Class 11

Science

Physics

Gravitation

From a solid sphere of mass M and radius R, a spherical portion of radius R/2 is removed, as shown in the figure Taking gravitational potential $V=0atr=∞$, the potential at (G = gravitational constatn)

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A satellite moves around the earth in a circular orbit with speed $v$. If $m$ is the mass of the satellite, its total energy is

Buoyant force exerted by a fluid on a given body is :

Archimedes' major contribution / discovery was:

Which of the following is an application of Archimedes' principle?

Two spherical bodies of masses $m$ and $4m$ and radii R and 2R respectively are released in free space with initial separation between their centres equal to 15 R. If they attract each other due to gravitational force only, then the distance covered by smaller sphere just before collision will be

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 ?

Assuming earth to be a sphere of uniform mass density, how much would a body wrigh galf way down the centre of rhe centre of the earth , if it weighed 100 N on the surface?

If both the mass and radius of the earth, each decreases by 50%, the acceleration due to gravity would