Question 62

Each wheel of a bus is making 7 revolutions per second. If the diameter of a wheel is 56 cm, then the speed of the bus (in cm/sec) would be:

Solution

If the diameter of a wheel is 56 cm.

the radius of a wheel = $$\frac{56}{2}$$ = 28 cm

the perimeter of a wheel = $$2\times\ \pi\ \times\ radius$$

= $$2\times\frac{22}{7}\ \times\ 28$$
= $$2\times22\times4$$

= 176 cm

Each wheel of a bus is making 7 revolutions per second.

speed of the bus = $$7\times176$$ = 1232 cm/sec

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