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3 years ago

Would you expect to observe every supernova in our own Galaxy? Why or why not?

Physics

1 answer:

Taya2010 [7]3 years ago

3 0

Explanation:

Only few supernova are observed in our galaxy -

Type II supernovae ( i.e. the explosions of the massive stars ) occurred in the Milky Way, and they might be hidden by the intervening dust if they are located in the more distant parts of our Galaxy .

Type Ia supernovae , which need a white dwarf star in the binary star system , are brighter than the type II supernovae , but some of them could also happen in the older parts of Galaxy which are hidden due to the buildup of the dust and gas .

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Is our universe the size of a grain of sand?

NeTakaya

Answer:

Explanation:

Our universe is not the size of a grain of sand. A grain of sand is approximately 2 millimeters while the size of the universe is approximate 93 billion light years in diameter and recently estimated to be 250 times 93 billion light years which is at least 7 trillion light years.

Light-year is a unit of length used to show astronomical distances.

1 light-year is exactly 9460730472580800 meters.

Comparing the size of a grain of sand to that of the universe,

2 millimeters = 0.002 meters and

9460730472580800 meters = 9.460730472580800 e+18

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3 years ago

An ice cube has a volume of 10cm3. The mass of the bar is 9.2 g. What is the density of the ice cube?

kotykmax [81]

Density = mass /volume = 9.2/10 = 0.92 g/cm3. Hope this helps you!

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3 years ago

Like his parents, Thomas is short, stocky, and heavyset. Although he exercises regularly and eats a well-balanced meal, his body

Viktor [21]

Answer:

Genetics?

Explanation:

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3 years ago

Read 2 more answers

CAN YOU PLS CHECK IF ITS CORRECT I'LL MARK YOU BRAINLIST

Alexus [3.1K]

i think it looks good

yea it correct

BTW yw if it's right

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3 years ago

Read 2 more answers

Ideal gases are often studied at standard ambient temperature and pressure (satp). The international union of pure and applied c

11Alexandr11 [23.1K]

This problem provides information about the pressure and temperature ideal gases are studied at. The answer to the questions are that all molecules have the same density, 2.43x10²⁵ mol/m³ and 2.43x10¹⁹ mol/cm³.

<h3>Idela gases</h3>

In science, we can start studying gases with the concept of ideal gas, as they do not collide one to another and are assumed to be perfect spheres with no relevant interactions.

In such a way, one can conclude that the <u>number density of all ideal gasses at SATP is the same</u>, as they are assumed to be perfect spheres with equal volumes per molecule.

Moreover, when calculating the number of molecules per cubic meter, one must use the ideal gas equation as:

$PV=nRT\\\\\frac{N}{V}= \frac{P*N_A}{RT}$

And plug in the numbers we are given:

$\frac{N}{V}= \frac{100kPa*\frac{1000Pa}{1kPa}*6.022x10^{23}molec/mol}{8.314\frac{Pa*m^3}{mol*K}*298K}=2.43x10^{25}molec/m^3$

Lastly, we can calculate the molecules per cubic centimeter by performing the following conversion:

$2.43x10^{25}\frac{molec}{m^3}*(\frac{1m}{100cm} )^3\\ \\=2.43x10^{19}\frac{molec}{cm^3}$

Learn more about ideal gases: brainly.com/question/26450101

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2 years ago