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3 years ago

How is it possible for two objects to have the same momentum, but different velocities?

1 answer:

8 0

Answer: momentum has the same direction as that of velocity but when 2 bodies with the same linear momentum & different velocities it has different masses because a vector quantity is represented by a cross product of mass and velocity of object .

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American space pilots were called astronauts. What were soviet space pilots called?.

Mnenie [13.5K]

Answer:

Cosmonauts

Explanation:

As the americans are called astronauts which means <em>star sailors </em>and the <em>russians (soviet space pilots) are called cosmonauts</em> which means<em> sailors of the universe</em>

4 0

3 years ago

Calculate the mass of the earth if the radius of the earth is 6.38 × 10^6

Delicious77 [7]

Answer:

Explanation:

C is i thing

7 0

3 years ago

The star Betelgeuse is 6.1 x 10^18 m away from Earth. How old is the light we see from that star when it reaches us? There are 3

castortr0y [4]

Answer:

635 years old

Explanation:

The light reaching the earth from the sun will travel at a speed called the speed of light, and this has a universal value of 3 × 10⁸ m/s. Bearing this in mind, let us calculate the age of the light reaching the Earth from the sun:

Distance of star from Earth = 6.1 × 10⁸m

Speed of light = 3 × 10⁸ m/s

We have distance and speed, let us calculate the time of travel of the light from the star to the earth.

Distance = speed × time

6.1 × 10⁸ = 3 × 10⁸ × time

$time = \frac{6.1 \times 10^{18}}{3 \times 10^8}$

In order to do the division above, we will divide the whole numbers normally, then we will apply the law of indices to the power that says:

Xᵃ ÷ Xᵇ = X⁽ᵃ⁻ᵇ⁾

$\therefore time = \frac{6.1 \times 10^{18}}{3 \times 10^8}\\= \frac{2.03 \times 10^{(18-8)}}{1} \\= 2.03 \times 10^{10}}\ seconds$

Next, we are told that there are 3.2 × 10⁷ seconds in a year.

∴ The number of years travelled by the light from the star:

$3.2\ \times 10^7\ seconds = 1\ year\\1\ second = \frac{1}{3.2\ \times 10^7} \\\therefore 2.03 \times 10^{10}\ seconds = \frac{2.03 \times 10^{10}}{3.2\ \times 10^7}$

please note that:

2.03 × 10¹⁰ = 20300000000

3.2 × 10⁷ = 32000000

$\therefore \frac{2.03 \times 10^{10}}{3.2\ \times 10^7}\\= \frac{20300000000}{32000000} \\\\= \frac{20300}{32} \\= 634.347\ years\\$

The closest answer in the option is 635 years, and we are short of this by some points due probably to approximations in the calculation.

8 0

3 years ago

The nonmetal family of the periodic table that wants to gain, lose, or share four electrons is the __________ family.

vivado [14]

<span>d. halogen is the answer</span>

6 0

3 years ago

Read 2 more answers

What elements are solid liquid and gas at room temperature?

Alona [7]

Elemental hydrogen (H, element 1), nitrogen (N, element 7), oxygen (O, element 8), fluorine (F, element 9), and chlorine (Cl, element 17) are all gases at room temperature, and are found as diatomic molecules.

Titanium, Lead, Potassium, and Silicon are solids at normal temperature.

Mercury and bromine (Br) are the only liquid elements at standard pressure and temperature (Hg).

<h3>What are chemical elements?</h3>

A chemical element is a species of atoms, including the pure substance made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.

To learn more about chemical elements visit:

brainly.com/question/20573603

#SPJ4

3 0

2 years ago