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Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation | Exercise 5C

Question 13

A block of wood is so loaded that it just floats in the water at room temperature. What change will occur in the state of floatation, if

(a) Some salt is added to water,

(b) Water is heated

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(a) It floats with some part outside water.

The density of water increases when salt is added to water, so the upthrust on the block of wood increases, and therefore, the block rises up till the weight of salty water displaced by the submerged part of the block becomes equal to the weight of the block.

(b) It sinks.

The density of water decreases on heating, hence the upthrust on the block decreases, and the weight of the block exceeds the upthrust as a result of which it sinks

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Question 13

A block of wood is so loaded that it just floats in the water at room temperature. What change will occur in the state of floatation, if

(a) Some salt is added to water,

(b) Water is heated

Looking to do well in your science exam ? Learn from an expert tutor. Book a free class!

(a) It floats with some part outside water.

The density of water increases when salt is added to water, so the upthrust on the block of wood increases, and therefore, the block rises up till the weight of salty water displaced by the submerged part of the block becomes equal to the weight of the block.

(b) It sinks.

The density of water decreases on heating, hence the upthrust on the block decreases, and the weight of the block exceeds the upthrust as a result of which it sinks

Our top 5% students will be awarded a special scholarship to Lido.

subject-cta
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