Properties of Matter 2 Question 4
4. A wooden block, with a coin placed on its top, floats in water as shown in figure. The distance $l$ and $h$ are shown there. After sometime the coin falls into the water. Then $(2002,2 M)$
(a) $l$ decreases and $h$ increases
(b) $l$ increases and $h$ decreases
(c) Both $l$ and $h$ increase
(d) Both $l$ and $h$ decrease
Show Answer
Answer:
Correct Answer: 4. (d)
Solution:
- $l$ will decrease, because the block moves up and $h$ will decrease, because the coin will displace the volume of water $\left(V _1\right)$ equal to its own volume when it is in the water whereas when it is on the block it will displace the volume of water $\left(V _2\right)$ whose weight is equal to weight of coin and since density of coin is greater than the density of water, $V _1<V _2$.
