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? |
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(a) |
4 |
(b) |
4.5 |
(c) |
24 |
(d) |
None of these |
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 |
Since the weight of the disc is proportional to its area,
We have