A Carnot’s engine whose temperature of the source is 400 K takes 500 calories of

Because while our lakes are Great, they're comparatively much smaller than oceans. And the gravitational pull isn't strong Low tide is when it recedes to its furthest extent. Some freshwater rivers and lakes can have tides, too. A high tide that is significantly higher than normal is called a king tide. ... The moon's gravitational pull on the Earth and the Earth's rotational force are the two main factors that cause high and low tides.

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