Question:
66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:
[A].84
90
168
336
66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:
[A].
[B].
[C].
[D].
Answer: Option A
Explanation:
Let the length of the wire be h.
| Radius = | 1 | mm | = | 1 | cm. | Then, |
| 2 | 20 |
| 22 | x | 1 | x | 1 | x h = 66. | |
| 7 | 20 | 20 |
| h = | 66 x 20 x 20 x 7 | = 8400 cm = 84 m. | ||
| 22 |