Question

How many revolutions will the wheel of a bicycle make to cover 4.4 km . if its diameter is 70 cm

Answer 1

Circumference of the wheel=2πr
=2×22/7×70/2=220 cm²
Distance to be cover by the wheel=4.4 km=440000 cm
No.of revolutions the wheel will make=220×440000
=96800000(Ans.)

Answer 2

heya!

here's ur answer...

$given \: diameter \: of \: the \: wheel \: is \: 70cm \\ therfore \: its \: radius \: is = \frac{70}{2} = 35cm \\ \\ circumference \: of \: the \: wheel = 2\pi \: r \\ = 2 \times \frac{22}{7} \times 35 \\ = 44 \times 5 \\ = 220cm \\ \\ in \: kms = \frac{220}{100000} \\ \\ = 0.0022km \\ \\ hence \: number \: of \: revolutions \: to \: cover \: \\ 4.4km = \frac{4.4}{0.0022} \\ \\ = 2000 \\ \\ it \: will \: take \: 2000\:revolutions \\ \\ hope \: this \: helps....$

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