Question bank/JEE Main/Physics

A container filled with viscous liquid is moving vertically
downwards with constant speed
[IMAGE]. At the instant shown, a sphere of radius
r is moving vertically downwards (in liquid) has speed
[IMAGE]. The coefficient of viscosity is η. There is no relative motion between
the liquid and the container. Then at the shown instant, the magnitude
of viscous force acting on sphere is[IMAGE]. Find x.,d ik=k tks fd,d pky 3v_0ls
f= xksyk uhps dh rjQ (nzo esa) tk jgk gS mlds xksys dh
ugh gSA rks bl.k ij xksys ij cy

Your answerCheck answer

Show answer and solution▾

Relative to liquid, the velocity of sphere is
[IMAGE] viscous force on sphere
$= 12\pi\eta\text{r}\text{v}_{0}$downward
nzo xksys dk osx dh rjQ gSA
$\therefore$xksys ij nzo = 6 πη r2v_0uhps

Source: Grass-G / Ph-27 Physics paper 2 15 Jan.docx