Question

a wheel of diameter in 14 cm makes 3000 revolution per min find speed in m/sec.?

Answer 1

Speed = (Distance covered) / Time Taken

Revolutions per minute = 3000 / 60 = 50 revolutions per second
Distance covered in one revolution = Circumference of wheel
= 2πr
= (2 * 22 * 7)/7
= 44 cm = 44/100 = 0.44m
Total distance covered in a second = 0.44 * 50 = 22 meter in a second
so the speed is 22 m/sec

Answer 2

Speed = (Distance covered) / Time Taken ;
                    1 revolution = 2*pi*r
                                       =44/7*7
                                      =44cm
           for 3000 revolution =44*3000
                                           132000cm
                 its given that for 1 min =132000
                                               60 seconds=132000cm
                                                    speed = 132000/60
                                                              2200m/s