6.1.115 to approximate the speed of the current of a river, a circular paddle wheel with radius 4 ft. is lowered into the water. if the current causes the wheel to rotate at a speed of 18 revolutions per minute, what is the speed of the current?

1.2 ft/s or 72 ft/min

Explanation:

To solve this problem, we can use the relationship between the angular and linear speed for this particular movement (rotation). As the speed of the current is tangent to the trajectory of the wheel we can define as follows:

The speed of the current is 72 ft/min

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.