Where does the name "Black Hole" get it's name?

Answers

Answer 1

Answer: The "Black Hole" gets its name from the astronomical amount of gravitational force created by the black hole. This gravitational force is so great that even light cannot escape it, hence, it is completely black

Answer 2

Answer:
nothing escapes them not even light therefore they are (dark) and we see them be literally black holes

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Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not?A.Helium has no mass, but air does.
B.Helium increases the balloon's mass more than air.
C.Helium has a higher density than air.
D.Helium has a lower density than air.

Answers

Compared to the air the density of helium gas is very less. The less dense helium will float on air. That's why balloon filled with He gas rise in air.

What is helium?

Helium is 2nd element in periodic table. It is a non-metal and is placed with the noble gases because it is having fully filled electronic configuration leading to the stability.

Density of a substance is the ratio of its mass to the volume. When a substance is less dense than the fluid on which it occupy, it will float on the fluid. If it is more denser it will sink on it.

The density of helium is very much lower than that of air. Therefore, the balloon filled with helium gas will rise in the air, while the balloon with filled with air does not.

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i think the answer should be D.

Which of the following is another term for a planned economy

Answers

The correct answer would be, Socialist system.

Socialist system is another term for a planned economy.

Explanation:

An economic system, in which the economy(including investment, capital and allocation of capital goods) is governed by a predefined economic and production plans, is called as the Planned Economy.

The system of planning in this economic system can either be centralized, decentralized or participatory.

This economic system is regulated by the Government. All decisions about the capital, lands, buildings, machinery, or other resources are taken by the government.

The production, prices, distribution, etc of the products or services are regulated centrally by the government.

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Answer:

Another term for planned economy is a socialist system.

The common name for the reflection of sound waves is an?

Answers

When sound waves are reflected in the right way so as to be heard
some time after they were generated, then the phenomenon is usually
called an "echo".

Please need help with this one

Answers

op, here is a list of physical properties. Physical is things you can see.

If the mass of Mars is 0.11 ME (mass of Earth) and its radius is 0.53 RE (radius ofEarth), How much is the gravitational field g at the surface of Mars?
Given: ME=6.0x1024 kg and RE=6.4x106m