Reading of spring balance when a block is suspended from it in air, is 60,N . This reading is change

English

Gujarati

Hindi

9-1.Fluid Mechanics

medium

The reading of spring balance when a block is suspended from it in air, is $60\,N$. This reading is changed to $40\, N$ when the block is immersed in water. The specific density of the block is

A

$3$

B

$\frac{2}{3}$

C

$6$

D

$\frac{3}{2}$

Solution

${W_{app}} = {W_{actual}}\,\left( {1 – \frac{{{\rho _L}}}{{{\rho _s}}}} \right)$

$\Rightarrow 40=60\left(1-\frac{1}{\rho_{\mathrm{s}}}\right)$

$\Rightarrow \rho_{s}=3$

Standard 11

Physics

Share

Similar Questions

A block of ice floats on a liquid of density $1.2$ in a beaker then level of liquid when ice completely melt

medium

(IIT-1994)

A sample of metal weighs $210 gm$ in air, $180 gm$ in water and $120 gm$ in liquid. Then relative density $(RD) $ of

hard

A cube of edge length $10 \,cm$ is just balanced at the interface of two liquids $A$ and $B$ as shown in figure. If $A$ and $B$ has specific gravity $0.6$ and $0.4$ respectively, then mass of cube is ……………. $g$

medium

Water coming out of a horizontal tube at a speed ? strikes normally a vertically wall close to the mouth of the tube and falls down vertically after impact. When the speed of water is increased to $2v$ .

medium

There is a metal cube inside a block of ice which is floating on the surface of water. The ice melts completely and metal falls in the water. Water level in the container

medium