How far does a wheel of 7m radius travel in one revolution?
- 14m
- 22m
- 44m
Explanation
Distance per revolution equals the circumference, 2*pi*r. Using pi as 22/7, this is 2 * (22/7) * 7 = 44 metres. The 22m option mistakenly uses the radius once, and 14m simply doubles the radius without applying pi at all.
kufu asking:
2 pgreck r=14pgrek. So is 43.96!!!!
Community Comments (4)
D
dimky Posts: 514 31.01.2013 / 19:41
Hello.
You should select most correct answer.
You calculated this answer using calculator, but on exam you can't use it so you must calculate in your head or on paper. In questions like that answers probably will be not very precise.
You should select most correct answer.
You calculated this answer using calculator, but on exam you can't use it so you must calculate in your head or on paper. In questions like that answers probably will be not very precise.
R
ritchiekitch78 Posts: 1 13.04.2016 / 11:19
can you show me workings plse.
S
supermas93 Posts: 3 13.04.2016 / 11:58
It's rounded up...
D
dimky Posts: 514 13.04.2016 / 17:21
ritchiekitch78, formula for travel of one revolution: D * pi
In this case we have radius 7m, so D = 7 * 2 = 14.
Then 14 * pi = 14 * 3.14 = 44 (approx)
In this case we have radius 7m, so D = 7 * 2 = 14.
Then 14 * pi = 14 * 3.14 = 44 (approx)
Please Sign In to post a comment.