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A small disc of radius r is cut out from a disc of radius R. The weight of the disc which now has a hole in it, it reduced to   of the original weight. If R = xr, what is the valve of x?  

(a)

4

(b)

4.5

(c)

24

(d)

None of these



Question ID - 50603 | SaraNextGen Top Answer

A small disc of radius r is cut out from a disc of radius R. The weight of the disc which now has a hole in it, it reduced to   of the original weight. If R = xr, what is the valve of x?  

(a)

4

(b)

4.5

(c)

24

(d)

None of these

1 Answer
127 votes
Answer Key / Explanation : (d) -

Since the weight of the disc is proportional to its area,

We have

127 votes


127