1.

A Boy Is Cycling Such That The Wheel Of The Cycle Are Making 420 Revolutions Per Minute. If The Diameter Of The Wheel Is 50 Cm, Find The Speed Of The Boy.

Answer»

Diameter = 50 CM hence radius(R) = 50/2 cm

THEREFORE; Circumference of cycle = 2*22/7*r

As number of revolutions per minute = 420

Therefore; Speed = 2*(22/7) *[25/(100*1000)]*60*420 km/hr

= 396/10 km/hr

= 39.6 km/hr.

Diameter = 50 cm hence radius(r) = 50/2 cm

Therefore; Circumference of cycle = 2*22/7*r

As number of revolutions per minute = 420

Therefore; Speed = 2*(22/7) *[25/(100*1000)]*60*420 km/hr

= 396/10 km/hr

= 39.6 km/hr.



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