Chapter 10 – Gravitation

A sphere of mass M and radius R2 has a concentric cavity of radius R1 as shown in figure The force F exerted by the sphere on a particle of mass m located at a distance r from the centre of sphere varies as (0≤r≤∞) . A body attains a height equal to the radius [...]

If the mass of moon is M/81, where M is the mass of earth, find the distance of the point where gravitational field due to earth and moon cancel each other, from the centre of moon. Given the distance between centres of earth and moon is 60 R where R is the radius of earth [...]

A body attains a height equal to the radius of the earth. The velocity of the body with which it was projected is. A body attains a height equal to the radius of the earth. The velocity of the body with which it was projected is. September 18, 2020 Category: Arihant Physics by D.C Pandey [...]

A planet of mass m moves around the sun of mass M in an elliptical orbit. The maximum and minimum distances of the planet from the sun are r1 and r2 respectively. The time period of the planet is proportional to: Gravitational field at the centre of a semicircle formed by a thin wire AB [...]

A ring of mass m1 and radius R is fixed in space at some location. An external agent brings a point mass m2 from infinity to centre of the ring. Work done by the external agent will be A ring of mass m1 and radius R is fixed in space at some location. An external [...]

A mass m is at a distance a from one end of a uniform rod of length l and mass M. The gravitational force on the mass due to the rod is. A mass m is at a distance a from one end of a uniform rod of length l and mass M. The gravitational [...]

Gravitational field at the centre of a semicircle formed by a thin wire AB of mass M and length l is Gravitational field at the centre of a semicircle formed by a thin wire AB of mass M and length l is September 18, 2020 Category: Arihant Physics by D.C Pandey , Chapter 10 - [...]

Suppose a vertical tunnel is along the diameter of the earth, assumed to be a sphere of uniform mass density ρ. If a body of mass m is thrown in this tunnel, its acceleration at a distance y from the centre is given by: assumed to be a sphere of uniform mass density ρ. If [...]

A particle would take a time t to move down a straight tube from the surface of earth (supposed to be homogeneous sphere) to its centre. If gravity were to remain constant then the time would be t. The ratio t/t ′ will be In the figure shown September 18, 2020 Category: Arihant Physics by [...]

A person brings a mass of 1kg from infinity to a point A. Initially the mass was at rest but it moves at a speed of 2m/s as it reaches A. The work done by a person on the mass is -3J. The potential at A is: In the figure shown September 18, 2020 Category: [...]