JEE Main & Advanced
Physics
Rotational Motion
JEE PYQ-Rotational Motion
question_answer
A long cylindrical vessel is half filled with a liquid. When the vessel is rotated about its own vertical axis, the liquid rises up near the wall. If the radius of vessel is 5 cm and its rotational speed is 2 rotations per second, then the difference in the heights between the centre and the sides, in cm, will be- [JEE Main 12-Jan-2019 Evening]
A) 0.4
B) 2.0
C) 0.1
D) 1.2
Correct Answer:
D
Solution :
[b] The linear speed of the liquid at the sides is . So, the difference in height is given as follows: