How far does a wheel of 7m radius travel in one revolution?
- 14m
- 22m
- 44m
Explanation from PART66Online
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.
K
kufu asked · 31 Jan 2013
2 pgreck r=14pgrek. So is 43.96!!!!
Community Comments (4)
P
PART66Online
31 Jan 2013
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
13 Apr 2016
can you show me workings plse.
S
supermas93
13 Apr 2016
It's rounded up...
P
PART66Online
13 Apr 2016
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)
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