Class 9

Science

Physics

Gravitation

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

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On what principle does the submarines based?

Buoyant force acting on an object is equal to the ___

Archimedes' principle states that when a body is totally or partially immersed in a fluid. the up thrust is equal to:

A stone is allowed to fall from the top of a tower $100$m high and at the same time another stone is projected vertically upwards from the ground with a velocity of $25m/s$. Calculate when and where the two stones will meet.

A body weighs $63$N on the surface of the earth. What is the gravitational force (in N) on it due to the earth at a height equal to half the radius of the earth ?

Two spherical bodies of mass M and 5M & radii R & 2R respectively are released in free space with initial separation between their centres equal to 12R. If they attract each other due to gravitational force only, then the distance covered by the smallar body just before collision is

Consider the following two statements and identify the correct choice.A: When a body floats in a liquid, it displaces the liquid whose weight is equal to its own weight.B: When a body sinks in a liquid, it displaces the liquid whose volume is equal to its own volume.

Construction of submarines is based on