Question

Which has the highest weight?

• A. $1m^3$ of water
• B. A normal adult man
• C. $10L$ of $Hg$
• D. All have same weight

Answer 1

Answer: (A)

(a) Density of water $=1gc{m}^{-3}$
Mass of water $=1m^3=10^{6}c{m}^{-3}$
Mass $=$ volume $\times$ density
$=10^{6}c{m}^{-3}\times 1gc{m}^{-3}$
$=10^{6}g=\frac{10^6}{10^3}kg$
$=1000kg$
(b) Mass of normal adult man $=65kg$
(c) Density of $Hg=13.6gc{m}^{-3}$
Volume of $Hg=10L=10\times 1000c{m}^{-3}$
$\therefore$ Mass of $Hg=13.6\times 10\times 1000$
$=136000g$
$=13.6kg$
$\therefore$ Mass of $1m^3$ water is highest.