If a wheel of radius R revolves 1/2 a turn, how many radians does it turn through?
- 2pi radians
- 2R^2 radians
- pi radians
Explanation
A full revolution of a circle is 2*pi radians, so one half turn is half of that, which equals pi radians. The radius R does not affect the angle swept; it only affects the linear distance the rim travels, so options involving R are incorrect.
sherrykhan asking:
im not understanding this question
Community Comments (3)
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dimky Posts: 514 23.01.2012 / 17:41
Hello.
360 degrees (1 wheel turn) = 2π radians, so 1/2 of turn is π radians.
http://en.wikipedia.org/wiki/Radian
360 degrees (1 wheel turn) = 2π radians, so 1/2 of turn is π radians.
http://en.wikipedia.org/wiki/Radian
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davidjameswatson1991@live.co.uk Posts: 4 21.09.2014 / 18:49
yeah dimky has got it spot on 2pi radians is for a complete circle so its pi radians for a half circle!
A
aerorodder1 Posts: 20 19.12.2015 / 09:54
π=~22/7 or ~3.14159265359.…
22/7×2= 6.28π Radians, or 2π, or 360° 3.14159265359×2= 6.28π
√2+√3= ~π
22/7×2= 6.28π Radians, or 2π, or 360° 3.14159265359×2= 6.28π
√2+√3= ~π
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