Question

2. The distance covered in 10 revolutions by a road roller of diameter 4.2 m is
(B) 13.2 m
(C) 264 m
(A) 132 m
(D) 26.4 m​

Answer 1

Answer:

B

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}.C=πd=

7

22

×4.2=13.2 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}.13.2×10=132 m.

Thus, the required distance covered is 132 meters.

Answer 2

Step-by-step explanation:

Revolutions =10

diameter=4.2 ,radius,4.2/2

distance covered in 1 revolution= 2pier

2×22/7×4.2=22×0.6

=13.2

DISTANCE IN 10 REVOLUTIONS =13.2×10

=132

(C) IS CORRECT