Answer: Clouds are evaporated sea water. You should be asking "Why does the gravity on Earth pull us down and not evaporated water.
Explanation:
Answer:
The centripetal acceleration 
of an object moving in a uniform circular path is given by the following equation:
Where:
is the velocity
is the radius of the circle
The actual answer is 165 miles, but using significant figure rules the answer is 200. This is because the sig fig rules are as follows ...
<span>1. Non-zero digits are always significant.
2. Any zeros between two significant digits are significant.
<span>3. A final zero or trailing zeros in the decimal portion ONLY are significant.
</span></span>
So the zeroes in a number like 20 or 23,000 are NOT significant. When you add numbers you must find the addend with the lowest amount of significant figures and round the answer to that. In this case most of the addends only have one sig fig, so you round 165 to 200 to make it only have one sig fig.
Yes, D is the correct answer. The ammeter reads 9 Amps, and that current is flowing down, away from the intersection.
The reason is simple, and I'm sure you must have learned it somewhere along the way:. The sum total of all the currents INto any point in a circuit is equal to the total of the current OUT of the same point. In other words: The sum total of the current building up at any point in a circuit is ZERO.
Why ? Current is a river of electrons. If there's more current arriving at a point or leaving it, then you need something there that can create new electrons, store them, destroy them, or eat them.
The picture shows 5+7=12A arriving at the intersection, so you need 12A leaving that point. 3A + the ammeter reading = 12A.
Got it now ?
