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CBSE Class 9 Physics Gravitation (Hard)
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The mass of moon is about 0.012 times that of the earth and its diameter is about 0.25 times that of earth. The value of G on the moon will be:
A stone is released from the top of a tower of height 19.6 m. Then its final velocity just before touching the ground will be:
When a piece of cork is put into the water it starts floating on the surface of water due to the upward buoyant force from water.
If the cork is pushed more inside the water by applying the force than the buoyant force:
Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be:
A boy is whirling a stone tied with a string in a horizontal circular path as shown in the following figure:
If the string breaks the stone:
Following table represents the mass and volume data of the three liquids named A, B, C and D. Can you find which two liquids are identical?
A ball weighing 4 kg of density 4000 kgm-3 is completely immersed in water of density103 kgm-3. What will be the buoyant force acting on it?
An object is put in three liquids having different densities, one by one. The object floats with 1/9, 2/11 and 3/7 parts of its volume outside the surface of liquids of densities d1, d2 and d3 respectively. Which of the following is the correct order of the densities of three liquids?
The school bags are generally provided with the broad strips because:
An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be