Question

A thin wire has a length of $21.7cm$ and radius $0.46mm$. The volume of the wire to correct significant figures is :

• A. $1.4{cm}^3$
• B. $0.14{cm}^3$
• C. $0.14{mm}^3$
• D. None of these

Answer 1

The correct option is B $0.14{cm}^3$

Given : $L=21.7cm,r=0.46mm=0.046cm$
Volume of wire, $V=\pi r^{2}l$
$=\frac{22}{7}{\left(0.046\right)}^2\left(21.7\right)$
$=0.1443c{m}^3=0.14c{m}^3$