Momentum and CollisionHard
Question
A space 2.5 cm wide between two large plane surface is filled is filled with oil. Force required to drag a very thin plate of area 0.5 m2 just midway the surface at a speed of 0.5 m/s is 1N. The coefficient of viscosity in kg-sec/m2 is :
Options
A.5 × 10-2
B.2.5 × 10-2
C.1 × 10-2
D.7.5 × 10-2
Solution
Net viscous force
= 2Fv = 2ηA
∴ F = 1N ⇒ 1 = 2η × (0.5) ×
⇒ η = 2.5 × 10-2 kg-s/m2
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