Elements and compounds
Explanation:
- All pure substances are distinct substances.
- All their parts are the same throughout i.e they are homogeneous.
- They have a definite composition.
- They cannot be easily separated or broken down into simpler substances by physical means.
- They have a unique set of physical properties.
Elements are distinct substances that cannot be split up into simpler ones.
Compounds are substances composed of two or more kinds of atoms joined together in a definite grouping.
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Elements in the universe brainly.com/question/4581837
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Angular velocity means how many radians/degrees is this hand passing by every second.
First, you realize it goes through a whole revolution (2

in radians) in 60 seconds.
This means for every second, it passes by:

For the next part, you need to know this equation:
Tangential velocity=Angular velocity x radius (meters)

Answer:
a
Explanation:
the kinetic energy decreases which makes the molecules bond together, that makes them not be able to move much
Explanation:
3
i believe that they are all going at 3.2 meters each, I did 4 times 0.8