1.

The radius of the wheel of a bus is 25 cm.if the speed of the bus is 33 kmph ,then how many revolutions will the wheel make in 1 minute

Answer»
v= 33kmph= 33km/60min
  =11/20 km per min

Circumference of tyre is 
C= 2πr = 2π(25cm)= 2π(25×10-5km)
     =5π×10-4km
                 .......this is distance travelled in one revolution.

no.of rev per min 
= dis travel per min/ dis in one rev
    
 =  (11/20)/(5π×10-4) = 350 rev per min


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