"before cell phones, people who needed mobile communications ability installed radio telephones in their cars. in the radio telephone system, there was one central antenna tower per city, and perhaps 25 channels available on that tower. the cellular phone system divides the area of a city into small cells."
I hope this helps ^-^
The answer is C) Surface runoff.
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Answer:
.
Assumptions:
- The object is dropped in a free fall.
- There's no air resistance.
- The downward acceleration due to gravity is
Explanation:
Consider the "SUVAT" equation
,
where
- is the final velocity,
- is the initial velocity,
- is the acceleration of the object, and
- is the change in the object's position.
For example, if the bottle needs to achieve a speed of by the time it reaches the ground,
- since the statement that the bottle is "dropped" implies a free fall.
- .
Apply the previous equation to find the minimum height, :
.
Replace the value and apply the formula to find the minimum height required to reach different final speeds.