Discussion of Question with ID = 050 under Volume-and-Surface-Areas

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Question

What is the length of a 10 mm wire that has been drawn out of a lump of 77 cu. cm. tin? Take π = 22/7.

A

2450 cm.

B

2452 cm.

C

2448 cm.

D

2454 cm.

Soln.
Ans: a

The wire is a cylinder with r = 1/10 cm, and length L. The volume of tin is equal to the volume of the wire. So π ${1/10} × {1/10} × L$ = 77, which gives L = ${10 × 10 × 77 × 7}/22$ = 2450 cm.


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