First slide

Viscous flow/Laminar flow

Question

A solid sphere falls with a terminal velocity of 20 ms^-1 in air. If it is allowed to fall in vacuum,

Easy

A

terminal velocity will be 20 m s^-1
B

terminal velocity will be less than 20 m s^-1
C

terminal velocity will be greater than 20 m s^-1
D

no terminal velocity will be attained

Solution

As in vacuum, there is no viscosity, no resistive force and hence no terminal velocity can be acquired.

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