Q.
A wooden black, with a coin placed on its top, flats in water as shown in the figure. The distance $h\ and\ l\ $are shown there. After sometime, the coin falls into the water, then
A) $both\ land\ h\ increace$
B) $both\ l\ and\ h\ decrese$
C) $l$ decrease and $h$ increase
D) $l\ increase\ and\ h\ decrease$
Explanation
(b) $l$ Will decreases because the block moves up. $h$ will decreases because the coin will displace the volume $(V_{1})$ of water equal to its own volume when it is in water whereas when it is on the block it will displace the volume of water $(V_{2})$ whose weight is equal to weight of coin and science density of coin is greater than the density of water,
$\therefore\ \ V_{1} < V_{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.