A piece of iron sinks in water but a ship made of iron floats in water.

The hollow space of the ship is filled by air. Hence it reduces the average density of the ship to lower than that of water. Therefore, since the density of the ship is less than that of water, it floats in the water. However, a piece of iron sinks because it doesn't has air filled inside it.

2nd Explanation-

The density of iron is more than the density of water therefore the weight of the nail is more than the upthrust experienced by it causing it to sink. However a ship although much larger than the nail floats because the ship is hollow from inside and this space is filled with air which reduces the average density of the ship lower than that of water. Thus even with a small portion of the ship submerged under water, the weight of the water displaced by it becomes equal to the weight of the entire ship.

Explanation:

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potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

when cloud cover increases then the suns ray's which provides the earth with light and warmth gets covered due to the due to the suns ray's being blocked, the temperature in that region

therefore to conclude i would like to say that,

=more the cloud cover, the lesser the

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