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Answer 1

Answer:

Step-by-step explanation:(a) one complete turn means we have to consider the circumference

Therefore 2×pi×r is the circumference of the wheel

=2×3.14×22

=138.16cm

(b) the turns required the wheel make in a journey of 2×pi km =6.28km

n be the no of rotations taken by the wheel

Therefore

n×2pi×r=6.28km

n×138.16×10^-5=6.28

n=4545.4545

n=4545