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January 29, 2015

January 29, 2015

Posted by **Bob** on Wednesday, November 19, 2008 at 11:51am.

I know that the radius is the change in arc length divided by the change in the angle in radians, but I don't understand the second sentence (the 35 rev part).

- Physics -
**Bob**, Wednesday, November 19, 2008 at 12:16pmI think the first sentence is extra information. Here's my work:

Change in arc/change in radians = 757 / 184.9 = 4.09 meters

To get the change in arc, I did:

900m - 143m = 757 m

To get the change in radians, I did:

70pi radians - 35 radians = 184.9 radians

Is my answer of 4.09 m for the radius correct?

- Physics -
**bobpursley**, Wednesday, November 19, 2008 at 12:48pmThe first sentence is all you need.

arc distance=radius*angleinRadians

2.5=radius(35deg*PIrad/180deg)

radius=4.09 m

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