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Now this sector with central angle  ,
folded into a right circular cone. Note that the circumference ofthe
base of the cone = length of arc ACB (s).
Let 'r' be the radius of the base of the cone then circumference
= 2 p r
14. Find the diameter of a pulley which is driven
at 360 revolution per minute by a belt moving at 44cm/sec.
Solution
The given pulley is driven at 360 revolution per minute.
\ It is driven at 6 revolution per
sec.
Let `r' be the radius of the pulley, then its circumference
= 2 p r
The belt is around the pulley, therefore in one revolution the
length of the belt unwound is 2pr.
\ length of the belt unwound in 6 revolutions
= 6 ´ 2pr
= 12p r
15. A truck travelling at 60 km/hr. has front wheels
of radius 2m. Compute their angular speed in radians/sec.
Solution
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