Laws Of Motion Question 239

Question: If in a stationary lift, a man is standing with a bucket full of water, having a hole at its bottom. The rate of flow of water through this hole is $ R _{0}. $ If the lift starts to move up and down with same acceleration and then that rates of flow of water are $ R _{u} $ and $ R _{d}, $ then [UPSEAT 2003]

Options:

A) $ R _{0}>R _{u}>R _{d} $

B) $ R _{u}>R _{0}>R _{d} $

C) $ R _{d}>R _{0}>R _{u} $

D) $ R _{u}>R _{d}>R _{0} $

Show Answer

Answer:

Correct Answer: B

Solution:

Rate of flow will be more when lift will move in upward direction with some acceleration because the net downward pull will be more and vice-versa. $ {F _{upward}}=m(g+a) $ and $ {F _{downward}}=m(g-a) $



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