Question

(c) The distance covered in 10 rotations by a road roller of diameter 4.2 m is
(i) 132 m
(ii) 13.2 m (iii) 264 m
(iv) 26.4 m​

Answer 1

Answer:

(i) 132 m

Step-by-step explanation:

We know that

Distance covered in 1 revolution =  circumference of the road roller.

Now, diameter of the road roller, d = 4.2 m.

So, the circumference of the road roller is given by

C=\pi d=\dfrac{22}{7}\times4.2=13.2~\textup{m}.

That is,

distance covered in 1 revolution = 13.2 m.

Therefore, distance covered i 10 revolutions is given by

13.2\times10=132~\textup{m}.

Thus, the required distance covered is 132 meters.

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Question : A  particle is moving in a circle of diameter 10 m.What the distance covered it on completing 2 revolutions.