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Explain why when a person stands on a cu...

Explain why when a person stands on a cushion , the depression is much more than when he lies down on it .

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LAKHMIR SINGH & MANJIT KAUR-GRAVITATION-Exercise
  1. Explain why ,the tip of a sewing neddis is sharp.

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  2. Why is the pressure on the ground more when a man is walking than when...

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  3. Explain why when a person stands on a cushion , the depression is much...

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  4. Use your ideas about pressure to explain why it is easier to walk on s...

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  5. Explain why,a nail has a pointed tip .

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  6. Explain why, building and dams have wide foundations.

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  7. Why do camels have large flat feet ?

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  8. A pressure of 10 Pa acts on an area of 3.0 m^(2) .What is the force ac...

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  9. Calculate the density of an object of volume 3 m ^(3) and mass 9 kg .S...

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  10. (a) Write down an equation that defines density . (b) 5 kg of meteri...

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  11. Define density .What is the SI unit of density ? (b) Define relati...

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  12. (a) Define pressure . ( b) What is the relation between pressure for...

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  13. (a) How does a boat float in water ? A piece of steel has a volume ...

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  14. An object weighs 10N in air. When immersed fully in liquid, it weighs ...

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  15. The diagrams represent four measuring cylinders containing liquids. Th...

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  16. Consider the following information in respect of four objects A, B, C,...

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  17. If two equal weights of unequal volumes are balanced in air, what will...

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  18. Two different object are completely immersed in water and undergo same...

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  19. State the universal law of gravitation.

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  20. Write the formula to find the magnitude of the gravitational force bet...

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