JEE Advanced 2021 Full Test 5 Paper 1

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(One or More than one correct type)
This section contains 06 multiple choice questions. Each question has FOUR options (A), (B), (C) and (D). ONE OR MORE THAN ONE of these four options is(are) correct.

Question : 8 of 54

Marks: +1, -0

A large, horizontal disk of radius R, shown below, starts to rotate from rest with an angular acceleration of α. The rotation is about a vertical axis through the centre of disk. The disk contains a narrow channel of length 2R and rectangular cross-section. Gravity acts in the vertical direction with an acceleration of g. There is a small rectangular puck that just fits easily in the aforementioned channel, as shown. The puck is situated a distance r from the axis of rotation.

If the sides of the channel are frictionless but the bottom of the channel has a static coefficient of friction µ, then puck begins to slide at t=√
µ
α
In case mentioned in option (A), t=√
µg
rα2
Now, instead, the situation is that the bottom of the channel is frictionless but the walls have a static coefficient of friction µ. Now puck begins to slide at t=√
µg
rα2
In case mentioned in option (C), t=√
µ
α

Validate

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