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3 years ago

Which of the following consists of several billion stars and interstellar matter?

Physics

2 answers:

zloy xaker [14]3 years ago

4 0

The answer is galaxy

Leya [2.2K]3 years ago

3 0

Answer: Galaxy

Explanation:

A galaxy is a large group of stars. It contains billions of stars, their planetary system, star clusters, nebula and interstellar material made of dust and gases etc.

Nebula is stellar nursery where stars are born. It is composed of dust and gases.

Planets are found in a star system like solar system has 8 planets. Solar system is present in Milky way galaxy.

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A set is any collection of objects. true or false.

Semenov [28]

It can be, but set also means many other things.

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4 years ago

A carbon rod with a radius of 1.9 mm is used to make a resistor. What length of the carbon rod should be used to make a 3.7 Ω re

vladimir2022 [97]

Answer:

Length = 2.32 m

Explanation:

Let the length required be 'L'.

Given:

Resistance of the resistor (R) = 3.7 Ω

Radius of the rod (r) = 1.9 mm = 0.0019 m [1 mm = 0.001 m]

Resistivity of the material of rod (ρ) = $1.8\times 10^{-5}\ \Omega\cdot m$

First, let us find the area of the circular rod.

Area is given as:

$A=\pi r^2=3.14\times (0.0019)^2=1.13\times 10^{-5}\ m^2$

Now, the resistance of the material is given by the formula:

$R=\rho( \frac{L}{A})$

Express this in terms of 'L'. This gives,

$\rho\times L=R\times A\\\\L=\frac{R\times A}{\rho}$

Now, plug in the given values and solve for length 'L'. This gives,

$L=\frac{3.7\ \Omega\times 1.13\times 10^{-5}\ m^2}{1.8\times 10^{-5}\ \Omega\cdot m}\\\\L=\frac{4.181}{1.8}=2.32\ m$

Therefore, the length of the material required to make a resistor of 3.7 Ω is 2.32 m.

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3 years ago

List the planet name and position from the Sun for each one (1, 2, 3)

IgorLugansk [536]

Answer:

The planets in order from the sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and finally the dwarf planet Pluto. Most people have at least heard about our solar system and the planets in it.

Explanation:

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2 years ago

What kind of quantity is displacement?

Serhud [2]

Answer:

calar quantity, length of path. displacement: vector quanity, "as the crow flies" difference between start and finish regardless of path taken. Term.

Explanation:

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3 years ago

A track star runs 100 meters in 10 seconds. What is the star's average speed?

kakasveta [241]

Answer:

10m/s

Explanation:

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3 years ago