Question 1133196: Two bridges on the Blake River are 10 km apart. You can see along the river from one bridge to the other. A telescope was placed on one bridge, and a bull's-eye target was placed on the other bridge. Each was 6 metres above the surface of the water.
As part of an experiment, the telescope was lined up on the target. During the experiment, a boat passed between the target and the telescope. The tip of the mast appeared in front of the target as viewed through the telescope, yet the tip of the mast was only five metres above the water.
The best explanation for the mast tip being seen through the telescope was that it was caused by: -
A. The tidal pull of the moon
B. The slope of the river as it flows to the sea
C. bending of the light in damp air over the river
D. The curvature of the earth
Answer by ikleyn(52778)   (Show Source):
You can put this solution on YOUR website! .
The ANSWER is A). The tidal pull of the moon.
See the article Tides in the Hudson River at this link
https://www.caryinstitute.org/sites/default/files/public/downloads/curriculum-project/tides.pdf
The citation from this article is below:
"Due to the topography of the landscape, enclosed bays can have tidal ranges of 20 or 40 feet!
The largest daily tide on the Hudson River is over 6 feet, while the smallest is under 3 feet.
The tides in the Hudson come from the rising and falling of the water at the mouth of the river, not the direct action of the moon."
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Good question, and the answer, which I found in the Internet, was unexpected to me . . .
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Added 2 hours later . . .
Regarding the "Black River", see this Internet page
https://tides.mobilegeographics.com/locations/591.html
The maximum tides are about 3 ft there.
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