Raindrop Terminal Velocity and Force Balance – Rankers Physics
Topic: Solid and Fluids
Subtopic: Surface Tension and Viscosity

Raindrop Terminal Velocity and Force Balance

Assertion (A): A raindrop after falling through some height attains a constant velocity.
Reason (R): At constant velocity the viscous drag plus buoyant force is just equal to its weight.
 
(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)
(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(3) (A) is true but (R) is false
(4) Both (A) and (R) are false

Solution:

Assertion (A) is true, as falling objects in a fluid reach terminal velocity when resistive forces balance gravity.


Reason (R) is true, stating the force balance condition for constant velocity: Weight = viscous drag + buoyant force. (R) correctly explains (A).

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