Question

why does an iron needle sink in water, but not an iron ship? anyone know the answer.

Answer 1

Dear Student!!

Since the ship is designed in such a way that its effective density (m/V) is less than the density of the water.

V = volume of ship

m =mass of ship.

So it floats upon the water. Hence the ship does not sink.

For the iron needle,

The density of needle (as of iron) is much larger than the water. So it sinks easily.