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:

1232

Diameter of circle = 56 cm

Radius of the wheel r =  \(\frac{56}{2}\)= 28 cm

Circumference of the wheel = 2πr

= 2 × \(\frac{22}{7}\) × 28

= 176 cm

Distance covered by the wheel in 1 revolution = 176 cm

Distance covered by wheel in 7 revolutions = 176 × 7 = 1232 cm

Speed of bus = 1232 cm/sec