A tall cylinder is filled with viscous oil. A round pebble is dropped from the top with zero initial velocity. From the plot shown in figure, indicate the one that represents the velocity `(v)` of the pebble as a function of time `(t)`A. B. C. D.

A tall cylinder is filled with viscous oil. A round pebble is dropped

1.	A tall cylinder is filled with viscous oil. A round pebble is dropped from the top with zero initial velocity. From the plot shown in figure, indicate the one that represents the velocity `(v)` of the pebble as a function of time `(t)`A. B. C. D.
Answer» Correct Answer - C When the pebble is falling throught the viscous oil the viscous force is `F=6pietarv` where r is radius of the pebble, v is instantaneous speed, `eta` is coefficient of viscosity. As the force is variable , hence accleration is also variable so v-t graph will not be straight line. First velocity increases and then becomes constant known as terminal velocity.

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A tall cylinder is filled with viscous oil. A round pebble is dropped from the top with zero initial velocity. From the plot shown in figure, indicate the one that represents the velocity `(v)` of the pebble as a function of time `(t)`A. B. C. D.

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