please help see attached

Question

anonymous · Answer

attachment

anonymous · Answer

@whpalmer4  could u help me ?

whpalmer4 · Answer

I'm looking at the problem, and I'm not seeing how it is that there is only one such arc which could answer the question!

anonymous · Answer

:/ and this problem doesnt have answer in the book

whpalmer4 · Answer

that's 100% of the information given about the problem?

anonymous · Answer

yes!!

whpalmer4 · Answer

let me consult with my esteemed colleague, the cat who just jumped into my lap :-)

anonymous · Answer

lol!!

anonymous · Answer

i do have another question i need help on and can always just ask my teacher tomorrow about this one!

anonymous · Answer

so maybe will just ask the other question i have lol

whpalmer4 · Answer

go ahead and ask it, maybe we can make some progress there!  I'm still scribbling on this one

anonymous · Answer

ok :) so here it is there r a few i am chewing on to figure out lol

anonymous · Answer

:)

anonymous · Answer

@Mertsj could u help maybe with first question please

whpalmer4 · Answer

okay, the first of the second batch: the pendulum is like the radius of a circle, right?  Find the circumference of the circle, and then take 8/360 of it, because there are 360 degrees in one complete trip around the circle.

whpalmer4 · Answer

Second one, you'll do something similar, except with areas, and you'll do it twice: once for the outer radius, to get the entire circle, and once for the inner radius, to get the area to subtract away.  Then take 130/360 of the annular ring's area.

whpalmer4 · Answer

3rd one you should be able to figure out by extension from these two.

whpalmer4 · Answer

Okay, I guess we can draw something like this:|dw:1392686496956:dw|

whpalmer4 · Answer

$$h=r-18$$$$h^2+30^2 = r^2$$$$(r-18)^2 + 30^2 = r^2$$Solve that for $r$ to get the radius of the circle under the bridge

whpalmer4 · Answer

I guess that does mean that there's only one circle that fits, but it doesn't instinctively feel that way, does it?

anonymous · Answer

so for the second one with the windshield which number do i use for the r?

whpalmer4 · Answer

well, you have two radii.  The outer edge of the ring has $r = 18$.  What about the inner edge of the ring?

anonymous · Answer

12 inches?

whpalmer4 · Answer

look at the drawing more carefully.  they are hoping you'll fall into that trap :-)

anonymous · Answer

?? not sure

whpalmer4 · Answer

|dw:1392687897082:dw|
sorry about the bad artwork!