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3. Gravitation
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Q76 of 176 Page 127

If a fresh egg is put into a beaker filled with water, it sinks. On dissolving a lot of salt in the water, the egg begins to rise and then floats. Why?

When a lot of salt is dissolved in water, then the density of salt solution becomes much more than pure water. Due to its much higher density, the salt solution exerts a greater upward buoyant force on the egg making it rise and then float.


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74

A body floats in kerosene of density 0.8 ×103 kg/m3 up to a certain mark. If the same body is placed in water of density 1.0×103 kg/m3, will it sink more or less? Give reason for your answer.

75

Giving reasons state the reading on a spring balance when it is attached to a floating block of wood which weighs 50 g in air.

77

A beaker full of water is suspended from a spring balance. Will the reading of the balance change:

(a) If a cork is placed in water?


(b) If a piece of heavy metal is placed in it?


Give reasons for your answer.

78

When a golf ball is lowered into a measuring cylinder containing water, the water level rises by 30 cm3 when the ball is completely submerged. If the mass of ball in air is 33 g, find its density.

Questions · 176
3. Gravitation
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