Astronauts in orbit are not truly weightless.

Answers

Answer 1

Answer: They are not weightless since there is no gravity there is nothing holding them down causing their weight to decrease in space

Answer 2

Answer:

Answer:

it is true

Explanation:

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The process shown in this diagram contributed great amounts of heat to the young planet Earth and is best known as radioactive A) decay. B) fission. C) fusion. D) isotope.

The density of water is 1.00 g/cm3. The density of ethanol is 0.80 g/cm3. What is the volume of ethanol, in cm3 that has the same mass as 100 cm3 of water?

Answers

Explanation:

Given that,

The density of water is 1 g/cm³

The density of ethanol is 0.8 g/cm³

We need to find the volume of the ethanol that has the same mass as 100 cm³ of water.

Density=mass/volume

For water,

$d=(m)/(V)\n\nm=dV\n\nm=1\ g/cm^3* 100\ cm^3\n\nm=100\ g$

For ethanol,

$d=(m)/(V)\n\nV=(m)/(d)\n\nV=(100\ g)/(0.8\ g/cm^3)\n\nV=125\ cm^3$

Hence, 125 cm³ of ethanol has the same mass as 100 cm³ of water.

Answer:

1.00 g/cm3

Explanation:

A bookshelf is 2m long, with supports at its end (p and q). A book weighing 10N is placed in the middle of the shelf. what are the upward forces acting on p and q. if the book is moved 50 cm from q, what are the forces at p and q now?

Answers

When the book is placed in the middle, the forces acting on p and q is 5N. When the book is moved 50 cm from q, the forces at p and q can be solved by doing a moment balance
With p as the pivot
Fq (2 m) = 10 N (0.5 m)
Fq = 2.5 N
and
Fp = 10 N - 2.5 N = 7.5 N

Answer:

Fq = 2.5N

Fp = 7.5N

Explanation:

Hello! Let's solve this!

When the book is in the middle, the force in p (Fp) and the force in q (Fq) are equal, and half of the total force

Fp = Fq = 5N

When the book moves 0.5m from q we have a balance

Fq * 2m = 10N * 0.5m

We cleared Fq

Fq = (10N * 0.5m) / 2m

Fq = 2.5N

Fp = 10N-Fq = 10N-2.5N = 7.5N

Conclusion

Fq = 2.5N

Fp = 7.5N

When magnesium (Mg2+) and fluorine (F1-) combine in an ionic bond, the resulting formula will be A) Mg2F.

B) Mg2F2.

C) MgF.

D) MgF2.

Answers

Answer is: D) MgF₂.

Magnesium fluoride is salt, ionic compound.

1) Magnesium (Mg) is metal from 2. group of Periodic table of elements and has low ionisation energy and electronegativity, which means it easily lose valence electons (two valence electrons).

Magnesium has atomic number 12, which means it has 12 protons and 12 electrons. It lost two electrons to form magnesium cation (Mg²⁺) with stable electron configuration like closest noble gas neon (Ne) with 10 electrons.

Electron configuration of magnesium ion: ₁₂Mg²⁺ 1s² 2s² 2p⁶.

2) Fluorine (F) is nonmetal with greatest electronegativity, which meand it easily gain electrons.

Fluorine jas atomic number 9, which means it has 9 protons and 9 electrons. It gain one electron to form fluorine anion (F⁻) with stable electron configuration like closest noble gas neon (Ne) with 10 electrons.

Electron configuration of fluorine ion: ₉F⁻ 1s² 2s² 2p⁶.

The fluorine has one spare electron per atom and the magnesium has a need for 2. This means for one magnesium you need two fluorine atoms making the formula MgF2.

A submarine is 46 m below sea level, and it descends 24 m. How far below sea level is it? a. The submarine is 70 m below sea level. b. The submarine is 46 m below sea level. c. The submarine is 24 m below sea level. d. The submarine is 94 m below sea level.

Answers

Answer:70 m below

Explanation:

46 +24= 70

What is the final temperature when 50 g of water at 20°c is mixed with 75 g of water at 60°c

Answers

44C i think. Do you have options for the answer?

What instrument uses a magnetic field to magnify imags up to 100000000?

Answers

transmission electron microscope

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