The radius of a wheel of a bus is 0.70m. How many revolutions will it make in covering 22 km.

Asked by siddharth | 1st Mar, 2015, 02:31: PM

Expert Answer:

G i v e n space t h a t space t h e space r a d i u s space o f space t h e space w h e e l space o f space a space b u s comma space r equals space 0.70 space m W e space n e e d space t o space f i n d space t h e space n u m b e r space r e v o l u t i o n s space i t space m a k e space i n space c o v e r i n g space 22 space k m. W e space k n o w space t h a t space t h e space c i r c u m f e r e n c e space o f space a space c i r c l comma space w i t h space r a d i u s space r equals 2 πr Thus space the space cirumference space of space the space wheel equals 2 cross times 22 over 7 cross times 0.7 equals 4.4 space straight m Therefore comma space the space wheel space covers space 4.4 space straight m space in space one space revolution. That space is comma space it space makes space one space revolution space in space covering space 4.4 space straight m We space know space that space 1 space km space equals 1000 space straight m It space is space given space that space it space covers space 22 space km equals 22 cross times 1000 space straight m equals 22000 space straight m Thus space the space number space of space revolutions space it space make space in space covering space 22000 space straight m equals fraction numerator 1 over denominator 4.4 end fraction cross times 22000 equals 5000

Answered by Vimala Ramamurthy | 1st Mar, 2015, 05:48: PM

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