PHYSICS HIGH SCHOOL

If 1.3 grams of air has a volume of 1000cm ^3, what is the density of air? A) 1300g/cm^3
B) 1001.3 g/cm^3
C) 769.23 g/cm^3
D) 0.0013 g/cm^3

Answers

Answer 1

Answer:

Density, $d=0.0013\ g/cm^3$

Explanation:

Given that,

Mass of the air, m = 1.3 grams

Volume of the air, $V=1000\ cm^3$

The density of the air is given by total mass divided by total volume. Mathematically, it is given by :

$d=(m)/(V)$

$d=(1.3\ g)/(1000\ cm^3)$

$d=0.0013\ g/cm^3$

Hence, this is the required solution.

Answer 2

Answer: D)
Density is equal to mass/volume, so in your case:
density=1.3/1000=0.0013 g/cm^3

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What causes a bolt of lightning? A. Electrical charges build up in the clouds only.

B. Electrical charges build up on the ground only.

C. Electrical charges build up in the clouds and on the ground.

D. Electrical charges build up in the space between the clouds and the ground.

Answers

As we know that Lightning is an electric current.
The positive charge that is present in the ground connects with the negative charge that is present in the clouds and a spark of lightning strikes.
so a bolt of lightning is caused because
Electrical charges build up in the clouds and on the ground
so correct option is C
hope it helps

The causes of bolt lighting is Electrical charges build up in the clouds and on the ground.

What is bolt lighting?

Lightning refer to spark of electriccharges or lighting which is a a result of positive and negative electrical charges which is as a result of thunder or storm.

Therefore, The causes of bolt lighting is Electrical charges build up in the clouds and on the ground.

Learn more about bolt lighting below.

brainly.com/question/1619949

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What is the weight, on Earth, of a book with a mass of 1.5 kg

Answers

Answer: 14.7 N

Explanation:

The weight of an object on Earth is given by

$W=mg$

where

m is the mass of the object

$g=9.81 m/s^2$ is the acceleration due to gravity on Earth's surface

In this problem, we have a book of mass m=1.5 kg, so its weight is given by

$W=mg=(1.5 kg)(9.81 m/s^2)=14.7 N$

The answer is
D) 14.7 N

A train moves at a constant velocity of 90 km/h. How far will it move in 0.25h?

Answers

In 0.25h it will move in 22.5 kilometers.

How does critical mass play a role in nuclear reactions?It is the minimum amount of material needed to start a fission reaction.
It is the minimum amount of material needed to start a fusion reaction.
It is the minimum amount of material needed to sustain a fission reaction.
It is the minimum amount of material needed to sustain a fusion reaction.

Answers

Answer;

C.It is the minimum amount of material needed to sustain a fission reaction.

Explanation;

-A critical mass is the smallest or the minimum amount of fissile material needed for a sustained nuclear chain reaction. A critical mass must be achieved in order for the chain reaction to continue and release the atomic energy. A critical mass is needed for both a nuclear reactor and an atomic or hydrogen bomb.

-The critical mass of a fissionable material depends upon its nuclear properties (specifically, the nuclear fission cross section), its density, its shape, its enrichment, its purity, its temperature, and its surroundings.

The correct answer for above statement is:

c.It is the minimum amount of material needed to sustain a fission reaction.

Explanation:

A nuclear reaction is taken into account to be the method during which 2 nuclear paticles (two nuclei or a nucleus and a nucleon) move to supply 2 or a lot of nuclear particles or gamma rays.

Thus, a natural action should cause a change of a minimum of one nuclide to a different. typically if a nucleus interacts with another nucleus or particle while not dynamic the mature of any nuclide, the method is mentioned a nuclear scattering.

The important mass is that the smallest amount of fissile material required to sustain nuclear reactions below expressed conditions

A _______ satellite records reflected wavelengths from Earth's surface.

Answers

A visible satellite images records reflected wavelengths from Earth's surface.

Visible satellite images record visible light coming from the sun that is reflected by clouds, land, oceans or snow and ice.
There is a big difference between visible and infrared images since visible images record reflected light rather then emitted radiation.

A wave will "break" because ________. a wave will "break" because ________. the sediment load of water is greater near the shore of random molecular motion in wave forms the density of water increases closer to shore the bottom interferes with its oscillatory motion the wind increases its speed near shorelines

Answers

A wave will "break" because the bottom interferes with its oscillatory motion. Breaking of waves may occur anywhere that the amplitude is sufficient, including in mid-ocean. When waves enter shallow water they break because the motion of water in lower part of the wave nearest the bottom is slowed by friction so that their oscillation is faster than its supporting portion at the bottom. Thus, the wave collapses forward and breaks.

Final answer:

A wave breaks due to the interference of the ocean floor with its oscillatory motion. As the wave nears the shore and the water gets shallower, the bottom of the wave slows down while the top continues its original speed, causing the wave to break.

Explanation:

A wave will 'break' or crash due to its interaction with the ocean floor as it approaches the shore. Waves follow an oscillatory motion, moving in an up-down pattern. When a wave gets closer to shore, the water becomes shallower which interferes with the oscillatory motion of the wave. The bottom of the wave slows down upon hitting the ocean floor while the top of the wave continues its original speed. This causes the wave to become steep and eventually break, forming the crashing wave front we often see on beaches.