Answer:
At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels. ... Since most of the atmosphere's molecules are held close to the earth's surface by the force of gravity, air pressure decreases rapidly at first, then more slowly at higher levels.
Explanation:
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Force is a vector quantity and denotes any interaction that change the motion of an object in a certain direction. When influence by force an object can change its velocity or
The two things that are a included when describing force are: magnitude and direction. To fully describe the force acting upon an object, you must describe both the magnitude (size or numerical value) and the direction.
Answer:
A. They do not require a medium to carry information.
D. They carry information very quickly.
Explanation:
The two characteristics that makes electromagnetic waves effective in communication is that they do not require a medium to carry information and they move information very quickly.
- Electromagnetic waves are produced by the vibration between electrical and magnetic fields.
- These waves are notable for being able to propagate without requiring any medium for their movement.
- They also have very fast speed.
- The speed of all electromagnetic waves is equal to that of light.
Answer:
The wheel and axle is another simple machine. It uses a wheel with a rod attached in the middle as an axle to help it to lift or move loads. In some cases this machine works like a lever to multiply force (like with a doorknob or a fishing reel).
Answer:
Joule that is equal to m2*kg*s-2
Explanation: