Arihant Physics by D.C Pandey

The change in the gravitational potential energy when a body of a mass m is raised to a height nR above the surface of the earth is (here R is the radius of the earth) The change in the gravitational potential energy when a body of a mass m is raised to a height nR [...]

The escape velocity for the earth is ve. The escape velocity for a planet whose radius is 1/4th the radius of the earth and mass half that of the earth is : The escape velocity for the earth is ve. The escape velocity for a planet whose radius is 1/4th the radius of the earth [...]

A particle is fired with a speed of 20 km/h. €The speed with which it will move in interstellar space is (ve = 8 root 2 km/h) A particle is fired with a speed of 20 km/h. €The speed with which it will move in interstellar space is (ve = 8 root 2 km/h) September [...]

Two planets A and B have the same material density. If the radius of A is twice that of B, then the ratio of the escape velocity Va/Vb then the ratio of the escape velocity Va/Vb Two planets A and B have the same material density. If the radius of A is twice that of [...]

The ratio of the acceleration due to gravity as the bottom of a deep mine and that on the surface of the earth is 978/980. Find the depth of the mine, if the density of the earth is uniform throughout and the radius of the earth is 6300 km. if the density of the earth [...]

A planet has same density and same acceleration due to gravity as of earth and universal gravitational constant G is twice of earth. The ratio of their radii is A planet has same density and same acceleration due to gravity as of earth and universal gravitational constant G is twice of earth. The ratio of [...]

The mass of the moon is 81/1 of the earth but the gravitational pull is 6/1 of the earth. It is due to the fact that The mass of the moon is 81/1 of the earth but the gravitational pull is 6/1 of the earth. It is due to the fact that September 18, 2020 [...]

The height of a point vertically above the earth’s surface at which the acceleration due to gravity becomes 1% of its value at the surface is (Given, R= radius of earth) R= radius of earth) The height of a point vertically above the earth's surface at which the acceleration due to gravity becomes 1% of [...]

Assertion : On earth’s satellite, we feel weightlessness. Moon is also satellite of earth. But on the surface on moon, we do not feel weightlessness Reason : Gravitational force by earth on us on the surface of moon is zero. But gravitational force by moon on us on its surface is non-zero. Assertion : On [...]

Assertion : Let W1 be the work done in taking away a satellite from the surface of earth to its orbit and then W2 the work done in rotating the satellite in circular orbit there. Then, W1=W2 Reason : W2=GMm/2R Assertion : Let W1 be the work done in taking away a satellite from the [...]