How far does a point on the tip of a rotor blade travel when it makes one complete revolution?

Question

anonymous · Answer

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anonymous · Answer

When it makes one revolution, it will have traveled the circumference of the circle.

The formula for the circumference of a circle is
$$C=\pi d=2\pi r$$
Where r is the radius of the circle.

anonymous · Answer

I dnt understand how to solve this still

anonymous · Answer

The picture shows you the radius (the center of the blades to the edge).  Plug that value in as r in the formula.  $$\pi$$ is approximately 3.14.  I'm not sure if your teacher want an exact (then don't do anything after plugging in the value) value or an approximate (use a caluclator to multiply the value times 3.14) value.

anonymous · Answer

plug it into what

anonymous · Answer

The formula I gave you.
$$C=2\pi r$$
C is the circumference...the distance *around* a circle.  That is the distance the point of the blade will travel when it makes one revolution.

Plug the radius they show you in the picture into that formula.

anonymous · Answer

r in the forumla is the radius.

anonymous · Answer

so I do c=2 the pie sign 18 ft

anonymous · Answer

can you just write what I put onto my caluculator I dont understand

anonymous · Answer

What you typed in the last post is exactly right.  type the 2 x pi x 18 into the calculator and it will give you the answer