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

• A. $R _ { 0 } > R _ { u } > R _ { d }$
• B. $R _ { u } > R _ { 0 } > R _ { d }$
• C. $R _ { d } > R _ { 0 } > R _ { u }$
• D. $R _ { u } > R _ { d } > R _ { 0 }$

Answer 1

Answer: (B)

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

Answer 2

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.

$F _ { \text {upward } } = m ( g + a )$ and $F _ { \text {downward } } = m ( g - a )$