Question

13. The radius of a wire is decreased to one-third. If volume remains the same, the
length will become
(a) 3 times
(b) 6 times
(c) 9 times
(d) 27 times​

Answer 1

Answer:

(c) 9 times

Step-by-step explanation:

volume of wire = πr^2h

πr^2h = πr^2/9*9h

since volume is same we will multiply the length by 9 so that 1/9 of radius and 9 of length cancels and gives same volume