest Rutherford in 1913. He was the first to suggest that atoms are like miniature solar systems except that the attractive force is not caused by gravity, but by opposing electrical charged.

Hope this helps....

Good luck on your assignment...

8 0

3 years ago

A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 4.00 m/s, and

Svetlanka [38]

Answer:

a = 1.152s

b = 0.817 m

c = 7.29m/s

Explanation: let the following

From the first equation of linear motion

V = u+at..........1

parameters be represented as :

t = Time taken

v = Final velocity

a = Acceleration due to gravity = 9.8m/s²

u = Initial velocity = 4 m/s

s = Displacement

V = 0

Substitute the values into equation 1

0 = 4-9.8(t)

-4 = -9.8t

t = 4/9.8

t = 0.408s

From : s = ut+1/2at^2.........2

S = 4×0.408+0.5(-9.8)×0.408^2

S= 1.632-4.9(0.166)

S = 1.632-0.815

S = 0.817m

Her highest height above the board is 0.817 m

Total height she would fall is 0.817+1.90 = 2.717 m

From equation 2

s = ut+1/2at^2

2.717 m = 0t+0.5(9.8)t^2

2.717 m = 0+4.9t^2

2.717 m = 4.9t^2

2.717/4.9 = t^2

0.554 =t^2

t =√0.554

t = 0.744s

Hence, her feet were in the air for 0.744+0.408seconds

= 1.152s

Also recall from equation 1

V= u+at

V = 0+9.8(0.744)

V = 7.29m/s

Hence, the velocity when she hits the water is 7.29m/s

Finally,

a = 1.152s

b = 0.817 m

c = 7.29m/s

4 0

3 years ago