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CBSE Class 10 Answered

1) A bicycle wheel makes 5000 revolutions in moving 10km. find the radius of the wheel. 2) IF THE PERIMETER OF A SEMI CIRCULAR PROTRACTER IS 108 CM,FIND THE RADIUS OF THE PERIMETER.  
Asked by rpradeepvangal | 02 Dec, 2018, 07:30: AM
answered-by-expert Expert Answer
Only one question per posting will be answered. Hence only first question is answered.
 
distance covered by 5000 revolutions = 10 km - 10000 m
hence distance covered by one revolution = 10000 / 5000 = 2 m
circumference of wheel = 2πr = 2m =200 cm
where r is radius of wheel
 
radius = 200 /(2π) ≈ 32 cm
Answered by Thiyagarajan K | 02 Dec, 2018, 09:07: AM

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