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Physics - Circular Motion Question with Solution | TestHub

PhysicsCircular MotionDynamicsMedium2 minQB

PhysicsMediumassertion reason

Assertion: A bucket of water whirled in a vertical circle just fast enough that at the top the water presses on the bucket with zero force has speed $g R$ at the top.

Reason: At the top of the circle, when the normal reaction is zero, the weight alone provides the centripetal force.

Options:

Answer:

Solution:

With $N = 0$ at the top:
$m g = \frac{m v ^{2}}{R},$
giving $v = g R$ (Assertion true);
the Reason states exactly this force balance, so it explains the Assertion.

Stream:JEESubject:PhysicsTopic:Circular MotionSubtopic:Dynamics

⏱ 2mℹ️ Source: QB

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