Physics-
General
Easy
Question
A cylinder rests in a supporting carriage as shown. The side AB of carriage makes an angle 
with the horizontal and side BC is vertical. The carriage lies on a fixed horizontal surface and is being pulled towards left with an horizontal acceleration 'a'. The magnitude of normal reactions exerted by sides AB and BC of carriage on the cylinder be 
respectively. Neglect friction everywhere. Then as the magnitude of acceleration 'a ' of the carriage is increased, pick up the correct statement:
increases and 
decreases
- Both and increase
- remains constant and increases
- increases and remains constant
increases and decreases
and increase
remains constant and increases
increases and remains constant
The correct answer is: remains constant and increases
The free body diagram of cylinder is as shown. Since net acceleration of cylinder is horizontal
and NBC – NAB sin30° = ma or NBC = ma + NAB sin 30° .... (2)
Hence NAB remains constant and NBC increases with increase in a.
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