A wire with a diameter of 1 mm is produced from 66 cubic centimetres of silver. The wire's length in metres will be:
A. 84
B. 90
C. 168
D. 336
Answer:A
A wire with a diameter of 1 mm is produced from 66 cubic centimetres of silver. The wire's length in metres will be:
A. 84 B. 90 C. 168 D. 336
Explanation: The wire's length should be h.1/20 cm = 1/2 mm radius.Then,66 = 22/7 x 1/20 x 1/20 x h,h = 8400 cm = 84 m = 66 x 20 x 20 x 7 /22 = 66 x 20 x 20 x 7 /22 .