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Q.

Find the number of revolutions taken by a wheel of diameter 84 cm to cover 792 m.


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a

300

b

740

c

240

d

500 

answer is A.

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Detailed Solution

It is given that the diameter of the wheel is, d = 84 cm =0.84 m and the distance covered is, D = 792 m.
The circumference of a circle can be expressed as C=2πr   . Here r is the radius of a circle.
Then, the circumference, C is,
Question Image Thus, the number of revolutions, n is,
n= D C ⇒n= 792 2.64 ⇒n=300   
The number of revolutions is 300.
Therefore, the correct option is 1.
 
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Find the number of revolutions taken by a wheel of diameter 84 cm to cover 792 m.