the diameter of front and rear wheels of a tractor are 21 cm and 84 cm . find the number of revolutions that rear wheel make to cover the distance which front wheel covers in 20sec at a speed of 252 km /h
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the diameters of and rear wheel of tractor are 21cm and 84cm then front wheel is smaller than back wheel so, it is 21cm
radius =d÷2=21÷2
=10.5cm
circumference=2×22÷7×r
=2×22÷7×10.5
=66cm
2nd part
252÷5÷18=28m/s
since 28×20=560m
then numbers of revolution=560×100÷66=849
radius =d÷2=21÷2
=10.5cm
circumference=2×22÷7×r
=2×22÷7×10.5
=66cm
2nd part
252÷5÷18=28m/s
since 28×20=560m
then numbers of revolution=560×100÷66=849
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