You are trying to fish in the tidal flats near Charleston, SC. You check the tid
ID: 111547 • Letter: Y
Question
You are trying to fish in the tidal flats near Charleston, SC. You check the tide charts since the marina only has water at high tide to float your boat. How many high tides would you expect to see in a day? 1, 2, 3, or 4?
Which of the following BEST explains the daily tidal changes?
rotation of the Earth relative to the moon
B.
rotation of the moon relative to the Earth
revolution of the moon around the Earth
revolution of the Earth around the moon
So you successfully arrive at the marina, from the question above, at high tide! When do you have to be back at the next high tide to ensure you have enough water to drive your boat up to the boat ramp?
6 hours
12 hours
12 hours 25 minutes
24 hours
A.rotation of the Earth relative to the moon
B.
rotation of the moon relative to the Earth
C.revolution of the moon around the Earth
D.revolution of the Earth around the moon
Explanation / Answer
Two high tides in a day, because the Earth rotates through two tidal “bulges” every lunar day, coastal areas experience two high and two low tides every 24 hours and 50 minutes. High tides occur 12 hours and 25 minutes apart. It takes six hours and 12.5 minutes for the water at the shore to go from high to low, or from low to high.
A. Rotation of Earth related to moon
Most of Halley's lunar acceleration was only apparent. It was actually the earth's rotation slowing down, making the moon appear to accelerate. The moon does accelerate (strictly, it decelerates), but the larger effect is the earth's rotational braking.
C. 12 hours 25 minutes
because the Earth rotates through two tidal “bulges” every lunar day, coastal areas experience two high and two low tides every 24 hours and 50 minutes. High tides occur 12 hours and 25 minutes apart. It takes six hours and 12.5 minutes for the water at the shore to go from high to low, or from low to high.
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