The work done is B. 
Explanation:
The work done by a force on an object is given by
where
F is the magnitude of the force
d is the displacement of the object
is the angle between the direction of the force and of the displacement
For the boat in this problem, we have:
F = 250 N (force applied)
d = 50 m (displacement)
Substituting, we find the work done:
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Tide is the alternating pattern of rising and falling sea level with respect to land.
There are three types of tide relative to the position of the moon and sun to that of the earth.
1. Spring tides. Occur when the moon sun and earth arrange themselves more or less in a straight line, like an arrow. These tides are the highest and lowest tides.
2. Perigean spring tides. Occur when the new moon or full moon closely aligns with perigee, the closest point to the earth in the moon's orbit. These tides are not as high or low as the spring tides.
3. Neap tides. Occur when the sun and the moon are at right angles as seen from earth.The tides are at minimum range.
Explanation:
heat engine is correct answer
