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प्रश्न
A balloon filled with hydrogen rises in air. Explain the reason.
उत्तर
Hydrogen's density and weight is less than that of air. A balloon filled with hydrogen rises to a certain height as it displaces more weight of air than the weight of balloon but as it rises higher density of air decreases and upthrust becomes less and ultimately upthrust becomes equal to the weight of balloon and balloon stops rising further.
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संबंधित प्रश्न
Arrange the following substances in order of their increasing density:
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(a) mass, (b) volume and (c) density
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The density of air is 1.28 g/Iitre. Express it in kg m-3
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State true or false. If false, correct the statement.
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Two spheres of same size are made from copper and iron respectively. Find the ratio between their masses (Density of copper is 8,900 kg/m and iron is 7,800 kg/m3 ).
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Questions based on Higher Order Thinking Skills:
There are three spheres A, B, C as shown below. Sphere A and B are made of same material. Sphere C is made of a different material. Spheres A and C have equal radii. The radius of sphere B is half that of A. Density of A is double that of C.
Now answer the following questions.
- Find the ratio of masses of spheres A and B.
- Find the ratio of volumes of spheres A and B.
- Find the ratio of masses of spheres A and C.
