Question 15 (3 points) Astronauts in the space shuttle feel weightless because Q

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Question 15 (3 points)

Astronauts in the space shuttle feel weightless because

Question 15 options:

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Question 16 (3 points)

Freezing is a _______ ______ that requires energy ________ for the melting system.

Question 16 options:

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Question 17 (3 points)

Some scientists assert that there would be no life on earth if ice did not have a molecular structure with a lot of open space because

Question 17 options:

a) there is no atmosphere where they are. b) they are moving very rapidly. c) They are so far away from the center of the Earth. d) they are in a constant state of free – fall.

Explanation / Answer

Solution.

Dear student: These are the solutions we reccomend to you.

Question 15,

Zero gravity (weightless) is defined as the State in which a body that has a certain weight, is contrasted with other force or stays in fall free without feeling the effects of the atmosphere. As you can see in the previous statment is due to effects of atmosphere which mainly causes weight. Consequently I suggest you to pick up OPTION a).

Question 16.

The freezing is reached in a solution when energy of the molecules becomes smaller as the temperature decreases. the increase of the Intermolecular forces of attraction and the decline of the energy are the causes of liquids crystallize.

Therefore an increase in energy would produce the system to melt, consequently I suggest you to pick up OPTION C, that is:

Freezing is a chemical change that requires energy input for the melting system.

Question 17.

So that make the long story short I would suggest you to choose OPTION C.

The density of ice would be greater than water and lakes would freeze solid - from the bottom up.

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