Question

Q. 30 (i) A steel needle sinks in water but a steel ship floats. Explain, how?
(ii) Why do you prefer a broad and thick handle of your suitcase ?​

Answer 1

Answer:

I) this is because a ship has a larger surface are and thus experiences a larger buoyant force also it has hollow part with air which further help.

2)a broader handle since then the pressure exerted on the hand is much less as compared to thinner handle.

Answer 2

Explanation:

I. A steel needle had greater surface area as compare to ship and this maintains balance and pressure on the surface of water.

ii. As the surface area deacrese, pressure increases . we prefer a broad and thick handle in suitcase so that the less pressure applied by handle on our palm and it will easy to carry .