speed of the car is 47.52 km/hr. a lorry wheel is rotating at 400 RPM. what is radius (in cm) of a lorry wheel has a same speed with the car.
400rev/min * 60min/h = 24,000 rev/h.
Circumference(C) = 47,520m/24,000rev =
1.98 m/rev
C = pi*2r = 1.98 m
6.28r = 1.98
r = 0.315 m = 31.5 cm = Radius of the
wheels.