Question

A body of density $d _ { 2 }$ in air of density d. Then the true mass of the body is

• A. M
• B. $M \left( 1 - \frac { d } { d _ { 2 } } \right)$
• C. $M \left( 1 - \frac { d } { d _ { 1 } } \right)$
• D. $\frac { M \left( 1 - d / d _ { 2 } \right) } { \left( 1 - d / d _ { 1 } \right) }$

Answer 1

Answer: (D)

$\frac { M \left( 1 - d / d _ { 2 } \right) } { \left( 1 - d / d _ { 1 } \right) }$

Answer 2

Let $M _ { 0 } =$mass of body in vacuum.

Apparent weight of the body in air = Apparent weight of

standard weights in air

$\Rightarrow$ Actual weight – upthrust due to displaced air = Actual

weight – upthrust due to displaced air

$\Rightarrow$

.