Get Answers to all your Questions

header-bg qa

A plate of area 100cm2 is lying on the upper surface of a 2mm thick oil film. If coefficient of viscosity of oil is 15.5 poise then horizontal force (in N) required to move the plate with a velocity of 3cm/s will be 

Option: 1

0.2325


Option: 2

2.325


Option: 3

23.25


Option: 4

232.5


Answers (1)

best_answer

As we learned 

 

Viscous Force -

F=-\eta A \frac{dv}{dx}

- wherein

A -Area

F -Viscous force

v -Velocity\: of \: liquid

x\ -\ Distance\ from\ refrence\ point 

Negative sign shows viscous force acts opposite to flow of liquid

 

 \eta =15.5\: poise=1.55\: S.I\: unit\left ( Pa-s \right )

\therefore F=\eta A\frac{dv}{dx}=1.55\times 10^{-2}\times \frac{3\times 10^{-2}}{2\times 10^{-3}}

=0.2325N

 

Posted by

Deependra Verma

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE